H. Y. Hwang group

H. K. Sato, C. Bell, Y. Hikita and H. Y. Hwang, arxiv:1304.7830.

Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

M. Sakano, M. S. Bahramy, A. Katayama, T. Shimojima, H. Murakawa, Y. Kaneko, W. Malaeb, S. Shin, K. Ono, H. Kumigashira, R. Arita, N. Nagaosa, H. Y. Hwang, Y. Tokura, and K. Ishizaka, Phys. Rev. Lett. 110, 107204 (2013).

Hot electron transport in a strongly correlated transition-metal oxide

K. G. Rana, T. Yajima, S. Parui, A. F. Kemper, T. P. Devereaux, Y. Hikita, H. Y. Hwang, and T. Banerjee, Scientific Reports 3, 1274, (2013).

Photoconductivity and non-exponential relaxation at insulating LaAlO₃/SrTiO₃ interfaces

M. Kim, C. Bell, Y. Hikita, Y. Kozuka, B. G. Kim and H. Y. Hwang, submitted.

Compositional and Gate Tuning of the Interfacial Conductivity in LaAlO₃/LaTiO₃/SrTiO₃ Heterostructures

M. Hosoda, C. Bell, Y. Hikita and H. Y. Hwang, Appl. Phys. Lett. 102, 091601 (2013).

Coexistence of two- and three-dimensional Shubnikov-de Haas oscillations in Ar⁺ -irradiated KTaO₃

S. Harashima, C. Bell, M. Kim, T. Yajima, Y. Hikita, and H. Y. Hwang, submitted.

2012

Effect of anisotropic strain on the charge dynamics of Nd_0.5Sr_0.5MnO₃ thin films

P. Munkhbaatar, N. Nakagawa, H. Y. Hwang, J. S. Kim and K. Myung-Whun, Solid State Commun. 152, 1541 (2012).

Metal-to-insulator transition in anatase TiO₂ thin films induced by growth rate modulation

T. Tachikawa, M. Minohara, Y. Nakanishi, Y. Hikita, M. Yoshita, H . Akiyama, C. Bell, and H. Y. Hwang, Appl. Phys. Lett. 101, 022104, (2012).

Scanning probe manipulation of nanomagnetism at the LaAlO₃/SrTiO₃ heterointerface

B. Kalisky, J. Bert, C. Bell, Y. Xie, H. Sato, M. Hosoda, Y. Hikita, H. Y. Hwang and K. A. Moler, Nano Letters, 12, 4055-4059 (2012).

Magnetotransport effects in polar versus non-polar SrTiO₃ based heterostructures

E. Flekser, M. Ben Shalom, M. Kim, C. Bell, Y. Hikita, H. Y. Hwang, and Y. Dagan, Phys. Rev. B, 121104(R)(2012) .

Gate-tuned superfluid density at the superconducting LaAlO₃/SrTiO₃ interface

J. A. Bert, Katja C. Nowack, B Kalisky, H Noad, J. R. Kirtley, C. Bell, H. Sato, M. Hosoda, Y. Hikita, H. Y. Hwang and K. A. Moler, Phys. Rev. B 86, 060503(R) (2012).

Scanning SQUID susceptometry of a paramagnetic superconductor

J. R. Kirtley, B. Kalisky, J. A. Bert, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, J. H. Ngai, Y. Segal, F. J. Walker, C. H. Ahn, and K. A. Moler, Phys. Rev. B 85, 224518 (2012)

Shubnikov-de Haas Oscillations in the Bulk Rashba Semiconductor BiTeI

C. Bell, M. S. Bahramy, H. Murakawa, J. G. Checkelsky, R. Arita, Y. Kaneko, Y. Onose, M. Tokunaga, Y. Kohama, N. Nagaosa, Y. Tokura, and H. Y. Hwang, Phys. Rev. B 87, 081109(R) (2013).

Critical Thickness for Ferromagnetism in LaAlO₃/SrTiO₃ Heterostructures

B. Kalisky, J. A. Bert, B. B. Klopfer, C. Bell, H. K. Sato, M. Hosoda, Y. Hikita, H. Y. Hwang, and K. A. Moler, Nat. Commun. 3, 922, (2012).

Emergent Phenomena at Oxide Interfaces

H. Y. Hwang, Y. Iwasa, M. Kawasaki, B. Keimer, N. Nagaosa, and Y. Tokura, Nature Materials 11, 103-113 (2012).

Controlling Band Alignments by Engineering Interface Dipoles at Oxide Heterointerfaces

T. Yajima, Y. Hikita, M. Minohara, C. Bell, H. Kumigashira, M. Oshima, and H. Y. Hwang, Photon Factory News Vol.29, No.4 (2012), (invited, in press).

Single-Valley Quantum Hall Ferromagnet in a Dilute Mg_xZn_1-xO/ZnO Two-Dimensional Electron System

Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and M. Kawasaki, Phys. Rev. B 85, 075302 (2012).

Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO₃.

