Energy-loss rate of a two-dimensional electron gas measured using a mesoscopic thermometer
Energy-loss rate of a two-dimensional electron gas measured using a mesoscopic thermometer
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使用介观温度计测量二维电子气的能量损失率
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
C. Sørensen
中科院分区：
文献类型：
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作者：
Y. Proskuryakov;J. Nicholls;D. I. Hadji;A. Kristensen;C. Sørensen
使用简单的设置，线性热电势在具有大的子带能量间隔的蚀刻的一维一维收缩中被测量，允许作为施加的加热功率的函数来确定收缩一侧的二维电子气的温度。经Cutler-Mott关系检验，在Tl=4.2-13K范围内，一维收缩是测量晶格温度的可靠电子温度计。测量的每电子耗散功率与电子温度的函数关系表明，在Tl=4.2K时，由于未屏蔽的形变势，声学声子散射主要由T5行为主导。在较高的晶格温度下，散射可以用Grüneisen-Bloch和均分区域之间的内插来描述。
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 TL =4.2–13 K. The power dissipated per electron, measured as a function of electron temperature, reveals that at TL=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 Grüneisen-Bloch and equipartition regimes.