Prof. Tom Devereaux

Professor Devereaux develops numerical methods and theories of photon-based spectroscopies of strongly correlated materials. The goal of his research is to understand electron dynamics via a combination of analytical theory and numerical simulations to provide insight into new quantum materials and how to better use them in applications that impact energy technologies. His group uses large-scale numerical simulations at local and Tier I computing facilities.

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Prof. Tom Devereaux

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Dr. Brian Moritz

Brian is an Associate Staff Scientist at the SLAC National Accelerator Laboratory in the Stanford Institute for Materials and Energy Sciences (SIMES). Brian has used a variety of numerical techniques, including quantum Monte Carlo and exact diagonalization, to study model Hamiltonians of strongly correlated materials. Using efficient, parallel algorithms to perform numerical simulations, he is then able to compare his results to data from angle-resolved photoemission spectroscopy (ARPES) and resonant X-ray scattering. Recently, Brian has used a nonequilibrium formulation of dynamical mean-field theory (DMFT) to understand the behavior of correlated electron systems driven out of equilibrium by strong fields. He now focuses on understanding the nonequilibrium physics revealed by various types of pump-probe experiments including those performed using the soft x-ray (SXR) end-station at the Linac Coherent Light Source (LCLS).

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Dr. Brian Moritz

Ph.D., M.S., B.S.Eng.Phys.: University of North Dakota
Adjunct Professor: University of North Dakota (2007-Pres.)
NERSC Users' Group Executive Committee: BES Rep. (2010-2012)

• Correlation induced nonthermal behavior from high-field ultrafast transient pumping (submitted to Nature Comm.)
• Phase Fluctuations and the Absence of Topological Defects in Photo-excited Charge Ordered Nickelate, accepted Nature Comm. (to appear May 2012)
• Theoretical description of high-order harmonic generation in bulk crystals in the non-equilibrium Keldysh formalism, arXiv:1204.1803 (2012) (submitted to New J. Phys.)
• Time-resolved photoemission of correlated electrons driven out of equilibrium, Phys. Rev. B 81, 165112 (2010)
• A momentum-dependent perspective on quasiparticle interference in Bi₂Sr₂CaCu₂O_8+δ, Nature Physics 5, 718 - 721 (2009)
• Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-T_c superconductors, New J. Phys. 11, 093020 (2009)

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Dr. Michael Sentef

I joined the Devereaux group at Stanford/SLAC as a Postdoc in July 2011 after receiving my PhD from Augsburg University in Germany (PhD thesis). My research focusses on developing theories and computational algorithms for pump-probe spectroscopies in solids. Our goal is to understand how pump lasers create photoexcited electrons, and how the excitations decay due to scattering processes such as electron-phonon scattering. In addition, we work on simulating various probe spectroscopies of these photoexcited systems (angle-resolved photoemission, optical spectroscopies, X-ray scattering, or electron scattering) in close collaboration with experimentalists. The use of these complementary probes of electronic as well as lattice degrees of freedom is expected to lead not only to a deeper understanding of complex materials close to and far away from equilibrium, but will also allow us to tailor materials for use in future energy-relevant devices.

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Dr. Michael Sentef

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Dr. Krzysztof Wohlfeld

I joined Tom Devereaux's group as a postdoc in November 2012 after staying as a Humboldt postdoctoral fellow in Jeroen van den Brink's group in IFW Dresden (Germany). I received my PhD in 2009 from the Jagiellonian University in Cracow (Poland) in the group of Andrzej M. Oles. My main research interests concerns understanding collective excitations in the transition metal oxides by developing simple but still rather realistic effective models, solving these models using combined analytic and simple numerical calculations, and then comparing the results to such experiments as resonant inelastic x-ray scattering (RIXS) or electron energy loss spectroscopy (EELS). This close collaboration between theory and experiment has recently allowed to identify an effective separation of spin and orbital degree of freedom of an electron in a quasi-1D cuprate (somewhat similarly to the well-known spin-charge separation in 1D interacting systems).

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Dr. Krzysztof Wohlfeld

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Elizabeth Nowadnick

Beth is a fifth year graduate student in physics at Stanford. She received her undergraduate degree in physics and mathematics from Stanford. Her research interests lie in the area of theoretical condensed matter physics. She is currently using quantum monte carlo techniques to model strongly correlated materials.

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Elizabeth Nowadnick

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Chunjing Jia

I graduated from USTC and got my Bachlor's degree in 2008. Now I am a graduate student in the Applied Physics Department at Stanford. I joined Devereaux's group in Fall quarter 2008. My research interests mainly lie in the computational study of high temperature superconductors, exact diagonalization, and inelastic light scattering spectroscopy.

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Chunjing Jia

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Yvonne Kung

Yvonne is a graduate student in physics at Stanford. She received an undergraduate degree in physics and a minor in biology from Stanford in 2009. Her interests lie in elucidating the behavior of strongly correlated systems using analytical and numerical techniques, such as determinant quantum Monte Carlo. These results can be compared to pump-probe experiments conducted at LCLS, as well as angle-resolved photoemission studies and x-ray absorption data. In the summer of 2012, she will be participating in the National Science Foundation’s East Asia and Pacific Summer Institutes program to study model Hamiltonians of strongly correlated materials using the tensor product state technique.

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Yvonne Kung

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Nachum Plonka

Nachum has been a PhD student at Stanford since 2009. He has been conducting theoretical research in high temperature superconductors, focusing on interesting non-superconducting phases that may shed light on superconductivity. As of 2011, he is studying the spin density wave (SDW) phase of iron-based superconductors, looking at magnetic and orbital degrees of freedom and their interplay, as they manifest in impurity effects (T matrix) and band structure. Previously, he had studied a Hartree Fock mean field theory for a 3-band model of the cuprates' pseudogap state, to investigate proposed or observed phases.

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Nachum Plonka

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Yao Wang

Yao is a graduate student in Applied Physics Department at Stanford. He received his Bachlor's degree at the University of Science and Technology of China in 2011 and joined the group in summer 2012. His research interests lie in theoretical and computational method of correlated systems. He is currently studying equilibrium and non-equilibrium time domain problems utilizing exact diagonalization method.

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Yao Wang

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Martin Claassen

Martin is currently a graduate student at Stanford University working in the group of Tom Devereaux on the development of computational methods for strongly correlated system. In particular, Martin has worked on methods for mitigating the sign problem and algorithmic improvements in the efficiency of Monte Carlo sampling by combining mean-field information. This information is currently UNDER CONSTRUCTION.

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Martin Claassen

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