135 citations · 253 across the 13 of their papers we have counts for
8 papers · 1 filter
A reexamination of the effective fine structure constant of graphene, as measured in graphite
Yu Gan, Gilberto de la Pena Munoz, Anshul Kogar +5
We present a refined and improved study of the influence of screening on the effective fine structure constant of graphene, , as measured in graphite using inelastic x-ray sca…
Temperature-resolution anomalies in the reconstruction of time dynamics from energy-loss experiments
Anshul Kogar, Sean Vig, Yu Gan +1
Inelastic scattering techniques provide a powerful approach to studying electron and nuclear dynamics, via reconstruction of a propagator that quantifies the time evolution of a sy…
Crystallographic refinement of collective excitations using standing wave inelastic x-ray scattering
Yu Gan, Anshul Kogar, Peter Abbamonte
We propose a method for realizing true, real-space imaging of charge dynamics in a periodic system, with angstrom spatial resolution and attosecond time resolution. In this method,…
First-principles method of propagation of tightly bound excitons: exciton band structure of LiF and verification with inelastic x-ray scattering
Chi-Cheng Lee, Xiaoqian M. Chen, Yu Gan +4
We propose a simple first-principles method to describe propagation of tightly bound excitons. By viewing the exciton as a composite object (an effective Frenkel exciton in Wannier…
The electron many-body problem in graphene
Bruno Uchoa, James P. Reed, Yu Gan +4
We give a brief summary of the current status of the electron many-body problem in graphene. We claim that graphene has intrinsic dielectric properties which should dress the inter…
The effective fine structure constant of freestanding graphene measured in graphite
James P. Reed, Bruno Uchoa, Young Il Joe +4
Electrons in graphene behave like Dirac fermions, permitting phenomena from high energy physics to be studied in a solid state setting. A key question is whether or not these Fermi…
Two-step stabilization of orbital order and the dynamical frustration of spin in the model charge-transfer insulator KCuF3
James C. T. Lee, Shi Yuan, Siddhartha Lal +9
We report a combined experimental and theoretical study of KCuF3, which offers - because of this material's relatively simple lattice structure and valence configuration (d9, i.e.,…
Implicit spatial averaging in inversion of inelastic x-ray scattering data
P. Abbamonte, J. P. Reed, Y. I. Joe +2
Inelastic x-ray scattering (IXS) now a widely used technique for studying the dynamics of electrons in condensed matter. We previously posed a solution to the phase problem for IXS…