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arXiv 1111.1591cond-mat.mes-hall
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与准一维干涉仪相连的窄二维电子气热浴中的噪声测温

Noise thermometry in narrow 2D electron gas heat baths connected to a quasi-1D interferometer

Sven S. Buchholz, Elmar Sternemann, Olivio Chiatti, Dirk Reuter, Andreas D. Wieck, Saskia F. Fischer

摘要:

热电压噪声测量进行,以确定在4.2和1.4 K浴温度的GaAs/AlGaAs异质结构的纳米图案化通道中的电子温度。两个狭窄的二维(2D)加热通道,接近过渡到一维(1D)制度,连接准一维量子干涉仪。根据直流电流加热的电子在一个加热通道,我们进行互相关噪声测量本地直接加热的通道和非本地在其他通道,这是间接加热的热电子扩散整个准一维连接。我们观察到相同的功能依赖于加热电流的热噪声。与更宽的2D系统相比,电子能量损失率的温度依赖性降低。在量子干涉仪中,我们展示了由于热电子从加热通道扩散到准一维系统中引起热梯度而引起的退相干。

英文摘要:

Thermal voltage noise measurements are performed in order to determine the electron temperature in nanopatterned channels of a GaAs/AlGaAs heterostructure at bath temperatures of 4.2 and 1.4 K. Two narrow two-dimensional (2D) heating channels, close to the transition to the one-dimensional (1D) regime, are connected by a quasi-1D quantum interferometer. Under dc current heating of the electrons in one heating channel, we perform cross-correlated noise measurements locally in the directly heated channel and nonlocally in the other channel, which is indirectly heated by hot electron diffusion across the quasi-1D connection. We observe the same functional dependence of the thermal noise on the heating current. The temperature dependence of the electron energy-loss rate is reduced compared to wider 2D systems. In the quantum interferometer, we show the decoherence due to the diffusion of hot electrons from the heating channel into the quasi-1D system, which causes a thermal gradient.

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