Journal
SOLID STATE COMMUNICATIONS
Volume 130, Issue 11, Pages 773-776Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2004.02.053
Keywords
quantum dot; donor binding; spin-orbit coupling
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The ground state and a few excited state energies of a hydrogenic donor in a spherical quantum dot (GaAs in a GaAlAs matrix) are computed. While the 1s and the 2s-state energies behave normally for dots of all radii, the 2p(0) and 2p(+/-) states are unbound for most of the radii of interest. It is predicted that a semiconductor quantum dot with a hydrogenic donor will exhibit photoconductivity for a low threshold wavelength similar to12 mum. The spin-orbit coupling gives a contribution of the order of 10(-5) meV for both 2p(0) and 2p(+/-) states. (C) 2004 Published by Elsevier Ltd.
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