|
|
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 new applications such as filters, transmission lines, motors,
and quantum computers. His group carries out numerical simulations on several
high-performance clusters of workstations. |
 |
|
 |
Brian is a postdoc at the SLAC National Accelerator Laboratory and the Stanford Institute for Materials and Energy Science (SIMES). He received his Ph.D. from the University of North Dakota with Bill Schwalm. He then served as an instructor at the University of North Dakota, an assistant professor at the University of Minnesota - Morris, and worked in Juana Moreno's group at the University of North Dakota and Mark Jarrell's group at the University of Cincinnati. Brian uses 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 (both elastic (REXS) and inelastic (RIXS)) experiments.
|
|
|
 |
Adam is a post-doc with SLAC/Stanford/SIMES. He earned his Ph.D. from the
University of Washington in 2008. His thesis work
was about the inelastic scattering of high-energy
electrons in solids and electron energy-loss
spectroscopy (EELS). Adam is interested in the
theory and computation of x-ray absorption spectra
(XAS) and non-resonant inelastic x-ray scattering
(NRIXS) and has experience with real-space dft-based
methods for simulations of these spectroscopies,
specifically the computer program FEFF. Currently
Adam is interested in the theory and computation of
resonant inelastic x-ray scattering (RIXS) as
applied to the iron pnictides.
|
|
|
 |
Lex is a post-doc with the Stanford, the Stanford Institute for
Materials and Energy Science (SIMES) and the SLAC National Accelerator
Library. He received his Ph. D. from the University of Florida with
Drs. Peter Hirschfeld and Hai-Ping Cheng as co-chairs. His work
focused on numerical studies of correlated electronic systems through
the use of density functional theory, quantum cluster methods,
Hartree-Fock and the FLEX random phase approximation. These methods
were applied in particular to study the pnictide and cuprate
superconductors. His current interests have branched out from
superconducting systems to charge density-wave systems such as the
rare earth tri-tellurides, and to time-resolved measurements in a
variety of systems.
|
|
|
 |
Michael is a postdoc in the group of Professor Devereaux at Stanford
Institute for Materials and Energy Science (SIMES) and the SLAC National
Accelerator Library. He received his doctoral degree at the University of
Augsburg (Germany) with Professor Arno Kampf. His work focused on
dynamical mean-field methods in conjunction with continuous-time Quantum
Monte Carlo simulations. He studied correlation effects in a band
insulator, superconducting phase and pairing fluctuations leading to
non-Fermi liquid behavior and anomalous transport in two spatial
dimensions, and unconventional critical behavior of charge and spin
degrees of freedom at the Mott transition in two-dimensional organic
conductors. His current interests cover time-domain spectroscopy,
non-equilibrium physics in a variety of systems and the three-band Hubbard
model relevant to cuprate superconductors.
|
|
|
 |
Cheng-Chien is currently a postdoctoral scholar at the Stanford Institute
for Materials and Energy Science.
He obtained his PhD from Stanford University in Sep. 2011 under the
supervision of Prof. Tom Devereaux.
His research concerns the physics of strongly correlated materials,
including orbital ordering, quantum magnetism,
superconductivity and the theory of photon-based spectroscopies.
|
|
|
 |
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.
|
|
|
 |
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. |
|
|
 |
Yvonne is a graduate student in
physics at Stanford. She received an
undergraduate degree in physics and minor in
biology from Stanford in 2009. She is
interested in using quantum Monte Carlo methods
to model strongly correlated systems, such as high temperature superconductors. In her free time, she does social dance and archery.
|
|
|
 |
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. Recently, he has
worked on a Hartree Fock mean field theory for a 3-band model of the
cuprates' pseudogap state, to find a basis for proposed or observed
phases. His current work has shifted focus to T matrix methods for
understanding impurity effects in the iron-based superconductors,
particularly in the SDW phase.
|
|
|
 |
Saahil is currently a graduate PhD student at Stanford. He received his
undergraduate degree and completed master's degree requirements in
particle physics in 2010. He is currently studying numerical techniques,
such as determinant quantum monte carlo methods. His interests are in
numerical optimization and strongly correlated systems in condensed matter
theory.
|
|
Current and Frequent Visitors
|
|
 |
Giacomo Ghiringhelli
Area: Resonant inelastic x-ray scattering
Politecnico di Milano |
CONTACT |
Giacomo is Associate Professor at the Physics Department of the
Politecnico di Milano, in Italy. He is visiting scholar at SIMES and the
Department of Physics at Stanford, guest of Prof. Devereaux until February
2012. His scientific activity is in experimental x-ray spectroscopy of
magnetic and correlated electron systems. He has been developing high
resolution resonant inelastic soft x-ray scattering (RIXS), working at the
European Synchrotron Radiation Facility (ESRF) and the Swiss Light Source
(SLS). He is also expert of the design of x-ray spectrometers for
RIXS. Recently he has been applying RIXS to the study of high energy spin
excitations in layered cuprates (superconductors and insulators). More in
general, is has been working to the advance use of polarization dependent
resonant spectroscopies: crystal field excitations studied by RIXS,
orbital and magnetic anisotropies of CMR manganites studied by linear and
circular dichroism in XAS, spin states in HTcS studied by spin resolved
resonant photoemission.
|
|
|
 |
|
|
 |
|
|
 |
|
|
 |
|
|
 |
|
|
Former Members of Devereaux Group
|
|
 |
Steve Johnston
Formerly: Graduate Student
Current: Post-doc, IFW, Dresden, Germany |
CONTACT |
Steve was a member of the group from 2004-2010, earning his Masters (2006)
and Ph.D. (2010) from the University of Waterloo. His Ph.D. research used
a combination of analytical and numerical techniques (including DQMC and
exact diagonalization) to study electron-phonon interactions in correlated
quasi-2D systems such as the high-Tc cuprates. He is presently a
postdoctoral researcher in the Theory Group at the Leibniz Institute for
Solid State and Materials Research in Dresden, Germany. His current
research interests are electron-boson interactions as they appear in
resonant inelastic x-ray scattering, photoemission, and optical
spectroscopy as well as polaron physics in strongly correlated oxides.
|
|
|
 |
Patrick Kirchmann
Formerly: Research Associate
Current: Post-doc, Fritz Haber Institut, Berlin, Germany |
CONTACT |
I obtained my doctoral degree from the Freie Universitaet Berlin in 2009 for the study "Ultrafast Electron Dynamics in Low-Dimensional Materials". My research within
the SIMES collaboration was funded by the
Alexander-von-Humboldt Foundation through a
Feodor-Lynen stipend and focuses on ultrafast
dynamic processes in solid state materials using
pump-probe photoemission techniques directly in the
time domain. I employ time- and angle-resolved
photoemission spectroscopy to study collective
excitations in strongly correlated electron
systems. The strength of this approach is the
complementary information that is obtained by the
simultaneous measurement of (i) the single-particle
spectral function in frequency space and (ii)
many-body correlations in the time domain. Even more
so, the introduction of spin resolution to the
experimental setup will provide unique capabilities
for the study of correlation effects in spin-ordered
electronic structures such as topological
insulators.
|
|
|
 |
|
|
 |
|
|
|
|
|