Transient current spectroscopy of a quantum dot in the Coulomb blockade regime

被引：100

作者：

Fujisawa, T

Tokura, Y

Hirayama, Y

机构：

[1] NTT, Basic Res Labs, Atsugi, Kanagawa 2430198, Japan

[2] CREST, Kawaguchi 3310012, Japan

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.63.081304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transient current spectroscopy is proposed and demonstrated in order to investigate the energy relaxation inside a quantum dot in the Coulomb blockade regime. We employ a fast pulse signal to excite an AlGaAs/GaAs quantum dot to an excited state, and analyze the nonequilibrium transient current as a function of the pulse length. The amplitude and time constant of the transient current are sensitive to the ground and excited spin states. We find that the spin-relaxation time is longer than, at least, a few mus.

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页数：4

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