Beating of the shubnikov-de haas oscillations in GaAs/AlGaAs quantum-dot arrays

Yuichi Ochiai, Nobuyuki Aoki, Li Hung Lln, Anthony Andresen, Chetan Prasad, G. E. Fuding, Jonathan P. Bird, David K. Ferry, Tomomitu Risaki, Kohji Ishibashi, Yoshinobu Aoyagi, Takuo Sugano

Research output: Contribution to journalArticlepeer-review

Abstract

The Shubnikov-de Haas oscillations measured in split-gate quantum-dot arrays are found to exhibit a marked beating behavior, which we attribute to a carrier density variation between the quantum-point-contact leads and the component dots of the array. A simple analysis supports these arguments, revealing that the carrier density in the quantum point contacts vanishes as the array is pinched off. The beating may be suppressed by increasing the measurement current, a behavior which we attribute to the injection of energetic electrons in the source into initially unoccupied Landau levels in the quantum point contacts.

Original languageEnglish (US)
Pages (from-to)1990-1993
Number of pages4
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume40
Issue number3 B
DOIs
StatePublished - 2001

Keywords

  • Localization
  • Quantum dots
  • Quantum-dot arrays
  • Shubnikov-de haas effect

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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