Department of Applied Physics

Description

Condensed Matter Physics

My group 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 energy-related applications. His group carries out numerical simulations on high-performance CPU and GPU mid-range computing clusters and supercomputers. Currently, we are calculating a variety of photon-based spectroscopies in strongly correlated materials to understand emergent phases of matter and how states of matter evolve in the time-domain when pumped by lasers. We use Quantum Monte Carlo, exact diagonalizations, dynamical mean field theory, and non-equilibrium Green's function techniques and algorithms to in multi-scale computing applications. We work very closely with experimentalists using modern light sources, such as the Linac Coherent Light Source and the Stanford Synchrotron Radiation Lightsource. We are part of the Stanford Institute of Materials and Energy Science (SIMES) and are funded largely by the Department of Energy.

Courses Taught

• Quantum Field Theory

Selected Publications

• Evidence for Weak Electronic Correlations in Iron Pnictides
• A Momentum-Dependent Perspective on Quasiparticle Interference in Bi2Sr2CaCu2O8+δ
• Anomalous Spectral Broadening and Symmetry Breaking in the Pseudogap State of Bi-2201
• Band- and Momentum-Dependent Electron Dynamics in Superconducting Ba(Fe0.939Co0.061)2As2
• Time-Resolved Photoemission of Strongly Correlated Electrons Driven Out of Equilibrium
• Unraveling the Nature of Charge Excitations in La2CuO4 with Momentum-Resolved Cu K-Edge Resonant Inelastic X-Ray Scattering
• A Review of Electron–Phonon Coupling Seen in the High-Tc Superconductors by Angle-Resolved Photoemission Studies (ARPES)
• Inelastic Light Scattering in Strongly Correlated Materials
• Resonant Inelastic X-ray Scattering Studies of Valence Excitations
• High pressure evolution of Fe2O3 electronic structure revealed by X-ray absorption spectroscopy