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

Abstract

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 non-equilibrium 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 microsecond.

5 pages, 3 figures

References in corpus (3)

• Spin relaxation in semiconductor quantum dots
• Kondo effect in an integer-spin quantum dot
• Charge noise analysis of an AlGaAs/GaAs quantum dot using transmission-type radio-frequency single-electron transistor technique

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