Imaging and spectroscopy of single InAs self-assembled quantum dots using ballistic electron emission microscopy

Rubin, M. E. ; Medeiros-Ribeiro, G. ; O'Shea, J. J. ; Chin, M. A. ; Lee, E. Y. ; Petroff, P. M. ; Narayanamurti, V. (1996) Imaging and spectroscopy of single InAs self-assembled quantum dots using ballistic electron emission microscopy Physical Review Letters, 77 (26). pp. 5268-5271. ISSN 0031-9007

[img]
Preview
PDF - Publisher Version
119kB

Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.77.526...

Related URL: http://dx.doi.org/10.1103/PhysRevLett.77.5268

Abstract

Single InAs self-assembled quantum dots buried spatially beneath a Au/GaAs interface are probed for the first time using the imaging and spectroscopic modes of ballistic electron emission microscopy (BEEM). BEEM images show enhanced current through each dot. Spectra taken with the tip positioned on a dot show shifted current thresholds when compared with the off dot spectra, which are essentially the same as those of Au on bulk GaAs. Shifts in the γ and L conduction band thresholds are attributed to strain in the GaAs cap layer. Fine structure below the γ threshold is consistent with resonant tunneling through zero-dimensional states within the quantum dots.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:30644
Deposited On:23 Dec 2010 12:58
Last Modified:17 May 2016 13:16

Repository Staff Only: item control page