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

[11] Electronic excitations of a single molecule contacted in a three-terminal configuration [J].

Osorio, Edgar A. ;

O'Neill, Kevin ;

Wegewijs, Maarten ;

Stuhr-Hansen, Nicolai ;

Paaske, Jens ;

Bjornholm, Thomas ;

van der Zant, Herre S. J. .

NANO LETTERS, 2007, 7 (11) :3336-3342

[12] Non-equilibrium singlet-triplet Kondo effect in carbon nanotubes [J].

Paaske, J. ;

Rosch, A. ;

Woelfle, P. ;

Mason, N. ;

Marcus, C. M. ;

Nygard, J. .

NATURE PHYSICS, 2006, 2 (07) :460-464

[13] Nonequilibrium transport through a Kondo dot:: Decoherence effects -: art. no. 155301 [J].

Paaske, J ;

Rosch, A ;

Kroha, J ;

Wölfle, P .

PHYSICAL REVIEW B, 2004, 70 (15) :155301-1

[14] Nonequilibrium transport through a Kondo dot in a magnetic field:: Perturbation theory -: art. no. 155330 [J].

Paaske, J ;

Rosch, A ;

Wölfle, P .

PHYSICAL REVIEW B, 2004, 69 (15) :155330-1

[15]

Parcollet O, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.085315

[16] QUANTUM FIELD-THEORETICAL METHODS IN TRANSPORT-THEORY OF METALS [J].

RAMMER, J ;

SMITH, H .

REVIEWS OF MODERN PHYSICS, 1986, 58 (02) :323-359

[17] Quantum phase transition in a single-molecule quantum dot [J].

Roch, Nicolas ;

Florens, Serge ;

Bouchiat, Vincent ;

Wernsdorfer, Wolfgang ;

Balestro, Franck .

NATURE, 2008, 453 (7195) :633-U3

[18] The Kondo effect in non-equilibrium quantum dots:: Perturbative renormalization group [J].

Rosch, A ;

Paaske, J ;

Kroha, J ;

Wölfle, P .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2005, 74 (01) :118-126

[19] Nonequilibrium transport through a Kondo dot in a magnetic field:: Perturbation theory and poor man's scaling -: art. no. 076804 [J].

Rosch, A ;

Paaske, J ;

Kroha, J ;

Wölfle, P .

PHYSICAL REVIEW LETTERS, 2003, 90 (07) :4

[20] RELATION BETWEEN ANDERSON AND KONDO HAMILTONIANS [J].

SCHRIEFFER, JR ;

WOLFF, PA .

PHYSICAL REVIEW, 1966, 149 (02) :491-+

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