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arXiv 1709.03334cond-mat.mes-hall
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非零温度下的单粒子散粒噪声

Single-particle shot noise at non-zero temperature

Michael Moskalets

摘要:

如果温度为零,则注入到费米海表面的单个粒子的状态是纯态,如果温度为有限,则是混合态。此外,注入粒子的状态在零温度下与费米海的状态正交,而在非零温度下则不正交。注入粒子的量子态的这些变化可以使用当粒子一个接一个地通过透明量子点接触时产生的散粒噪声的温度依赖性来检测。即,与纯状态的噪声相比,抑制了由混合状态产生的散粒噪声。此外,在非零温度下,注入粒子与下伏费米海之间的相关性确实增强了散粒噪声。此外,注入粒子与来自量子点接触的另一输入通道的可能的热激发的反聚束确实抑制了散粒噪声。在这里,我详细分析这三种影响,这是负责的温度依赖性的散粒噪声,并讨论如何区分它们的实验。

英文摘要:

The state of a single particle injected onto the surface of the Fermi sea is a pure state if the temperature is zero and is a mixed state if the temperature is finite. Moreover, the state of an injected particle is orthogonal to the state of the Fermi sea at zero temperature, while it is not orthogonal at non-zero temperature. These changes in the quantum state of the injected particles can be detected using the temperature dependence of the shot noise that is generated when the particles one by one pass through a semitransparent quantum point contact. Namely, the shot noise produced by the mixed state is suppressed in comparison with the noise of the pure state. In addition, the correlations between the injected particles and the underlying Fermi sea, present at non-zero temperature, do enhance the shot noise. Furthermore, antibunching of injected particles with possible thermal excitations coming from another input channel of a quantum point contact does suppress shot noise. Here I analyze in detail these three effects, which are responsible for the temperature dependence of the shot noise, and discuss how to distinguish them experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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