Probing insulator-quantum hall transitions by current heating

Kuang Yao Chen; C. T. Liang; N. Aoki; Y. Ochiai; K. A. Cheng; Li Hung Lin; C. F. Huang; Yu Ru Li; Yen Shung Tseng; Chun Kai Yang; Po Tsun Lin; Jau Yang Wu; Sheng-Di Lin

doi:10.3938/jkps.55.64

Probing insulator-quantum hall transitions by current heating

Kuang Yao Chen, C. T. Liang, N. Aoki, Y. Ochiai, K. A. Cheng, Li Hung Lin, C. F. Huang, Yu Ru Li, Yen Shung Tseng, Chun Kai Yang, Po Tsun Lin, Jau Yang Wu, Sheng-Di Lin

Department of Electronics Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We report a magneto-transport study on the two-dimensional electron system (2DES) in an Al-GaAs/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 - 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.

Original language	English
Pages (from-to)	64-67
Number of pages	4
Journal	Journal of the Korean Physical Society
Volume	55
Issue number	1
DOIs	https://doi.org/10.3938/jkps.55.64
State	Published - 1 Jul 2009

Keywords

Current heating
Insulator-quantum hall transition
Two-dimensional electron system

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10.3938/jkps.55.64

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title = "Probing insulator-quantum hall transitions by current heating",

abstract = "We report a magneto-transport study on the two-dimensional electron system (2DES) in an Al-GaAs/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 Te - Ia between electron effective temperature Te 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.",

keywords = "Current heating, Insulator-quantum hall transition, Two-dimensional electron system",

author = "Chen, {Kuang Yao} and Liang, {C. T.} and N. Aoki and Y. Ochiai and Cheng, {K. A.} and Lin, {Li Hung} and Huang, {C. F.} and Li, {Yu Ru} and Tseng, {Yen Shung} and Yang, {Chun Kai} and Lin, {Po Tsun} and Wu, {Jau Yang} and Sheng-Di Lin",

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Probing insulator-quantum hall transitions by current heating. / Chen, Kuang Yao; Liang, C. T.; Aoki, N.; Ochiai, Y.; Cheng, K. A.; Lin, Li Hung; Huang, C. F.; Li, Yu Ru; Tseng, Yen Shung; Yang, Chun Kai; Lin, Po Tsun; Wu, Jau Yang; Lin, Sheng-Di.

In: Journal of the Korean Physical Society, Vol. 55, No. 1, 01.07.2009, p. 64-67.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Probing insulator-quantum hall transitions by current heating

AU - Chen, Kuang Yao

AU - Liang, C. T.

AU - Aoki, N.

AU - Ochiai, Y.

AU - Cheng, K. A.

AU - Lin, Li Hung

AU - Huang, C. F.

AU - Li, Yu Ru

AU - Tseng, Yen Shung

AU - Yang, Chun Kai

AU - Lin, Po Tsun

AU - Wu, Jau Yang

AU - Lin, Sheng-Di

PY - 2009/7/1

Y1 - 2009/7/1

N2 - We report a magneto-transport study on the two-dimensional electron system (2DES) in an Al-GaAs/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 Te - Ia between electron effective temperature Te 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.

AB - We report a magneto-transport study on the two-dimensional electron system (2DES) in an Al-GaAs/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 Te - Ia between electron effective temperature Te 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.

KW - Current heating

KW - Insulator-quantum hall transition

KW - Two-dimensional electron system

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