P. D. C. King, R. H. He, T. Eknapakul, S.-K. Mo, Y. Kaneko, S. Harashima, Y. Hikita, M. S. Bahramy, C. Bell, Z. Hussain, Y. Tokura, Z.-X. Shen, H. Y. Hwang, F. Baumberger, and W. Meevasana, Phys. Rev. Lett. 108, 117602 (2012).

Intrinsic Spin-Orbit Coupling in Superconducting δ-Doped SrTiO₃ Heterostructures

M. Kim, Y. Kozuka, C. Bell, Y. Hikita, and H. Y. Hwang, Phys. Rev. B 86, 085121(2012).

2011

Direct imaging of the Coexistence of Ferromagnetism and Superconductivity at the LaAlO₃/SrTiO₃ Interface

J. A. Bert, B. Kalisky, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and K. A. Moler, Nature Physics 7, 767-771 (2011).

Growth Temperature Dependence of the LaAlO₃/SrTiO₃ Interfacial Structure

Y. Wakabayashi, Y. Yamasaki, C. Bell, Y. Hikita, H. Y. Hwang, and T. Kimura, Journal of Physics: Conf. Series 320, 012074 (2011).

Electronic Structure of the SrTiO₃/LaAlO₃ Interface Revealed by Resonant Soft X-Ray Scattering

H. Wadati, J. Geck, D. G. Hawthorn, T. Higuchi, M. Hosoda, C. Bell, Y. Hikita, H. Y. Hwang, C. Schussler-Langeheine, E. Schierle, E. Weschke, and G. A. Sawatzky, IOP Conference Series: Materials Science and Engineering 24, 012012 (2011).

Reentrant Insulating State in Ultrathin Manganite Films

B. Kim, D. Kwon, T. Yajima, C. Bell, Y. Hikita, H. Y. Hwang, and B. G. Kim, Appllied Physics Letters 99, 092513 (2011).

Common Origin of the Circular-Dichroism Pattern in Angle-Resolved Photoemission Spectroscopy of SrTiO₃ and Cu_xBi₂Se₃

Y. Ishida, H. Kanto, Y. Ito, Y. Ota, K. Okazaki, W. Malaeb, M. Mulazzi, M. Okawa, S. Watanabe, C.-T. Chen, A. Kikkawa, Y. Taguchi, M. Kim, C. Bell, Y. Kozuka, H. Y. Hwang, Y. Tokura, and S. Shin, Physical Review Letters 107, 077601 (2011).

Structural Comparison of n-Type and p-Type LaAlO₃/SrTiO₃ Interfaces

R. Yamamoto, C. Bell, Y. Hikita, H. Y. Hwang, H. Nakamura, T. Kimura, and Y. Wakabayashi, Physical Review Letters 107, 036104 (2011).

Electronic Charges and Electric Potential at LaAlO₃/SrTiO₃ Interfaces Studied by Core-Level Photoemission Spectroscopy

M. Takizawa, S. Tsuda, T. Susaki, H. Y. Hwang, and A. Fujimori, Physical Review B 84, 245124 (2011).

Control of Electronic Conduction at an Oxide Heterointerface using Surface Polar Adsorbates

Y. W. Xie, Y. Hikita, C. Bell, and H. Y. Hwang, Nature Communications 2, 494 (2011).

General Considerations of the Electrostatic Boundary Conditions in Oxide Heterostructures

T. Higuchi and H. Y. Hwang, A chapter for a book Multifunctional Oxide Heterostructures, eds. E. Y. Tsymbal, E. Dagotto, C. B. Eom, and R. Ramesh, Oxford University Press (2011).

Electric Field Penetration in Au/Nb:SrTiO₃ Schottky Junctions Probed by Bias-Dependent Internal Photoemission

Y. Hikita, M. Kawamura, C. Bell, and H. Y. Hwang, Applied Physics Letters 98, 192103 (2011).

Fermi Surface and Superconductivity in Low-Density High-Mobility δ-Doped SrTiO₃

M. Kim, C. Bell, Y. Kozuka, M. Kurita, Y. Hikita, and H. Y. Hwang, Physical Review Letters, 107, 106801 (2011).

Nanometer-Scale Epitaxial Strain Release in Perovskite Heterostructures using “SrAlO_x” Sliding Buffer Layers

H. K. Sato, J. A. Mundy, T. Higuchi, Y. Hikita, C. Bell, D. A. Muller, and H. Y. Hwang, Applied Physics Letters 98, 171901 (2011), selected for the May 9, 2011 issue of Virtual Journal of Nanoscale Science & Technology.

Tuning the Electron Gas at an Oxide Heterointerface via Free Surface Charges

Y. W. Xie, C. Bell, Y. Hikita, and H. Y. Hwang, Advanced Materials 23, 1744-1747 (2011).

LaVO₄:Eu Phosphor Films with Enhanced Eu Solubility

T. Higuchi, Y. Hotta, Y. Hikita, S. Maruyama, Y. Hayamizu, H. Akiyama, H. Wadati, D. G. Hawthorn, T. Z. Regier, R. I. R. Blyth, G. A. Sawatzky, and H. Y. Hwang, Applied Physics Letters 98, 071902 (2011).

