Direct measurement of the density of states of a two-dimensional electron gas

T. P. Smith; B. B. Goldberg; P. J. Stiles; M. Heiblum

doi:10.1103/PhysRevB.32.2696

Rapid Communication

Direct measurement of the density of states of a two-dimensional electron gas

T. P. Smith, B. B. Goldberg, P. J. Stiles, and M. Heiblum

Phys. Rev. B 32, 2696(R) – Published 15 August 1985

Abstract

We present a direct measurement of the density of states of a two-dimensional electron gas in a quantizing magnetic field. By measuring the magnetocapacitance of modulation-doped GaAs-(AlGa) As heterostructures at low frequencies, we have observed quantum oscillations resulting from changes in the density of states alone.