TY - JOUR
T1 - Photostructural changes in glassy semiconductors
T2 - Franck-condon and relaxation transitions in negative-U centers
AU - Klinger, M. I.
AU - Halpern, V.
AU - Bass, F.
PY - 2002
Y1 - 2002
N2 - A consistent theory is presented of a mechanism for unusual photostructural changes observed in glassy semiconductors. The theory takes into account that in these materials negative-U centers are the basic charge carriers of which the electron ground state is formed by strong self-trapping of a singlet electron pair in a soft atomic mode in a glass. As a gap-light generated excited state of a negative-U center is related to a large atomic displacement in the soft mode, it is shown that metastable "defects" can indeed be created in the original structure. These are identified as the photostructural changes. The theory provides consistent answers to open basic questions. First calculations of the transition probabilities related to this phenomenon are presented.
AB - A consistent theory is presented of a mechanism for unusual photostructural changes observed in glassy semiconductors. The theory takes into account that in these materials negative-U centers are the basic charge carriers of which the electron ground state is formed by strong self-trapping of a singlet electron pair in a soft atomic mode in a glass. As a gap-light generated excited state of a negative-U center is related to a large atomic displacement in the soft mode, it is shown that metastable "defects" can indeed be created in the original structure. These are identified as the photostructural changes. The theory provides consistent answers to open basic questions. First calculations of the transition probabilities related to this phenomenon are presented.
UR - http://www.scopus.com/inward/record.url?scp=0035994585&partnerID=8YFLogxK
U2 - 10.1002/1521-3951(200203)230:1<39::AID-PSSB39>3.0.CO;2-J
DO - 10.1002/1521-3951(200203)230:1<39::AID-PSSB39>3.0.CO;2-J
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AN - SCOPUS:0035994585
SN - 0370-1972
VL - 230
SP - 39
EP - 45
JO - Physica Status Solidi (B): Basic Research
JF - Physica Status Solidi (B): Basic Research
IS - 1
ER -