LANDAU-LEVEL BROADENING AND VANHOVE SINGULARITIES IN LATERAL SURFACE SUPERLATTICES

被引：55

作者：

WEISS, D ^{[1
]}

VONKLITZING, K ^{[1
]}

PLOOG, K ^{[1
]}

WEIMANN, G ^{[1
]}

机构：

[1] TECH UNIV MUNICH,WALTER SCHOTTKY INST,W-8046 GARCHING,GERMANY

来源：

SURFACE SCIENCE | 1990年 / 229卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(90)90841-U

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A lateral periodic submicrometer potential in one direction superimposed on a two-dimensional electron gas (2DEG) lifts the degeneracy of the Landau levels (LL's) and leads to modulation broadened Landau bands. Due to the new band structure, singularities in the density of states (DOS) are expected which should result in a double peaked structure of the LL's (Van Hove singularities). Increasing the modulation amplitude of the periodic potential we observe a splitting of the Shubnikov-de Haas (SdH) maxima in magnetoresistance measurements which we believe to be the first observation of van Hove singularities in such modulated systems. In addition we report magnetotransport experiments in a weak two-dimensional periodic potential. © 1990.

引用

页码：88 / 91

页数：4

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