Density of States and de Haas—van Alphen Effect in Two-Dimensional Electron Systems

J. P. Eisenstein; H. L. Stormer; V. Narayanamurti; A. Y. Cho; A. C. Gossard; C. W. Tu

doi:10.1103/PhysRevLett.55.875

Density of States and de Haas—van Alphen Effect in Two-Dimensional Electron Systems

J. P. Eisenstein, H. L. Stormer, V. Narayanamurti, A. Y. Cho, A. C. Gossard, and C. W. Tu

Phys. Rev. Lett. 55, 875 – Published 19 August 1985

Abstract

The density of states of two-dimensional electron systems in GaAs/AlGaAs single-layer and multilayer heterostructures has been determined through measurements of the high-field magnetization. Our results reveal a substantial density of states between Landau levels, even in high-mobility single quantum wells. There is no existing theoretical explanation for this anomaly.