Spin-polarized transport in Rashba quantum point contacts

Tomohiro Kita, T. Kakegawa, M. Akabori, S. Yamada

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.

Original languageEnglish
Pages (from-to)464-467
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume22
Issue number1-3
DOIs
Publication statusPublished - 2004 Apr 1
Externally publishedYes
Event15th International Conference on ELectronic Propreties - Nara, Japan
Duration: 2003 Jul 142003 Jul 18

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Keywords

  • Conductance quantization
  • Quantum point contacts
  • Quantum wire
  • Spin-orbit interaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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