Confined States of Individual Type-II GaSb/GaAs Quantum Rings Studied by Cross-Sectional Scanning Tunneling Spectroscopy
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- 作者：Rainer Timm ; Holger Eisele ; Andrea Lenz ; Lena Ivanova ; Vivien Vossebrger ; Till Warming ; Dieter Bimberg ; Ian Farrer ; David A. Ritchie ; Mario Dhne
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：October 13, 2010
- 年：2010
- 卷：10
- 期：10
- 页码：3972-3977
- 全文大小：396K
- 年卷期：v.10,no.10(October 13, 2010)
- ISSN：1530-6992
文摘
Combined cross-sectional scanning tunneling microscopy and spectroscopy results reveal the interplay between the atomic structure of ring-shaped GaSb quantum dots in GaAs and the corresponding electronic properties. Hole confinement energies between 0.2 and 0.3 eV and a type-II conduction band offset of 0.1 eV are directly obtained from the data. Additionally, the hole occupancy of quantum dot states and spatially separated Coulomb-bound electron states are observed in the tunneling spectra.