205 citations · 505 across the 11 of their papers we have counts for
11 papers
Theory of Optical Activity in Doped Systems with Application to Twisted Bilayer Graphene
K. Chang, Z. Zheng, J. E. Sipe +1
We theoretically study the optical activity in a doped system and derive the optical activity tensor from a light wavevector-dependent linear optical conductivity. Although the lig…
Third harmonic generation of undoped graphene in Hartree-Fock approximation
J. L. Cheng, J. E. Sipe, Chunlei Guo
We theoretically investigate the effects of Coulomb interaction, at the level of unscreened Hartree-Fock approximation, on third harmonic generation of undoped graphene in an equat…
Nonperturbative model for optical response under intense periodic fields with application to graphene in a strong perpendicular magnetic field
J. L. Cheng, C. Guo
Graphene exhibits extremely strong optical nonlinearity when a strong perpendicular magnetic field is applied, the response current shows strong field dependence even for moderate…
Nonlinear magneto-optic effects in doped graphene and gapped graphene: a perturbative treatment
J. L. Cheng, C. Guo
The nonlinear magneto-optic responses are investigated for gapped graphene and doped graphene in a perpendicular magnetic field. The electronic states are described by Landau level…
Third order nonlinearity of graphene: effects of phenomenological relaxation and finite temperature
J. L. Cheng, N. Vermeulen, J. E. Sipe
We investigate the effect of phenomenological relaxation parameters on the third order optical nonlinearity of doped graphene by perturbatively solving the semiconductor Bloch equa…
Disorder-induced significant enhancement in magnetization of ball-milled Fe2CrGa alloy
H. G. Zhang, C. Z. Zhang, W. Zhu +6
A new disordered atom configuration in Fe2CrGa alloy has been created by ball-milling method. This leads to a significant enhancement of the magnetic moment up to 3.2~3.9 μB and an…
Spin-dependent inter- and intra-valley electron-phonon scattering in germanium
Z. Liu, M. O. Nestoklon, J. L. Cheng +2
We investigate the spin-dependent electron-phonon scatterings of the and valleys and the band structure near the conduction band minima in germanium. We first construct a $…
Two-photon Indirect Optical Injection and Two-color Coherent Control in Bulk Silicon
J. L. Cheng, J. Rioux, J. E. Sipe
Using an empirical pseudopotential description of electron states and an adiabatic bond charge model for phonon states in bulk silicon, we theoretically investigate two-photon indi…
Theory of the spin relaxation of conduction electrons in silicon
J. L. Cheng, M. W. Wu, J. Fabian
A realistic pseudopotential model is introduced to investigate the phonon-induced spin relaxation of conduction electrons in bulk silicon. We find a surprisingly subtle interferenc…
Intense terahertz laser fields on a two-dimensional electron gas with Rashba spin-orbit coupling
J. L. Cheng, M. W. Wu
The spin-dependent density of states and the density of spin polarization of an InAs-based two-dimensional electron gas with the Rashba spin-orbit coupling under an intense teraher…
Spin relaxations in semiconductor quantum dots
J. L. Cheng, M. W. Wu, C. Lü
The spin relaxation time due to the electron-acoustic phonon scattering in GaAs quantum dots is studied after the exact diagonalization of the electron Hamiltonian with the spin-or…