Instituto de Modelado e Innovación Tecnológica, CONICET, and Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Avenida Libertad 5500 (3400) Corrientes, Argentina.
J Phys Condens Matter. 2011 Oct 26;23(42):425303. doi: 10.1088/0953-8984/23/42/425303. Epub 2011 Oct 4.
We study theoretically the transmission through a quantum dot molecule embedded in the arms of an Aharonov-Bohm four quantum dot ring threaded by a magnetic flux. The tunable molecular coupling provides a transmission pathway between the interferometer arms in addition to those along the arms. From a decomposition of the transmission in terms of contributions from paths, we show that antiresonances in the transmission arise from the interference of the self-energy along different paths and that application of a magnetic flux can produce the suppression of such antiresonances. The occurrence of a period of twice the quantum of flux arises at the opening of the transmission pathway through the dot molecule. Two different connections of the device to the leads are considered and their spectra of conductance are compared as a function of the tunable parameters of the model.
我们从理论上研究了嵌入在阿哈罗诺夫-玻姆（Aharonov-Bohm）四量子点环臂中的量子点分子对通过磁通的传输。可调谐的分子耦合除了沿臂的传输路径之外，还提供了干涉仪臂之间的传输途径。通过对路径贡献的分解，我们表明传输中的反共振是由不同路径上的自能干涉引起的，并且施加磁场可以抑制这种反共振。在通过点分子的传输途径打开时，会出现两倍量子通量的周期。考虑了该器件与引线的两种不同连接，并比较了它们的电导谱作为模型可调参数的函数。
