Energy-loss rate of a two-dimensional electron gas measured using a mesoscopic thermometer

Proskuryakov  YY; Nicholls  JT; Hadji-Ristic  DI

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Energy-loss rate of a two-dimensional electron gas measured using a mesoscopic thermometer

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Using a simple setup, the linear thermopower is measured in etched one-dimensional (1D) constrictions with large subband energy spacings, allowing the temperature of the two-dimensional electron gas on one side of the constriction to be determined as a function of the applied heating power. As tested by the Cutler-Mott relation, the 1D constriction acts as a reliable electron thermometer for lattice temperatures in the range T-L=4.2-13 K. The power dissipated per electron, measured as a function of electron temperature, reveals that at T-L=4.2 K the acoustic phonon scattering is dominated by T-5 behavior due to an unscreened deformation potential. At higher lattice temperatures the scattering can be described by an interpolation between the Gruneisen-Bloch and equipartition regimes.

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《Physical review, B. Condensed matter and materials physics》 |2007年第4期|5308-1-5308-6-0|共6页
作者
Proskuryakov YY; Nicholls JT; Hadji-Ristic DI;
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作者单位

Univ London, Dept Phys, Egham TW20 0EX, Surrey, England;

Niels Bohr Inst, Orsted Lab, DK-2100 Copenhagen, Denmark;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
关键词
TEMPERATURE-DEPENDENCE; POINT CONTACTS; MOBILITY; GAAS; HETEROSTRUCTURES; OSCILLATIONS; THERMOPOWER; CONDUCTANCE; RELAXATION; TRANSPORT;

Energy-loss rate of a two-dimensional electron gas measured using a mesoscopic thermometer

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