Built-in and Induced Polarization across LaAlO₃/SrTiO₃ Heterojunctions

G. Singh-Bhalla, C. Bell, J. Ravichandran, W. Siemons, Y. Hikita, S. Salahuddin, A. F. Hebard, H. Y. Hwang, and R. Ramesh, Nature Physics 7, 80-86 (2011).

A Heteroepitaxial Perovskite Metal-Base Transistor

T. Yajima, Y. Hikita, and H. Y. Hwang, Nature Materials 10, 198-201 (2011).

2010

Atomic-Resolution Spectroscopic Imaging of Oxide Interfaces

L. Fitting Kourkoutis, H. L. Xin, T. Higuchi, Y. Hotta, J. H. Lee, Y.Hikita, D. G. Schlom, H. Y. Hwang, and D. A. Muller, Philosophical Magazine 90, 4731-4749 (2010).

Enhancing the Electron Mobility via Delta-Doping in SrTiO₃

Y. Kozuka, M. Kim, H. Ohta, Y. Hikita, C. Bell, and H. Y. Hwang, Applied Physics Letters 97, 222115 (2010).

Microscopic Origins for Stabilizing Room Temperature Ferromagnetism in Ultrathin Manganite Layers

L. F. Kourkoutis, J. H. Song, H. Y. Hwang, and D. A. Muller, Proceedings of the National Academy of Sciences 107, 11682-11685 (2010).

Dramatic Mobility Enhancements in Doped SrTiO₃ Thin Films by Defect Management

Y. Kozuka, Y. Hikita, C. Bell, and H. Y. Hwang, Applied Physics Letters 97, 012107 (2010).

Charge Writing at the LaAlO₃/SrTiO₃ Surface

Y. W. Xie, C. Bell, T. Yajima, Y. Hikita, and H. Y. Hwang, Nano Letters 10, 2588-2591 (2010).
ACS Articles on Request link provides for up to 50 free e-prints of this article. Details can be found at ACS Publications Home Page.

Finite Size Effect and Phase Diagram of Ultra-Thin La_0.7Sr_0.3MnO₃

B. Kim, D. Kwon, J. H. Song, Y. Hikita, B. G. Kim, and H. Y. Hwang, Solid State Communications 105, 598-601 (2010).

An Emergent Change of Phase for Electronics

H. Takagi and H. Y. Hwang, Science 327, 1601-1602 (2010).

Two-Dimensional Confinement of 3d¹ Electrons in LaTiO₃/LaAlO₃ Multilayers

S. S. A. Seo, M. J. Han, G. W. J. Hassink, W. S. Choi, S. J. Moon, J. S. Kim, T. Susaki, Y. S. Lee, J. Yu, C. Bernhard, H. Y. Hwang, G. Rijnders, D. H. A. Blank, B. Keimer, and T. W. Noh, Physical Review Letters 104, 036401 (2010).

Complex Oxide Schottky Junctions

Y. Hikita and H. Y. Hwang, in Thin Film Metal-Oxides: Fundamentals and Applications in Electronics and Energy, edited by S. Ramanathan, Springer (2010).

2009

Two-Dimensional Normal-State Quantum Oscillations in a Superconducting Heterostructure

Y. Kozuka, M. Kim, C. Bell, B. G. Kim, Y. Hikita, and H. Y. Hwang, Nature 462, 487-490 (2009).

Magnetodielectric Coupling in Nonmagnetic Au/GaAs:Si Schottky Barriers

S. Tongay, A. F. Hebard, Y. Hikita, and H. Y. Hwang, Physical Review B 80, 205324 (2009).

Dominant Mobility Modulation by the Electric Field Effect at the LaAlO₃/SrTiO₃ Interface

C. Bell, S. Harashima, Y. Kozuka, M. Kim, B. G. Kim, Y. Hikita, and H. Y. Hwang, Physical Review Letters 103, 226802 (2009).

Resonant Soft X-ray Scattering Studies of Interface Reconstructions in SrTiO₃/LaAlO₃ Superlattices

H. Wadati, D. G. Hawthorn, J. Geck, T. Higuchi, Y. Hikita, H. Y. Hwang, L. F. Kourkoutis, D. A. Muller, S.-W. Huang, D. J. Huang, H.-J. Lin, C. Schuesler-Langeheine, H.-H. Wu, E. Schierle, E. Weschke, N. J. C. Ingle, and G. A. Sawatzky, Journal of Applied Physics 106, 083705 (2009).

Epitaxial Growth and Characterization of Eu_0.5Sr_0.5CoO₃ Thin Films by Off-Axis Sputtering

D. Kwon, Y. Wu, B. Kim, B. G. Kim, and H. Y. Hwang, Applied Physics Letters 95, 122505 (2009).

Effect of Substrate Strain on Lattice Structure, Electrical Resistivity, and Optical Conductivity of Nd_0.5Sr_0.5MnO₃ Thin Films Grown on SrTiO₃

S. Y. Jang, N. Nakagawa, S. J. Moon, T. Susaki, K. W. Kim, Y. S. Lee, H. Y. Hwang, and K. Myung-Whun, Solid State Communications 149, 1760-1764 (2009).

