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

被引：59

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 50 条

[21] Kondo and Fano effect in side attached double quantum-dot molecule
Lara, Gustavo A.
Orellana, Pedro A.
Yanez, Julio M.
Anda, Enrique V.
[J]. BRAZILIAN JOURNAL OF PHYSICS, 2006, 36 (3B) : 820 - 823
[22] Fano-Kondo effect in side-coupled double quantum dot
Tamura, Hiroyuki
Sasaki, Satoshi
[J]. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 2010, 42 (04): : 864 - 867
[23] From SU(4) to SU(2) Kondo effect in a double quantum dot
Chudnovskiy, Alexander L.
[J]. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 2006, 34 (1-2): : 385 - 388
[24] Kondo effect in the transport through a quantum dot: Extended noncrossing approximation approach
Gerace, D
Pavarini, E
Andreani, LC
[J]. ACTA PHYSICA POLONICA B, 2003, 34 (02): : 633 - 636
[25] Kondo tunneling through a biased double quantum dot
Avishai, Y
Kikoin, K
[J]. ELECTRONIC CORRELATIONS: FROM MESO- TO NANO-PHYSICS, 2001, : 11 - 16
[26] Pseudospin Kondo correlations versus hybridized molecular states in double quantum dots
Holleitner, AW
Chudnovskiy, A
Pfannkuche, D
Eberl, K
Blick, RH
[J]. PHYSICAL REVIEW B, 2004, 70 (07): : 075204 - 1
[27] Cotunneling and Kondo-type transport of a quantum dot
Xiong, SJ
[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2000, 14 (17): : 1743 - 1752
[28] Kondo screening cloud in a double quantum dot system
Simon, P
[J]. PHYSICAL REVIEW B, 2005, 71 (15)
[29] Orbital and spin Kondo effects in a double quantum dot
Pohjola, T
Schoeller, H
Schön, G
[J]. EUROPHYSICS LETTERS, 2001, 54 (02): : 241 - 247
[30] The nonlinear conductance of a double quantum dot in the Kondo regime
Ivanov, T
[J]. EUROPHYSICS LETTERS, 1997, 40 (02): : 183 - 188

← 1 2 3 4 5 →