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A double acceptor binding three holes has been observed for the first time with photoconductive far-infrared spectroscopy in beryllium-doped germanium single crystals. This new center, Be/sup +/, has a hole binding energy of approx.5 meV and is only present when free holes are generated by ionization of either neutral shallow acceptors or neutral Be double acceptors. The Be/sup +/ center thermally ionizes above 4 K. It disappears at a uniaxial stress > or approx. =10/sup 9/ dyn cm/sup -2/ parallel to (111) as a result of the lifting of the valence-band degeneracy.

physical review letters

Three Holes Bound to a Double Acceptor:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in Germanium

Three Holes Bound to a Double Acceptor:Be+in Germanium