Enhanced Lattice Polarization in SrTiO₃/LaAlO₃ Superlattices Measured Using Optical Second Harmonic Generation

N. Ogawa, K. Miyano, M. Hosoda, T. Higuchi, C. Bell, Y. Hikita, and H. Y. Hwang, Physical Review B (Rapid Communications) 80, 081106 (2009) Editors' Suggestion.

Multiple Conducting Carriers Generated in LaAlO₃/SrTiO₃ Heterostructures

S. S. A. Seo, Z. Marton, W. S. Choi, G. W. J. Hassink, D. H. A. Blank, H. Y. Hwang, T. W. Noh, T. Egami, and H. N. Lee, Applied Physics Letters 95, 082107 (2009).

Mn₃O₄ Precipitates in Laser-Ablated Manganite Films

T. Higuchi, T. Yajima, L. Kourkoutis, Y. Hikita, N. Nakagawa, D. Muller, and H. Y. Hwang, Applied Physics Letters 95, 043112 (2009).

Interface Reconstruction in V-Oxide Heterostructures Determined by X-Ray Absorption Spectroscopy

H. Wadati, D. G. Hawthorn, J. Geck, T. Z. Regier, R. I. R. Blyth, T. Higuchi, Y. Hotta, Y. Hikita, H. Y. Hwang, and G. A. Sawatzky, Applied Physics Letters 95, 023115 (2009).

Thickness Dependence of the Mobility at the LaAlO₃/SrTiO₃ Interface

C. Bell, S. Harashima, Y. Hikita, and H. Y. Hwang, Applied Physics Letters 94, 222111 (2009).

Spectroscopic Evidence for Competing Reconstructions in Polar Multilayers LaAlO₃/LaVO₃/LaAlO₃

M. Takizawa, Y. Hotta, T. Susaki, Y. Ishida, H. Wadati, Y. Takata, K. Horiba, M. Matsunami, S. Shin, M. Yabashi, K. Tamasaku, N. Nishio, T. Ishikawa, A. Fujimori, and H. Y. Hwang, Physical Review Letters 102, 236401 (2009).

Modulation Doping of a Mott Quantum Well by a Proximate Polar Discontinuity

T. Higuchi, Y. Hotta, T. Susaki, A. Fujimori, and H. Y. Hwang, Physical Review B 79, 075415 (2009), Editors' Suggestion.

Termination Control of the Interface Dipole in La_0.7Sr_0.3MnO₃/Nb:SrTiO₃ (001) Schottky Junctions

Y. Hikita, M. Nishikawa, T. Yajima, and H. Y. Hwang, Physical Review B 79, 073101 (2009).

2008

Two Dimensional Electron Gases at Oxide Interfaces

J. Mannhart, D. H. A. Blank, H. Y. Hwang, A. J. Millis, and J. M. Triscone, MRS Bulletin 33, 1027-1034 (2008).

Complex Oxides on Fire

Y. Tokura and H. Y. Hwang, Nature Materials 7, 694-695 (2008).

Carrier doping in anatase TiO2 film by perovskite overlayer deposition

K. S. Takahashi and H. Y. Hwang, Applied Physics Letters 93, 082112 (2008).

Enhanced Thermodynamic Stability of Epitaxial Oxide Thin Films

J. H. Song, T. Susaki, and H. Y. Hwang, Advanced Materials 20, 2528-2532 (2008).

Vanishing Hall Coefficient in the Extreme Quantum Limit in Photocarrier-Doped SrTiO₃

Y. Kozuka, T. Susaki, and H. Y. Hwang, Physical Review Letters 101, 096601 (2008)

Negative Differential Resistance Induced by Mn Substitution at SrRuO₃/Nb:SrTiO₃ Schottky Interfaces

Y. Hikita, L. F. Kourkoutis, T. Susaki, D. A. Muller, H. Takagi, and H. Y. Hwang, Physical Review B 77, 205330 (2008).

Atomic-Scale Chemical Imaging of Composition and Bonding by Aberration-Corrected Microscopy

D. A. Muller, L. F. Kourkoutis, M. Murfitt, J. H. Song, H. Y. Hwang, J. Silcox, N. Dellby, and O. L. Krivanek, Science 319, 1073-1076 (2008).

Hard X-Ray Photoemission Study of LaAlO₃/LaVO₃ Multilayers

H. Wadati, Y. Hotta, A. Fujimori, T. Susaki, H. Y. Hwang, Y. Takata, K. Horiba, M. Matsunami, S. Shin, M. Yabashi, K. Tamasaku, Y. Nishino, and T. Ishikawa, Physical Review B 77, 045122 (2008).

