Probing Insulator-quantum Hall Transitions by Current Heating

被引：4

作者：

Chen, Kuang Yao ^{[1
]}

Liang, C. -T. ^{[1
]}

Aoki, N. ^{[2
]}

Ochiai, Y. ^{[2
]}

Cheng, K. A. ^{[3
]}

Lin, Li-Hung ^{[4
]}

Huang, C. F. ^{[6
]}

Li, Yu-Ru ^{[1
]}

Tseng, Yen Shung ^{[1
]}

Yang, Chun-Kai ^{[1
]}

Lin, Po-Tsun ^{[4
]}

Wu, Jau-Yang ^{[5
]}

Lin, Sheng-Di ^{[5
]}

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[2] Chiba Univ, Dept Elect & Mech Engn, Chiba 263, Japan

[3] Lung Hwa Univ Sci & Technol, Dept Elect Engn, Tao Yuan 333, Taiwan

[4] Natl Chiayi Univ, Grad Inst Optoelect & Solid State Elect, Chiayi 600, Taiwan

[5] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu 300, Taiwan

[6] Ind Technol Res Inst, Ctr Measurement Stand, Natl Measurement Lab, Hsinchu, Taiwan

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2009年 / 55卷 / 01期

关键词：

Insulator-quantum Hall transition; Current heating; Two-dimensional electron system; 2-DIMENSIONAL ELECTRON-SYSTEM; FIELD-INDUCED DELOCALIZATION; INELASTIC-SCATTERING; ENERGY RELAXATION; PHONON EMISSION; WELL STRUCTURE; CONDUCTOR; GAS;

D O I：

10.3938/jkps.55.64

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a magneto-transport study on the two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. The direct insulator to quantum Hall conductor transition is observed at low temperatures by increasing the magnetic field B perpendicular to the 2DES. We can also observe the transition by varying the current I and find a relation T(e) similar to I(a) between electron effective temperature T(e) and current. Here, a denotes the exponent for the power law. The exponent a, however, can have different values on the two sides of the transition point, which indicates different inelastic scattering mechanisms in the low-field insulator and in the quantum Hall conductor.

引用

页码：64 / 67

页数：4

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