Size-dependent Tunneling and Optical Spectroscopy of InAs Nanocrystal Quantum Dots

被引：0

作者：

O. Millo

D. Katz

Y. Levi

Y. W. Cao

U. Banin

机构：

[1] The Hebrew University,Racah Institute of Physics

[2] The Hebrew University,Department of Physical Chemistry

来源：

Journal of Low Temperature Physics | 2000年 / 118卷

关键词：

Spectroscopy; Electronic State; Magnetic Material; Surface State; Excellent Agreement;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Scanning tunneling spectroscopy is used to investigate singleInAs nanocrystals, 2 to 8 nm in diameter. The tunnelingcurrent-voltage characteristics exhibit a pronounced sizedependence of both single electron charging energy andquantum-confined electronic states. These are well describedusing the “Orthodox Model” for single electron tunnelingthrough a quantum dot with a discrete level structure. Quantumconfined states having atomic-like S and P symmetries aredirectly identified in the tunneling spectra as two andsixfold single electron charging multiplets, respectively. Thetunneling spectra acquired on un-passivated nanocrystals showclear evidence of sub-gap surface states. Surprisingly,excellent agreement is found between the strongly allowedoptical transitions and spacing of levels detected in thetunneling experiment.

引用

页码：365 / 373

页数：8

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