Kondo effect in quantum dots with two orbitals and spin 1/2 - Crossover from SU(4) to SU(2) symmetry

被引：0
|
作者：
Eto, M [1 ]
机构：
[1] Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
来源：
REALIZING CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPINTRONICS | 2005年
关键词：
D O I：
10.1142/9789812701619_0070
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Kondo effect is theoretically studied in quantum dots with two orbitals and spin 1/2. We evaluate the Kondo temperature T-K as a function of energy difference A between the orbitals using the scaling method. We find that T-K is maximal around the degeneracy point (Delta = 0) and decreases with increasing vertical bar Delta vertical bar by a power law. This behavior of T-K is understood as a crossover from SU(4) to SU(2) Kondo effect. The calculated results agree with recent experimental results.
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页码：451 / 456
页数：6
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