Thermometer for the 2D electron gas using 1D thermopower

被引：79

作者：

Appleyard, NJ ^{[1
]}

Nicholls, JT ^{[1
]}

Simmons, MY ^{[1
]}

Tribe, WR ^{[1
]}

Pepper, M ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.81.3491

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：3491 / 3494

页数：4

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