Determination of the complex microwave photoconductance of a single quantum dot

H. Qin; F. Simmel; R. H. Blick; J. P. Kotthaus; W. Wegscheider; M. Bichler

doi:10.1103/PhysRevB.63.035320

Determination of the complex microwave photoconductance of a single quantum dot

H. Qin, F. Simmel, R. H. Blick, J. P. Kotthaus, W. Wegscheider, M. Bichler

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an Al_xGa_{1 − x}As/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot’s electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave-induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the nonlinear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows us to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.

Original language	English
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.63.035320
State	Published - 2 Jan 2001
Externally published	Yes

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abstract = "A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlxGa1 − xAs/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot{\textquoteright}s electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave-induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the nonlinear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows us to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.",

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AU - Simmel, F.

AU - Blick, R. H.

AU - Kotthaus, J. P.

AU - Wegscheider, W.

AU - Bichler, M.

PY - 2001/1/2

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N2 - A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlxGa1 − xAs/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot’s electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave-induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the nonlinear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows us to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.

AB - A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlxGa1 − xAs/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot’s electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave-induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the nonlinear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows us to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.

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Determination of the complex microwave photoconductance of a single quantum dot

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