New Physical Properties at Oxide Interfaces

Y. Hotta and H. Y. Hwang, Parity (Japanese) 23, 30 (2008).

2007

Polar Discontinuity Doping of the LaVO₃/SrTiO₃ Interface

Y. Hotta, T. Susaki, and H. Y. Hwang, Physical Review Letters 99, 236805 (2007).

Growth Mode Control of the Free Carrier Density in SrTiO₃ Homoepitaxial Films

A. Ohtomo and H. Y. Hwang, Journal of Applied Physics 102, 083704 (2007).

Temperature-Dependent Polarity Reversal in Au/Nb:SrTiO₃ Schottky Junctions

T. Susaki, Y. Kozuka, Y. Tateyama, and H. Y. Hwang, Physical Review B 76, 155110 (2007).

Characterization of LaVOx Thin Films by Photoemission Spectroscopy

H. Wadati, Y. Hotta, M. Takizawa, A. Fujimori, T. Susaki, and H. Y. Hwang, Journal of Applied Physics 102, 053707 (2007).

Asymmetric Interface Profiles in LaVO₃/SrTiO₃ Heterostructures Grown by Pulsed Laser Deposition

L. F. Kourkoutis, D. A. Muller, Y. Hotta, and H. Y. Hwang, Applied Physics Letters 91, 163101 (2007).

Optically Tuned Dimensionality Crossover in Photocarrier-Doped SrTiO₃: Onset of Weak Localization

Y. Kozuka, Y. Hikita, T. Susaki, and H. Y. Hwang, Physical Review B 76, 085129 (2007).

Characterization of the Schottky barrier in SrRuO₃/Nb:SrTiO₃ junctions

Y. Hikita, Y. Kozuka, T. Susaki, H. Takagi, and H. Y. Hwang, Applied Physics Letters 90, 143507 (2007).

Transport Mechanisms in Manganite-Titanate Heterojunctions

T. Susaki, N. Nakagawa, and H. Y. Hwang, Physical Review B 75, 104409 (2007).

2006

Electronic Structure of the Mott Insulator LaVO₃ in a Quantum-Well Geometry

Y. Hotta, H. Wadati, A. Fujimori, T. Susaki, and H. Y. Hwang, Applied Physics Letters 89, 251916 (2006).

Nanometer Scale Electronic Reconstruction at the Interface between LaVO₃ and LaVO₄

L. F. Kourkoutis, Y. Hotta, T. Susaki, H. Y. Hwang, and D. A. Muller, Physics Review Letters 97, 256803 (2006).

Tuning Interface States

H. Y. Hwang, Science 313, 1895-1896 (2006).

Growth and Electronic Structure of LaVO_x Films

Y. Hotta, Y. Mukunoki, T. Susaki, H. Y. Hwang, L. Fitting, and D. A. Muller, Applied Physics Letters 89, 031918 (2006).

Lattice-Polarization Effects on Electron-Gas Charge Densities in Ionic Superlattices

D. R. Hamann, D. A. Muller, and H. Y. Hwang, Physical Review B 73, 195403 (2006).

Rectifying NdNiO₃/Nb:SrTiO₃ junctions as a probe of the surface electronic structure of NdNiO₃

Y. Kozuka, T. Susaki, and H. Y. Hwang, Applied Physics Letters 88, 142111 (2006).

Why Some Interfaces Cannot be Sharp

N. Nakagawa, H. Y. Hwang, and D. A. Muller, Nature Materials 5, 204-209 (2006).

Atomic Control of the Electronic Structure at Complex Oxide Heterointerfaces

H. Y. Hwang, MRS Bulletin 31, 28-35 (2006).

2005

Oxygen Vacancies Shine Blue

H. Y. Hwang, Nature Materials 4, 803-804 (2005).

Atomically Flat (110) SrTiO₃ and Heteroepitaxy

Y. Mukunoki, N. Nakagawa, T. Susaki, and H. Y. Hwang, Applied Physics Letters 86, 171908 (2005).

Magnetocapacitance and Exponential Magnetoresistance in Manganite-Titanate Heterojunctions

N. Nakagawa, M. Asai, Y. Mukunoki, T. Susaki, and H. Y. Hwang, Applied Physics Letters 86, 082504 (2005).

2004

High-Mobility Electron Transport in SrTiO₃ Heterostructures

A. Ohtomo and H. Y. Hwang, Oyo Buturi (Japanese) 73, 605 (2004).

Active Mode Locking of Broadband Quantum Cascade Lasers

A. Soibel, F. Capasso, C. Gmachl, M. L. Peabody, A. M. Seargent, R. Paiella, H. Y. Hwang, D. L. Sivco, A. Y. Cho, H. C. Liu, C. Jirauschek, and F. X. Kaertner, IEEE Journal of Quantum Electronics 40, 844-851 (2004).

Atomic-Scale Imaging of Nanoengineered Oxygen Vacancy Profiles in SrTiO₃

D.A. Muller, N. Nakagawa, A. Ohtomo, J.L. Grazul, and H.Y. Hwang, Nature 430, 657-661 (2004).

