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

Research output: Contribution to journalArticlepeer-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 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.

Original languageEnglish
Pages (from-to)64-67
Number of pages4
JournalJournal of the Korean Physical Society
Volume55
Issue number1
DOIs
StatePublished - 1 Jul 2009

Keywords

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

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