Nonequilibrium cotunneling through a three-level quantum dot

被引：8

作者：

Schmaus, S. ^{[4
]}

Koerting, V. ^{[1
]}

Paaske, J. ^{[2
,3
]}

Jespersen, T. S. ^{[2
,3
]}

Nygard, J. ^{[2
,3
]}

Wolfle, P. ^{[4
]}

机构：

[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[2] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[3] Univ Copenhagen, Nanosci Ctr, DK-2100 Copenhagen, Denmark

[4] Univ Karlsruhe, Inst Theorie Kondensierten Mat, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 04期

关键词：

Anderson model; Kondo effect; quantum dots; tunnelling;

D O I：

10.1103/PhysRevB.79.045105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We calculate the nonlinear cotunneling conductance through a quantum dot with three electrons occupying the three highest-lying energy levels. Starting from a three-orbital Anderson model, we apply a generalized Schrieffer-Wolff transformation to derive an effective Kondo model for the system. Within this model we calculate the nonequilibrium occupation numbers and the corresponding cotunneling current to leading order in the exchange couplings. We identify the inelastic cotunneling thresholds and their splittings with applied magnetic field, and make a qualitative comparison to recent experimental data on carbon nanotube and InAs quantum-wire quantum dots. Further predictions of the model such as cascade resonances and a magnetic-field dependence of the orbital level splitting are not yet observed but within reach of recent experimental work on carbon nanotube and InAs-nanowire quantum dots.

引用

页数：11

共 23 条

[1]

Abrikosov A. A., 1965, PHYSICS, V2, P5, DOI DOI 10.1103/PHYSICSPHYSIQUEFIZIKA.2.5

[2] Kondo effect in carbon nanotubes at half filling -: art. no. 235419 [J].

Babic, B ;

Kontos, T ;

Schönenberger, C .

PHYSICAL REVIEW B, 2004, 70 (23) :1-9

[3] A tunable Kondo effect in quantum dots [J].

Cronenwett, SM ;

Oosterkamp, TH ;

Kouwenhoven, LP .

SCIENCE, 1998, 281 (5376) :540-544

[4] Giant Fluctuations and Gate Control of the g-Factor in InAs Nanowire Quantum Dots [J].

Csonka, S. ;

Hofstetter, L. ;

Freitag, F. ;

Oberholzer, S. ;

Schoenenberger, C. ;

Jespersen, T. S. ;

Aagesen, M. ;

Nygard, J. .

NANO LETTERS, 2008, 8 (11) :3932-3935

[5] Kondo effect in a single-electron transistor [J].

Goldhaber-Gordon, D ;

Shtrikman, H ;

Mahalu, D ;

Abusch-Magder, D ;

Meirav, U ;

Kastner, MA .

NATURE, 1998, 391 (6663) :156-159

[6]

HAUG H., 1996, QUANTUM KINETICS TRA

[7] Gate-dependent tunneling-induced level shifts observed in carbon nanotube quantum dots [J].

Holm, J. V. ;

Jorgensen, H. I. ;

Grove-Rasmussen, K. ;

Paaske, J. ;

Flensberg, K. ;

Lindelof, P. E. .

PHYSICAL REVIEW B, 2008, 77 (16)

[8] Kondo physics in tunable semiconductor nanowire quantum dots [J].

Jespersen, Thomas Sand ;

Aagesen, Martin ;

Sorensen, Claus ;

Lindelof, Poul Erik ;

Nygard, Jesper .

PHYSICAL REVIEW B, 2006, 74 (23)

[9] Electron transport in the four-lead two-impurity Kondo model:: Nonequilibrium perturbation theory with almost degenerate levels [J].

Koerting, V. ;

Paaske, J. ;

Woelfle, P. .

PHYSICAL REVIEW B, 2008, 77 (16)

[10] Kondo physics in carbon nanotubes [J].

Nygård, J ;

Cobden, DH ;

Lindelof, PE .

NATURE, 2000, 408 (6810) :342-346

← 1 2 3 →