Asymmetry of charge relaxation times in quantum dots: The influence of degeneracy

被引：27

作者：

Beckel, A. ^{[1
,2
]}

Kurzmann, A. ^{[1
,2
]}

Geller, M. ^{[1
,2
]}

Ludwig, A. ^{[3
]}

Wieck, A. D. ^{[3
]}

Koenig, J. ^{[1
,2
]}

Lorke, A. ^{[1
,2
]}

机构：

[1] Univ Duisburg Essen, Fac Phys, D-47057 Duisburg, Germany

[2] Univ Duisburg Essen, CENIDE, D-47057 Duisburg, Germany

[3] Ruhr Univ Bochum, Lehrstuhl Angew Festkorperphys, D-44780 Bochum, Germany

来源：

EPL | 2014年 / 106卷 / 04期

关键词：

SPECTROSCOPY; STATES;

D O I：

10.1209/0295-5075/106/47002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using time-resolved transconductance spectroscopy, we study the tunneling dynamics between a two-dimensional electron gas (2DEG) and self-assembled quantum dots (QDs), embedded in a field-effect transistor structure. We find that the tunneling of electrons from the 2DEG into the QDs is governed by a different time constant than the reverse process, i. e., tunneling from the QDs to the 2DEG. This asymmetry is a clear signature of Coulomb interaction and makes it possible to determine the degeneracy of the quantum-dot orbitals even when the individual states cannot be resolved energetically because of inhomogeneous broadening. Our experimental data can be qualitatively explained within a master-equation approach. Copyright (C) EPLA, 2014

引用

页数：6

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