• 文献标题:   Two-dimensional electron gases: Theory of ultrafast dynamics of electron-phonon interactions in graphene, surfaces, and quantum wells
  • 文献类型:   Article, Proceedings Paper
  • 作  者:   RICHTER M, CARMELE A, BUTSCHER S, BUCKING N, MILDE F, KRATZER P, SCHEFFLER M, KNORR A
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF APPLIED PHYSICS
  • ISSN:   0021-8979
  • 通讯作者地址:   Tech Univ Berlin
  • 被引频次:   23
  • DOI:   10.1063/1.3117236
  • 出版年:   2009

▎ 摘  要

Many-particle electron-phonon interaction effects in two-dimensional electron gases are investigated within a Born-Markov approach. We calculate the electron-phonon interaction on a microscopic level to describe relaxation processes of quantum confined electrons on ultrafast time scales. Typical examples, where two-dimensional electron gases play a role, are surfaces and two-dimensional nanostructures such as graphene and quantum wells. In graphene, we find nonequilibrium phonon generation and ultrafast cooling processes after optical excitation. Electron relaxation dynamics at the silicon (001) 2 x 1 surface exhibits two time scales, corresponding to intrasurface and inside bulk-scattering processes. For GaAs quantum wells, we present broad emission spectra in the terahertz range assisted by LO-phonons of the barrier material. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3117236]