Quantum quench dynamics and population inversion in bilayer graphene
Mesoscale and Nanoscale Physics
2010-09-27 v2 Statistical Mechanics
Strongly Correlated Electrons
Abstract
The gap in bilayer graphene (BLG) can directly be controlled by a perpendicular electric field. By tuning the field through zero at a finite rate in neutral BLG, excited states are produced. Due to screening, the resulting dynamics is determined by coupled non-linear Landau-Zener models. The generated defect density agrees with Kibble-Zurek theory in the presence of subleading logarithmic corrections. After the quench, population inversion occurs for wavevectors close to the Dirac point. This could, at least in principle provide a coherent source of infra-red radiation with tunable spectral properties (frequency and broadening). Cold atoms with quadratic band crossing exhibit the same dynamics.
Cite
@article{arxiv.1004.3757,
title = {Quantum quench dynamics and population inversion in bilayer graphene},
author = {Balázs Dóra and Eduardo V. Castro and Roderich Moessner},
journal= {arXiv preprint arXiv:1004.3757},
year = {2010}
}
Comments
6 pages, 2 figures, 1 table