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Photogeneration of charged ferroelectric domains in quantum dielectric SrTiO3 by Y. Qiu; K. Nasu is a Materials Science article available to read on EtoBox.

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In connection with the recent experimental discoveries on photo-enhancements of the electronic conductivity and the quasi-static electric susceptibility in SrTiO 3 , we theoretically study a photogeneration mechanism of charged ferroelectric domains in this perovskite-type quantum dielectric. The photogenerated electron, being quite itinerant in the 3d band of Ti 4+ , is assumed to couple weakly but quadratically with soft-anharmonic T 1u phonons in this quantum dielectric. This photogenerated electron is also assumed to couple strongly but linearly with the breathing(A 1g ) type high-energy phonons. Using a discrete model, we will show that these two types of electron-phonon couplings result in two types of polarons, a ''super-para-electric large polaron'' with a quasi-global parity violation, and an ''off-center type self-trapped polaron'' with only a local parity violation. We will also show that this super-para-electric large polaron is nothing else but a singly charged (e À ) and conductive ferroelectric domain with a quasi-macroscopic size. This large polaron is also shown to aggregate with other same polarons, resulting in large bipolarons and their clusters.

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Author

Y. Qiu; K. Nasu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)

Published

2005

Language

EN

Field

Materials Science (Physical Sciences)