The Kondo effect in a one- and two-electron quantum dot

Satoshi Sasaki; Yoshitaka Kitamura; Wataru Izumida; Keiji Ono; Seigo Tarucha

doi:10.1016/S1386-9477(01)00431-3

The Kondo effect in a one- and two-electron quantum dot

Satoshi Sasaki, Yoshitaka Kitamura, Wataru Izumida, Keiji Ono, Seigo Tarucha

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S = 1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV. We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet (S = 0) to a triplet (S = 1) at a magnetic field of 3.2 T. The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.

Original language	English
Pages (from-to)	806-809
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	12
Issue number	1-4
DOIs	https://doi.org/10.1016/S1386-9477(01)00431-3
Publication status	Published - 2002 Jan
Event	14th International Conference on the - Prague, Czech Republic Duration: 2001 Jul 30 → 2001 Aug 3

Keywords

Kondo effect
Quantum dot
Zeeman splitting

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10.1016/S1386-9477(01)00431-3

Cite this

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abstract = "We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S = 1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV. We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet (S = 0) to a triplet (S = 1) at a magnetic field of 3.2 T. The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.",

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T1 - The Kondo effect in a one- and two-electron quantum dot

AU - Sasaki, Satoshi

AU - Kitamura, Yoshitaka

AU - Izumida, Wataru

AU - Ono, Keiji

AU - Tarucha, Seigo

PY - 2002/1

Y1 - 2002/1

N2 - We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S = 1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV. We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet (S = 0) to a triplet (S = 1) at a magnetic field of 3.2 T. The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.

AB - We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S = 1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV. We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet (S = 0) to a triplet (S = 1) at a magnetic field of 3.2 T. The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.

KW - Kondo effect

KW - Quantum dot

KW - Zeeman splitting

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U2 - 10.1016/S1386-9477(01)00431-3

DO - 10.1016/S1386-9477(01)00431-3

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SN - 1386-9477

VL - 12

SP - 806

EP - 809

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-4

T2 - 14th International Conference on the

Y2 - 30 July 2001 through 3 August 2001

ER -

The Kondo effect in a one- and two-electron quantum dot

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Keywords

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