Many-body exciton states in self-assembled quantum dots coupled to a Fermi sea

被引：47

作者：

Kleemans, N. A. J. M. ^{[1
]}

van Bree, J. ^{[1
]}

Govorov, A. O. ^{[2
]}

Keizer, J. G. ^{[1
]}

Hamhuis, G. J. ^{[1
]}

Notzel, R. ^{[1
]}

Silov, A. Yu. ^{[1
]}

Koenraad, P. M. ^{[1
]}

机构：

[1] Eindhoven Univ Technol, COBRA, NL-5600 MB Eindhoven, Netherlands

[2] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

来源：

NATURE PHYSICS | 2010年 / 6卷 / 07期

基金：

美国国家科学基金会;

关键词：

SPECTRA;

D O I：

10.1038/NPHYS1673

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Many-body interactions give rise to fascinating physics such as the X-ray Fermi-edge singularity in metals, the Kondo effect in the resistance of metals with magnetic impurities and the fractional quantum Hall effect. Here we report the observation of striking many-body effects in the optical spectra of a semiconductor quantum dot interacting with a degenerate electron gas. A semiconductor quantum dot is an artificial atom, the properties of which can be controlled by means of a tunnel coupling between a metallic contact and the quantum dot. Previous studies concern mostly the regime of weak tunnel coupling, whereas here we investigate the regime of strong coupling, which markedly modifies the optical spectra. In particular we observe two many-body exciton states: Mahan and hybrid excitons. These experimental results open the route towards the observation of a tunable Kondo effect in excited states of semiconductors and are of importance for the technological implementation of quantum dots in devices for quantum information processing.

引用

页码：534 / 538

页数：5

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