The Hofstadter energy spectrum for an interacting 2DEG

SURFACE SCIENCE

卷:361

Article; Proceedings Paper

Gudmundsson, V ; Gerhardts, RR

关键词: electron density, excitation spectra calculations;    gallium arsenide;    heterojunctions;    interface states;    magnetic phenomena;    many body and quasi-particle theories;    quantum effects;    superlattices;   

DOI  :  10.1016/0039-6028(96)00456-6

来源: Elsevier

【 摘 要 】

We studied the effects of the Coulomb interactions between electrons on the Hofstadter butterfly, which characterizes the subband structure of the Landau levels of a two-dimensional electron gas in a perpendicular homogeneous magnetic field and a periodic lateral superlattice potential. The interactions essentially preserve the intricate gap structure of the Hofstadter spectra, but with a lower symmetry that depends on the filling of the Landau bands. For short enough periods and strong enough modulation the miniband structure can be resolved in the thermodynamic density of states.

【 授权许可】

Free