Work

Quantum quench dynamics and population inversion in bilayer graphene

Year: 2010

Type: article

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 nonlinear 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 wave vectors close to the Dirac point. This could, at least, in principle, provide a coherent source of infrared radiation with tunable spectral properties (frequency and broadening). Cold atoms with quadratic band crossing exhibit the same dynamics.

Source: Physical Review B

DOI: 10.1103/physrevb.82.125441

Authors: Balázs Dóra, Eduardo V. Castro, Roderich Moessner

Institutions: Budapest University of Technology and Economics, Max Planck Institute for the Physics of Complex Systems, Consejo Superior de Investigaciones Científicas, Instituto de Ciencia de Materiales de Madrid

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W1968498614

FWCI: 0.771

Cites: 38

Cited by: 7

Related to: 10