The phase of Fano resonance in Aharonov-Bohm interferometer with a quantum dot embedded

被引：3
|
作者：
Xiong, YJ [1 ]
Liang, XT
机构：
[1] Ningbo Univ, Inst Modern Phys, Ningbo 315211, Peoples R China
[2] Ningbo Univ, Dept Phys, Ningbo 315211, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2005年 / 355卷 / 1-4期
关键词：
Aharonov-Bohm interferometer; quantum dot; Fano resonance; phase;
D O I：
10.1016/j.physb.2004.10.094
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We study the Fano effect of a closed Aharonov-Bohm mesoscopic interferometer, with a quantum dot embedded in one of the paths, in the presence of dephasing which is introduced by the Buttiker model. An exact analytic formula of conductance including dephasing factor is derived and can be written as an extended Fano form with a complex Fano parameter q. While the total conductance is unitary, the coherent part has broken unitarity due to dephasing, and thus has continuous phase shift. Our results agree with recent experimental measurements. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：216 / 221
页数：6
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