標題: Probing Insulator-quantum Hall Transitions by Current Heating
作者: 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
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Insulator-quantum Hall transition;Current heating;Two-dimensional electron system
公開日期: 1-Jul-2009
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.
URI: http://dx.doi.org/10.3938/jkps.55.64
http://hdl.handle.net/11536/27565
ISSN: 0374-4884
DOI: 10.3938/jkps.55.64
期刊: JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume: 55
Issue: 1
起始頁: 64
結束頁: 67
Appears in Collections:Conferences Paper