arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1810.02232cond-mat.mes-hall
收藏

近藤量子点中的非对称量子噪声

Non-symmetrized quantum noise in a Kondo quantum dot

A. Crépieux, S. Sahoo, T. Q. Duong, R. Zamoum, M. Lavagna

摘要:

电流的波动提供了量子器件中电子动力学的信息。因此,理解量子点中这些波动的性质是至关重要的一步,因为这个系统是量子线路的基本组成部分。在这种情况下,我们开发了一个理论计算的量子噪声在有限频率的量子点连接到两个水库中存在的相互作用和任何对称的耦合到水库。该理论是在Keldysh非平衡格林函数技术的框架内发展起来的。我们建立了一个解析表达式的量子噪声在水库之间的各种传输幅度和一些有效的传输系数,我们定义。然后,我们研究了噪声作为点能级和偏置电压的函数。库仑相互作用在点和非对称耦合与水库的影响的特点。

英文摘要:

The fluctuations of electrical current provide information on the dynamics of electrons in quantum devices. Understanding the nature of these fluctuations in a quantum dot is thus a crucial step insofar as this system is the elementary brick of quantum circuits. In this context, we develop a theory for calculating the quantum noise at finite frequency in a quantum dot connected to two reservoirs in the presence of interactions and for any symmetry of the couplings to the reservoirs. This theory is developed in the framework of the Keldysh non-equilibrium Green function technique. We establish an analytical expression for the quantum noise in terms of the various transmission amplitudes between the reservoirs and of some effective transmission coefficient which we define. We then study the noise as a function of the dot energy level and the bias voltage. The effects of both Coulomb interactions in the dot and asymmetric couplings with the reservoirs are characterized.

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。

↑