Tunable Pseudogap Kondo Effect and Quantum Phase Transitions in Aharonov-Bohm Interferometers

被引：29

作者：

Dias da Silva, Luis G. G. V. ^{[1
,2
]}

Sandler, Nancy ^{[3
]}

Simon, Pascal ^{[4
,5
,6
]}

Ingersent, Kevin ^{[7
]}

Ulloa, Sergio E. ^{[3
]}

机构：

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[3] Ohio Univ, Dept Phys & Astron, Nanoscale & Quantum Phenomena Inst, Athens, OH 45701 USA

[4] CNRS, Lab Phys & Modelisat Milieux Condenses, F-38042 Grenoble, France

[5] Univ Grenoble 1, F-38042 Grenoble, France

[6] Univ Paris 11, CNRS, UMR 8502, Phys Solides Lab, F-91405 Orsay, France

[7] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期

基金：

美国国家科学基金会;

关键词：

GAPLESS FERMI SYSTEMS; RENORMALIZATION-GROUP; MAGNETIC-IMPURITIES; ANDERSON; DOT; INTERFERENCE; DETECTOR;

D O I：

10.1103/PhysRevLett.102.166806

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study two quantum dots embedded in the arms of an Aharonov-Bohm ring threaded by a magnetic flux. This system can be described by an effective one-impurity Anderson model with an energy- and flux-dependent density of states. For specific values of the flux, this density of states vanishes at the Fermi energy, yielding a controlled realization of the pseudogap Kondo effect. The conductance and transmission phase shifts reflect a nontrivial interplay between wave interference and interactions, providing clear signatures of quantum phase transitions between Kondo and non-Kondo ground states.

引用

页数：4

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