Interplay of mesoscopic and Kondo effects for transmission amplitude of few-level quantum dots

被引：12
作者：
Hecht, T. [1 ,2 ]
Weichselbaum, A. [1 ,2 ]
Oreg, Y. [3 ]
von Delft, J. [1 ,2 ]
机构：
[1] Univ Munich, Dept Phys, Arnold Sommerfeld Ctr Theoret Phys, D-80333 Munich, Germany
[2] Univ Munich, Ctr NanoSci, D-80333 Munich, Germany
[3] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 11期
基金：
美国国家科学基金会;
关键词：
ANDERSON MODEL; UNIVERSAL PHASE; SCATTERING; CONDUCTANCE; LAPSES;
D O I：
10.1103/PhysRevB.80.115330
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnitude and phase of the transmission amplitude of a multilevel quantum dot is calculated for the mesoscopic regime of level spacing large compared to level width. The interplay between Kondo correlations and the influence by neighboring levels is discussed. As in the single-level case, the Kondo plateaus of magnitude and phase disappear with increasing temperature. At certain gate voltages, "stationary" points are found at which the transmission phase is independent of temperature. Depending on the mesoscopic parameters of the adjacent levels (such as relative sign and magnitude of tunneling matrix elements), the stationary points are shifted to or repelled by the neighboring level.
引用
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页数：10
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