Study on transverse modes of a quantum point contact under magnetic field

Y. Y. Lee, S. N. Ko, M. S. Lee, Y. H. Moon, J. H. Bae, S. J. Lee, M. H. Son, J. H. Oh, S. W. Hwang, D. Ahn

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The quantization of conductance in units of 2e 2/h of a quantum point contact (QPC) under low temperature, a narrow way formed in a two-dimensional electron gas (2DEG), has become a paradigm of mesoscopic physics. Devices defined by electrostatic gates in GaAs/AlGaAs 2DEGs display an extraordinary variety of spin related phenomena. Besides the usual conductance plateaus, QPCs show an extra plateau at ∼0.7(2e 2/h), believed to arise from electron-electron interactions. These plateaus disappear as temperature rise. We present the experimental results of temperature dependent disappearance. Under magnetic fields plateaus shift due to the Landau level. The numerical results using Green's function approach is also presented.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 30th International Conference on the Physics of Semiconductors, ICPS-30
Pages371-372
Number of pages2
DOIs
StatePublished - 2011
Event30th International Conference on the Physics of Semiconductors, ICPS-30 - Seoul, Korea, Republic of
Duration: 25 Jul 201030 Jul 2010

Publication series

NameAIP Conference Proceedings
Volume1399
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference30th International Conference on the Physics of Semiconductors, ICPS-30
Country/TerritoryKorea, Republic of
CitySeoul
Period25/07/1030/07/10

Keywords

  • green's function method
  • point contact
  • quantum

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