Quantum quench dynamics and population inversion in bilayer graphene

Details Quantum quench dynamics and population inversion in bilayer graphene Quantum quench dynamics and population inversion in bilayer graphene

2010-04-21

arxiv.org/abs/1004.3757v2

Phys. Rev. B 82, 125441 (2010), as published

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 2 figures, 1 table

Scientific paper

10.1103/PhysRevB.82.125441

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.

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