Appleyard, N J , Nicholls, James, Simmons, M Y , Tribe, W R and Pepper, M (1998) Thermometer for the 2D electron gas using 1D thermopower. Physical Review Letters, 81 (16).
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We measure the temperature of a 2D electron gas in GaAs from the thermopower of a one-dimensional ballistic constriction, using the Mott relation to confirm the calibration from the electrical conductance. Under hot electron conditions, this technique shows that the power loss by the electrons follows a T-5 dependence in the Gruneisen-Bloch regime, as predicted for acoustic phonon emission with a screened piezoelectric interaction. An independent measurement using conventional thermometry based on Shubnikov-de Haas oscillations gives a T-3 loss rate. We discuss reasons for this discrepancy.
This is a Submitted version This version's date is: 19/10/1998 This item is not peer reviewed
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