Engel Hans-Andreas, Loss Daniel
Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Phys Rev Lett. 2004 Sep 24;93(13):136602. doi: 10.1103/PhysRevLett.93.136602. Epub 2004 Sep 22.
We analyze the frequency-dependent noise of a current through a quantum dot which is coupled to Fermi leads and which is in the Coulomb blockade regime. We show that the asymmetric shot noise, as a function of detection frequency, shows steps and becomes super-Poissonian. This provides experimental access to the quantum fluctuations of the current. We present an exact calculation of the noise for a single dot level and a perturbative evaluation of the noise in Born approximation (sequential tunneling regime but without Markov approximation) for the general case of many levels with charging interaction.
我们分析了通过与费米引线耦合且处于库仑阻塞 regime 中的量子点的电流的频率相关噪声。我们表明，作为检测频率函数的不对称散粒噪声呈现出台阶状并变为超泊松分布。这为电流的量子涨落提供了实验途径。我们给出了单个量子点能级噪声的精确计算，以及在存在充电相互作用的多能级一般情况下，在玻恩近似（顺序隧穿 regime 但无马尔可夫近似）中噪声的微扰评估。
