COPPER ACCEPTORS IN UNIAXIALLY STRESSED GERMANIUM - 1S(3) TO 1S(2) 2S(1) GROUND-STATE TRANSFORMATION

Authors
DUBON OD BEEMAN JW FALICOV LM FUCHS HD HALLER EE WANG C
Citation
Od. Dubon et al., COPPER ACCEPTORS IN UNIAXIALLY STRESSED GERMANIUM - 1S(3) TO 1S(2) 2S(1) GROUND-STATE TRANSFORMATION, Physical review letters, 72(14), 1994, pp. 2231-2234
Citations number
15
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
14
Year of publication
1994
Pages
2231 - 2234
Database
ISI
SICI code
0031-9007(1994)72:14<2231:CAIUSG>2.0.ZU;2-R
Abstract
We have studied uniaxially stressed Ge doped with Cu, a substitutional triple acceptor, by photoconductivity spectroscopy. We find that the ground state of this triple acceptor, normally accommodating three 1s holes, reconfigures into an atomic Li-like 1s(2)2s1 arrangement by the application of [100] stress. Above 4 kbar the first ionization potent ial reaches a constant value of 17.4 meV corresponding to the hole exc itation from the now partially occupied 2s energy level. Excellent agr eement was obtained between the experimental results and variational c alculations.