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

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-11-11
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Language
en
Pages
1-4
Series
Applied Physics Letters, Volume 115, issue 20
Abstract
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.
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Yan , C , Pepper , M , See , P , Farrer , I , Ritchie , D A & Griffiths , J 2019 , ' Thermoelectric property of a one dimensional channel in the presence of a transverse magnetic field ' , Applied Physics Letters , vol. 115 , no. 20 , 202102 , pp. 1-4 . https://doi.org/10.1063/1.5128906