Thermoelectric property of a one dimensional channel in the presence of a transverse magnetic field

Research output: Contribution to journalArticleScientificpeer-review


  • Chengyu Yan
  • Michael Pepper
  • Patrick See
  • Ian Farrer
  • David A. Ritchie
  • Jonathan Griffiths

Research units

  • London Centre for Nanotechnology
  • University College London
  • National Physical Laboratory
  • University of Sheffield
  • Cavendish Laboratory


We studied the thermal conduction through a quantum point contact (QPC), defined in a GaAs- Al x Ga 1 - x As heterostructure, in the presence of a transverse magnetic field. A shift in the position of a thermo-voltage peak is observed with increasing field. The position of the thermo-voltage peak follows the Cutler-Mott relation in the small field regime (B < 0.5 T); it starts diverging from the Cutler-Mott relation in the moderate field regime, where a cubic magnetic field term dominates over the trivial quadratic term; eventually, the shift saturates in the large field regime (B > 3.0 T). Our results suggest that additional calibration is necessary when using QPC as thermometry, especially when the transverse magnetic field is applied.


Original languageEnglish
Article number202102
Pages (from-to)1-4
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 11 Nov 2019
MoE publication typeA1 Journal article-refereed

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