Thermopower study in a double bend quantum structure

A. V. Chernenko, R. W. Giannetta, D. Dombek, B. Kraczek, E. Ryan, D. Stoker, M. Hannan, A. Kuliev, I. Adesida, M. R. Melloch

Research output: Contribution to journalArticlepeer-review

Abstract

The thermopower and linear conductance of GaAs/AlGaAs double-bend structures are studied in quantizing magnetic fields up to 4 T at temperatures down to 0.4 K. The electrostatically defined structure consists of a square region with two quasi-one dimensional channels connected at opposite corners of the region. The presence of quasi-bound states was expected in the structure in the regime of ballistic transport. Using an electron-heating technique we observed noticeable oscillations of the thermopower as a function of the gate voltage near the pinchoff. We show, however, that they are related to variable-range hopping and resonant tunnelling via localized states inside the barrier. We also found that the Mort formula for thermopower worked well under our experimental conditions.

Original languageEnglish (US)
Pages (from-to)139-151
Number of pages13
JournalPhysics of Low-Dimensional Structures
Volume3-4
StatePublished - Jan 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

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