Surface Depletion in Doped SrTiO₃ Thin Films

A. Ohtomo and H.Y. Hwang, Applied Physics Letters 84, 1716 (2004).

A High-Mobility Electron Gas at the LaAlO₃/SrTiO₃ Heterointerface

A. Ohtomo and H. Y. Hwang, Nature 427, 423-426 (2004).

New Physics Arising from Single Unit Cell Growth Control

A. Ohtomo and H.Y. Hwang, Parity (Japanese) 19, 22 (2004).

High Mobility Electrons in SrTiO₃ Heterostructures

H.Y. Hwang, A. Ohtomo, N. Nakagawa, D.A. Muller, and J.L. Grazul, Physica E 22, 712-716 (2004).

-2003

Quantitative Atomic-Scale Profiles of Oxygen Vacancies in SrTiO₃

D.A. Muller, A. Ohtomo, J.L. Grazul, and H.Y. Hwang, Microscopy and Microanalysis 9 (suppl. 2), 110-111 (2003).

Artificial Charge-Modulation in Atomic-Scale Perovskite Titanate Superlattices

A. Ohtomo, D.A. Muller, J.L. Grazul, and H.Y. Hwang, Nature 419, 378-380 (2002).

Artificial Charge Modulations in La-Doped SrTiO₃ Superlattices

D.A. Muller, A. Ohtomo, J. Grazul, and H.Y. Hwang, Microscopy and Microanalysis 8(suppl. 2), 576-577 (2002).

Quantum Cascade Lasers: Ultrahigh-Speed Operation, Optical Wireless Communication, Narrow Linewidth, and Far-Infrared Emission

F. Capasso, R. Paiella, R. Martini, R. Colombelli, C. Gmachl, T. L. Myers, M. S. Taubman, R. M. Williams, C. G. Bethea, K. Unterrainer, H. Y. Hwang, D. L. Sivco, A. Y. Cho, A. M. Sergent, H. C. Liu, and E. A. Whittaker, IEEE Journal of Quantum Electronics 38, 511-532 (2002).

Quantum Cascade Lasers with Double Metal-Semiconductor Waveguide Resonators

K. Unterrainer, R. Colombelli, C. Gmachl, F. Capasso, H. Y. Hwang, A. M. Sergent, D. L. Sivco, and A. Y. Cho, Applied Physics Letters 80, 3060 (2002).

Free-Space Optical Transmission of Multimedia Satellite Data Streams Using Mid-Infrared Quantum Cascade Lasers

R. Martini, C. G. Bethea, F. Capasso, C. Gmachl, R. Paiella, E. A. Whittaker, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Electronics Letters 38, 181-183 (2002).

Recent Results in Quantum Cascade Lasers and Intersubband Transitions in GaN/AlGaN Multiple Quantum Wells

C. Gmachl, H. M. Ng, R. Paiella, R. Martini, H. Y. Hwang, D. L. Sivco, F. Capasso, A. Y. Cho, S. V. Frolov, S. N. G. Chu, and H. C. Liu, Physica E 13, 823-828 (2002).

Epitaxial Growth and Electronic Structure of LaTiO_x Films

A. Ohtomo, D.A. Muller, J.L. Grazul, and H.Y. Hwang, Applied Physics Letters 80, 3922 (2002).

Strong self-phase modulation in planar chalcogenide glass waveguides

S. Spaelter, H. Y. Hwang, J. Zimmermann, G. Lenz, T. Katsufuji, S-W. Cheong, and R. E. Slusher, Optics Letters 27, 363-365 (2002).

High-Speed Digital Data Transmission Using Mid-Infrared Quantum Cascade Lasers

R. Martini, R. Paiella, C. Gmachl, F. Capasso, E. A. Whittaker, H. C. Liu, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Electronics Letters 37, 1290-1292 (2001).

High-Frequency Modulation without the Relaxation Oscillation Resonance in Quantum Cascade Lasers

R. Paiella, R. Martini, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, A. Y. Cho, E. A. Whittaker, and H. C. Liu, Applied Physics Letters 79, 2526 (2001).

Absence of Relaxation Oxcillation in Quantum Cascade Lasers Verified by High-Frequency Modulation

R. Martini, R. Paiella, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, A. Y. Cho, E. A. Whittaker, and H. C. Liu, CLEO (2001).

Quantum Cascade Lasers with Low-Loss Chalcogenide Lateral Waveguides

C. Gmachl, H. Y. Hwang, R. Paiella, D. L. Sivco, J. N. Baillargeon, F. Capasso, and A. Y. Cho, IEEE Photonics Technology Letters 13, 182-184 (2001).

Gain-Switching and Active Mode-Locking of Mid-Infrared Quantum Cascade Lasers

R. Paiella, F. Capasso, C. Gmachl, C. G. Bethea, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, A. Y. Cho, and H. C. Liu, Optics and Photonics News, p. 22-23 December 2000.

Gain-Switching and Mode-Locking of Quantum Cascade Lasers

R. Paiella, F. Capasso, C. Gmachl, C. G. Bethea, H. Y. Hwang, D. L .Sivco, J. N. Baillargeon, A. L. Hutchinson, A. Y. Cho, and H. C. Liu, LEOS 2000 Invited.

Monolithic Active Mode Locking of Quantum Cascade Lasers

R. Paiella, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, A. L. Hutchinson, A. Y. Cho, and H. C. Liu, Applied Physics Letters 77, 169 (2000).

