Observation of "partial coherence" in an Aharonov-Bohm interferometer with a quantum dot

被引：51

作者：

Aikawa, H ^{[1
]}

Kobayashi, K ^{[1
]}

Sano, A ^{[1
]}

Katsumoto, S ^{[1
]}

Iye, Y ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 17期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevLett.92.176802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report experiments on the interference through spin states of electrons in a quantum dot (QD) embedded in an Aharonov-Bohm (AB) interferometer. We have picked up a spin-pair state, for which the environmental conditions are ideally similar. The AB amplitude is traced in a range of gate voltage that covers the pair. The behavior of the asymmetry in the amplitude around the two Coulomb peaks agrees with the theoretical prediction that the spin-flip process in a QD is related to the quantum dephasing of electrons. These results constitute evidence of "partial coherence" due to an entanglement of spins in the QD and in the interferometer.

引用

页码：176802 / 1

页数：4

共 32 条

[1] SIGNIFICANCE OF ELECTROMAGNETIC POTENTIALS IN THE QUANTUM THEORY [J].

AHARONOV, Y ;

BOHM, D .

PHYSICAL REVIEW, 1959, 115 (03) :485-491

[2] AHARONOV-BOHM EFFECT AND ELECTRON CORRELATION IN QUANTUM DOTS [J].

AKERA, H .

PHYSICAL REVIEW B, 1993, 47 (11) :6835-6838

[3] Correlations and spin flips in tunneling through a quantum dot [J].

Akera, H .

PHYSICAL REVIEW B, 1999, 59 (15) :9802-9805

[4]

Averin D. V., 1991, MESOSCOPIC PHENOMENA

[5] Dephasing in electron interference by a 'which-path' detector [J].

Buks, E ;

Schuster, R ;

Heiblum, M ;

Mahalu, D ;

Umansky, V .

NATURE, 1998, 391 (6670) :871-874

[6]

GEFEN Y, CONDMAT0207440

[7] Phase evolution in a Kondo-correlated system [J].

Ji, Y ;

Heiblum, M ;

Sprinzak, D ;

Mahalu, D ;

Shtrikman, H .

SCIENCE, 2000, 290 (5492) :779-783

[8] Transmission phase of a quantum dot with Kondo correlation near the unitary limit [J].

Ji, Y ;

Heiblum, M ;

Shtrikman, H .

PHYSICAL REVIEW LETTERS, 2002, 88 (07) :4-766014

[9] Aharonov-Bohm oscillation and Coulomb oscillation in parallel quantum dots [J].

Katsumoto, S ;

Endo, A .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (12) :4086-4087

[10] Tuning of the Fano effect through a quantum dot in an Aharonov-Bohm interferometer [J].

Kobayashi, Kensuke ;

Aikawa, Hisashi ;

Katsumoto, Shingo ;

Iye, Yasuhiro .

2002, American Physical Society (88)

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