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


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
Pages (from-to)139-151
Number of pages13
JournalPhysics of Low-Dimensional Structures
Publication statusPublished - 2002

ASJC Scopus subject areas

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

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