Quantum Magnetotransport in InGaAs/InP at High Magnetic Fields and Low Temperatures

• Authors: Gy. Kovacs , V. Novikov , G. Gombos , B. Podor , Gy. Remenyi
• Languages of publication: EN

Abstracts

EN

Quantum Hall effect and Shubnikov-de Haas effect measurements were made in two-dimensional electron gas in liquid phase epitaxially grown Ga_{0.47}In_{0.53}As/InP heterostructures in high magnetic fields in the temperature range from 4.2 K down to 60 mK. Two-dimensional electron gas concentrations and mobilities were in the range of (1 - 3) × 10^{11} cm^{-2} and (1 - 3) × 10^{4} cm^{2}/(V s), respectively. Corresponding to this the i = 1 quan­tum Hall effect plateau occurred at about 6 T magnetic field. Although fractional occupation numbers of about 0.3 were reached, no signs of frac­tional quantization were detected. Both current and frequency breakdown of the quantum Hall effect were investigated. Narrowing of the plateaus with increasing current differs from that measured in GaAs/AlGaAs structures because of the different mechanisms of dissipation. The fact that the mag­netic length becomes smaller than the characteristic scale of the disorder seems to be essential in understanding the low frequency breakdown via the presence of quasi-classical electron states.

Keywords

EN

73.20.Dx

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 2
• Pages: 473-476

Dates

published

1995-02

Contributors

author

Gy. Kovacs

• CNRS Centre de Recherches sur les Tres Basses Temperatures, Grenoble France
• Department of Low Temperature Physics, Eotvos Lorand University, Budapest, Hungary

author

V. Novikov

• A.F. Ioffe Physico-Technical Institute of the Russian Academy of Sciences, St. Petersburg, Russia

author

G. Gombos

• Research Institute for Technical Physics of the Hungarian Academy of Sciences, Budapest, Hungary

author

B. Podor

• Research Institute for Technical Physics of the Hungarian Academy of Sciences, Budapest, Hungary

author

Gy. Remenyi

• Research Institute for Technical Physics of the Hungarian Academy of Sciences, Budapest, Hungary

Identifiers

DOI

10.12693/APhysPolA.87.473