2005/02/21 by Akira Endo, Yasuhiro Iye · 2 citations
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1143/jpsj.74.1792
published as J. Phys. Soc. Jpn. 74, 1792 (2005) · 9 pages, 7 figures, LaTeX2e with jpsj2 class
arxiv created 2005/02/21 · openalex publication_date 2005/06/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The amplitude V0 of unidirectional periodic potential modulation introduced by a surface grating into a two-dimensional electron gas (2DEG) formed at AlGaAs/GaAs heterointerface is measured as a function of electron density ne by analyzing commensurability oscillation of the magnetoresistance. The electron density is varied either by applying a bias to a metallic back gate or by illumination. The amplitude decreases with increasing density, with the rate |dV0/dne| roughly an order of magnitude larger for the former method. The result is interpreted in terms of the rate, dE1/d(delta Ec), of the change in the first subband level E1 in response to the variation of the conduction-band edge delta Ec above the heterointerface. The rate crucially depends on the thickness of the 2DEG.