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