Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot

被引：60

作者：

Amasha, S. ^{[1
]}

Keller, A. J. ^{[1
]}

Rau, I. G. ^{[2
]}

Carmi, A. ^{[3
]}

Katine, J. A. ^{[4
]}

Shtrikman, Hadas ^{[3
]}

Oreg, Y. ^{[3
]}

Goldhaber-Gordon, D. ^{[1
,3
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[3] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-96100 Rehovot, Israel

[4] HGST, San Jose, CA 95135 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 04期

关键词：

FIELD;

D O I：

10.1103/PhysRevLett.110.046604

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the Kondo effect in a double quantum dot, where the orbital states act as pseudospin states whose degeneracy contributes to Kondo screening. Standard transport spectroscopy as a function of the bias voltage on both dots shows a zero-bias peak in conductance, analogous to that observed for spin Kondo in single dots. Breaking the orbital degeneracy splits the Kondo resonance in the tunneling density of states above and below the Fermi energy of the leads, with the resonances having different pseudospin character. Using pseudospin-resolved spectroscopy, we demonstrate the pseudospin character by observing a Kondo peak at only one sign of the bias voltage. We show that even when the pseudospin states have very different tunnel rates to the leads, a Kondo temperature can be consistently defined for the double quantum dot system. DOI: 10.1103/PhysRevLett.110.046604

引用

页数：5

共 31 条

[1] SU(4) Fermi liquid state and spin filtering in a double quantum dot system -: art. no. 026602 [J].