PACS 71.38, 73.20.D, 74.80.D

Bipolarons in anisotropic crystals and low dimensional structures

N. I. Kashirina, E.V. Mozdor, E. A. Pashitskij, V. I. Sheka

Institute for Semiconductor Physics of NASU, 45, prospect Nauki, 252028 Kyiv, Ukraine

Semiconductor Physics, Quantum Electronics & Optoelectronics. 1999. V. 2, No 2. P.7-10. Eng. Il.: 3. Ref.:13

Abstract. We consider a simple bipolaron approach to description of anisotropic crystals in the strong- coupling limit. We have taken into account anisotropy of effective band masses and dielectric constants of crystals. The calculations of energy for two - electron system was fulfiled using wave functions chosen as a linear combination of gaussian orbitals, what enables us to easily estimate the electron correlation effects which can play a key role. Bipolaron formation should be quite possible in crystals with high-temperature superconductivity. We have considered an example of La2CuO4, in which there is a great anisotropy of effective masses and dielectric permittivities, where in the limiting case of the maximum anisotropy of effective masses the bipolaron binding energy is 25 % of the polaron energy.

Keywords: bipolarons, anisotropic crystals, superconductivity.

Paper received 04.06.99; revised manuscript received 24.06.99; accepted for publication 12.07.99.

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