OBSERVATION OF THE FRACTIONAL QUANTUM HALL-EFFECT UNDER HYDROSTATIC-PRESSURE

被引：13

作者：

MORAWICZ, NG

BARNHAM, KWJ

ZAMMIT, C

HARRIS, JJ

FOXON, CT

KUJAWINSKI, P

机构：

[1] PHILIPS RES LABS,REDHILL RH1 5HA,SURREY,ENGLAND

[2] POLISH ACAD SCI,HIGH PRESSURE RES CTR,PL-01142 WARSAW,POLAND

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.41.12687

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the first observation of the fractional quantum Hall effect (FQHE) under hydrostatic pressure. The FQHE has been observed at a range of two-dimensional electron-gas densities, ns, in a high-quality AlxGa1-xAs/GaAs heterostructure at temperatures between 0.28 and 1.2 K and at hydrostatic pressures of 1 bar, 1.4 kbar, 4.5 kbar, and 6.2 kbar. We observe an increase of the activation energies for the 5/3 and 7/5 fractional states with increasing pressure and a very strong enhancement of the 4/3 state both in xx and in the gradient of the Hall resistance dxy/dB. © 1990 The American Physical Society.

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页码：12687 / 12692

页数：6

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