Evidence for composite fermions from the magnetothermopower of 2D holes

SURFACE SCIENCE

卷:361

Article; Proceedings Paper

Crump, PA ; Tieke, B ; Barraclough, RJ ; Gallagher, BL ; Fletcher, R ; Maan, JC ; Fromhold, TM ; Henini, M

关键词: electrical transport measurements;    gallium arsenide;    heterojunctions;    magnetic measurements;    quantum effects;    semiconductor-semiconductor heterostructures;   

DOI  :  10.1016/0039-6028(96)00328-7

来源: Elsevier

【 摘 要 】

Magnetothermopower measurements of high-mobility 2D hole gases are shown to provide strong evidence for a composite fermion Fermi surface at Landau level filling factor nu=1/2. Novel behaviour at fractional filling factors 1/3 and 2/3 are also observed with thermopower minima evolving into maxima with increasing temperature. This is interpreted in terms of the strong screening of the high-mass composite fermions.

【 授权许可】

Free