Highly Nonlinear Chalcogenide Glasses for Ultrafast All Optical Switching in Optical TDM Communication Systems

S. Spaelter, G. Lenz, R. E. Slusher, H. Y. Hwang, J. Zimmermann, T. Katsufuji, S-W. Cheong, and M. E. Lines, OFC’00, Baltimore, MD, 3/5-10/00, paper ThI4.

Strong Bragg Gratings in Chalcogenide Glass Waveguides

S. Spaelter, H. Y. Hwang, J. Rogers, T. Katsufuji, G. Lenz, S-W. Cheong, R. E. Slusher, A. Kelsey, and B. MacLeod, CLEO/QELS 2000, San Francisco, CA, 5/7-12/00, paper CtuH2.

Large Kerr Effect in Bulk Se-based Chalcogenide Glasses

G. Lenz, J. Zimmermann, T. Katsufuji, M. E. Lines, H. Y. Hwang, S. Spaelter, R. E. Slusher, S-W. Cheong, J. S. Sanghera, and I. D. Aggarwal, Optics Letters 25, 254-256 (2000).

Anomalous Magneto-Transport Properties of R₂Mo₂O₇ Near the Magnetic Phase Boundary

T. Katsufuji, H. Y. Hwang, and S-W. Cheong, Physical Review Letters 84, 1998 (2000).

Magnon Damping by Magnon-Phonon Coupling in Manganese Perovskites

P. Dai, H. Y. Hwang, J. Zhang, J. A. Fernandez-Baca, S-W. Cheong, C. Kloc, Y. Tomioka, and Y. Tokura, Physical Review B 61, 9553 (2000).

Ferromagnetism versus Charge/Orbital Ordering in Mixed-Valent Manganites

S-W. Cheong and H. Y. Hwang, in Colossal Magnetoresistive Oxides, edited by Y. Tokura, p. 237 Gordon and Breach Science Publishers, Advances in Condensed Matter Science (2000).

Spin-Polarized Tunneling Magnetoresistance in Half-Metallic Oxides

H. Y. Hwang and S-W. Cheong, in Colossal Magnetoresistive Oxides, edited by Y. Tokura, p. 307 Gordon and Breach Science Publishers, Advances in Condensed Matter Science (2000).

Nonlinear Optics in Chalcogenide Waveguides

S. Spaelter G. Lenz, H. Y. Hwang, J. Zimmermann, S-W. Cheong, T. Katsufuji, and R. E. Slusher, OSA Annual Meeting 1999, Santa Clara, CA, paper WLL111.

Optimizing Chalcogenide Glass Nonlinearities at 1.55 mm

G. Lenz, M. E. Lines, J. Zimmermann, T. Katsufuji, H. Y. Hwang, S. Spaelter, S-W. Cheong, R. E. Slusher, A. J. Bruce, and J. B. MacChesney, OSA Annual Meeting 1999, Santa Clara, CA, paper WLL112.

Large Kerr Effect Chalcogenide Glasses for Ultrafast All-Optical Processing; Theory and Experiment

G. Lenz, M. E. Lines, R. E. Slusher, J. Zimmermann, T. Katsufuji, H. Y. Hwang, S. Spaelter, and S-W. Cheong, to be submitted to Journal of the Optical Society of America B.

Nonlinear Pulse Dynamics in Planar Chalcogenide Glass Waveguides

S. Spaelter, G. Lenz, H. Y. Hwang, J. Zimmermann, S-W. Cheong, T. Katsufuji, and R. E. Slusher, in Proceedings of Nonlinear Guided Waves and Their Applications OSA Topical Meeting, Dijon, FR 9/1-3/99, postdeadline paper PD6.

Chalcogenide Glass Films for Nonlinear Optics

S. Spaelter, G. Lenz, H. Y. Hwang, J. Zimmermann, S-W. Cheong, T. Katsufuji, M. E. Lines, and R. E. Slushe, in Proceedings of Nonlinear Guided Waves and Their Applications OSA Topical Meeting, Dijon, FR 9/1-3/99, paper ThD38.

Intergrain Magnetoresistance via Second-Order Tunneling in Perovskite Manganites

S. C. Lee, H. Y. Hwang, B. I. Shraiman, and S-W. Cheong, Physical Review Letters 82, 4508 (1999).

Anisotropy of Magnetoresistance in (110) La_0.7Sr_0.3MnO₃ Thin Films

Y. Suzuki and H. Y. Hwang, Journal of Applied Physics 85, 4797-4799 (1999).

Magnetoresistance in a Ferromagnet with Few Electrons: (Eu,Tm)Se

B. Batlogg, F. Jacob, H. Y. Hwang, E. Bucher, G. S. Boebinger, and F. Balakirev, in Proceedings of the Conference On Physical Phenomenon at High Magnetic Fields - III, National High Magnetic Field Lab, Tallahassee, Fl, 10/26-27/98.

Magnetic Anisotropy and Lattice Distortions in the Doped Perovskite Manganites

Y. Suzuki, H. Y. Hwang, S-W. Cheong, R. B. van Dover, A. Asamitsu, and Y. Tokura, Materials Research Society Symposium Proceedings 494, 41-54 (1998).

Magnetic Anisotropy of Doped Manganite Thin Films and Crystals

Y. Suzuki, H. Y. Hwang, S-W. Cheong, T. Siegrist, R. B. van Dover, A. Asamitsu, and Y. Tokura, Journal of Applied Physics 83, 7064-7066 (1998).

Evolution of the Low-Frequency Spin Dynamics in Ferromagnetic Manganites

J. A. Fernandez-Baca, P. Dai, H. Y. Hwang, C. Kloc, and S-W. Cheong, Physical Review Letters 80, 4012 (1998).

Softening and Broadening of the Zone Boundary Magnons in Pr_0.63Sr_0.37MnO₃

H. Y. Hwang, P. Dai, S-W. Cheong, G. Aeppli, D. A. Tennant, and H. A. Mook, Physical Review Letters 80, 1316 (1998).

Competition Between Charge Ordering and Ferromagnetism in Manganese Perovskites

P. G. Radaelli, G. Iannone, D. E. Cox, M. Marezio, H. Y. Hwang, and S-W. Cheong, Physica B 241-243, 295 (1998).

Enhanced Intergrain Tunneling Magnetoresistance in Half-Metallic CrO₂ Films

H. Y. Hwang and S-W. Cheong, Science 278, 1607-1609 (1997).

Structural Effects on the Magnetic and Transport Properties of Perovskite A_1-xA'_xMnO₃ (x = 0.25, 0.30)

P. G. Radaelli, G. Iannone, M. Marezio, H. Y. Hwang, S-W. Cheong, J. D. Jorgensen, and D. N. Argyriou, Physical Review B 56, 8265 (1997).

The Effects of Strain on the Magnetic Anisotropy of Doped Manganite Thin Films

Y. Suzuki, C. Tsai, H. Y. Hwang, S-W. Cheong, and R. B. van Dover, Materials Research Society Symposium Proceedings, 474, 205-210 (1997).

Low-Field Magnetoresistance in the Pyrochlore Tl₂Mn₂O₇

H. Y. Hwang and S-W. Cheong, Nature 389, 942-944 (1997).

The Role of Strain in Magnetic Anisotropy of Manganite Thin Films

Y. Suzuki, H. Y. Hwang, S-W. Cheong, and R. B. van Dover, Applied Physics Letters 71, 140 (1997).

Charge-Ordered Stripes in La_1-xCa_xMnO₃ with x > 0.5

C. H. Chen, S-W. Cheong, and H. Y. Hwang, Journal of Applied Physics 81, 4326-4330 (1997).

Charge Localization by Static and Dynamic Distortions of the MnO₆ Octahedra in Perovskite Manganites

P. G. Radaelli, M. Marezio, H. Y. Hwang, S-W. Cheong, and B. Batlogg, Physical Review B 54, 8992 (1996).

Ln₃Cu₄P₄O₂: A New Lanthanide Transition Metal Pnictide Oxide Structure Type

R. J. Cava, H. W. Zandbergen, J. J. Krajewski, T. Siegrist, H. Y. Hwang, and B. Batlogg, Journal of Solid State Chemistry 129, 250-256 (1996).

Spin-Polarized Intergrain Tunneling in La_2/3Sr_1/3MnO₃

H. Y. Hwang, S-W. Cheong, N. P. Ong, and B. Batlogg, Physical Review Letters 77, 2041 (1996).

Enhancing the Low Field Magnetoresistive Response in Perovskite Manganites

H. Y. Hwang, S-W. Cheong, and B. Batlogg, Applied Physics Letters 68, 3494 (1996).

Structural Phase Diagram of Perovskite A_0.7A'_0.3MnO₃ (A = La, Pr; A' = Ca, Sr, Ba): A New Imma Allotype

P. G. Radaelli, M. Marezio, H. Y. Hwang, and S-W. Cheong, Journal of Solid State Chemistry 122, 444-447 (1996).

Giant Magnetoresistance in Pyrochlore Tl₂In_xMn₂O₇

S-W. Cheong, H. Y. Hwang, B. Batlogg, and L. W. Rupp, Jr., Solid State Communications 98, 163-166 (1996).

Origin and Control of the “Colossal” Magnetoresistance in Doped LaMnO₃

S-W. Cheong, H. Y. Hwang, P. G. Radaelli, D. E. Cox, M. Marezio, B. Batlogg, P. Schiffer, and A. P. Ramirez Proceedings of Physical Phenomena at High Magnetic Fields - II, edited by Z. Fisk et al. (World Scientific, Singapore, 1996), p. 702.

Peroxisomes Induced in Candida Boidinii by Methanol, Oleic Acid, and D-alanine Vary in Metabolic Function but Share Common Integral Membrane Proteins

J. M. Goodman, S. B. Trapp, H. Y. Hwang, and M. Veenhuis, Journal of Cell Science 97, 193-204 (1990).

Photoconductivity and non-exponential relaxation at insulating LaAlO3/SrTiO3 interfaces