Analysis of Possible Scattering Processes for Bloch Positronium in Ionic Crystals at Elevated Temperatures

• Authors: I. Bondarev
• Languages of publication: EN

Abstracts

EN

The role of nonpolar optic phonon scattering and of umklapp acoustic phonon scattering is analyzed for a delocalized positronium atom in ionic crystals at elevated temperatures. At temperatures above which they become essential both of these scattering mechanisms contribute to the imaginary self-energy of positronium renormalizing its acoustic deformation potential constant. It was such a renormalization that was recently observed experimentally for delocalized positronium in MgF_2 crystal. We put forward the theoretical explanation of these experiments based upon the model of nonpolar optic phonon scattering of positronium. An effect analogous to that observed in MgF_2 is predicted for crystalline quartz above the temperature of (α-β)-phase transition.

Keywords

EN

78.70.Bj; 71.60.+z; 71.38.+i; 36.10.Dr

Discipline

• 71.60.+z: Positron states(for positron annihilation, see 78.70.Bj)
• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 3-4
• Pages: 337-343

Dates

published

2001-03/04

received

2000-09-18

Contributors

author

I. Bondarev

• The Institute of Nuclear Problems, The Belarusian State University, Bobruiskaya Str. 11, 220050 Minsk, Belarus

References

• 1. J. Kasai, T. Hyodo, K. Fujiwara, J. Phys. Soc. Jpn., 57, 329, 1988 and refs. therein
• 2. I.V. Bondarev, T. Hyodo, Phys. Rev. B, 57, 11341, 1998
• 3. I.V. Bondarev, Phys. Rev. B, 58, 12011, 1998
• 4. Y. Nagai, M. Kakimoto, H. Ikari, T. Hyodo, Mater. Sci. Forum, 255-257, 596, 1997
• 5. Y. Nagai, M. Kakimoto, T. Hyodo, K. Fujiwara, H. Ikari, M. Eldrup, A. Stewart, Phys. Rev. B, 62, 5531, 2000
• 6. G.D. Mahan, Many-Particle Physics, Plenum, New York 1981
• 7. B.K. Ridley, Quantum Processes in Semiconductors, Clarendon, Oxford 1982
• 8. O.V. Boev, K.P. Arefiev, Izv. Vyssh. Uchebn. Zaved. Fiz., 25, 118, 1982 [Sov. Phys. J., 25, 37, 1982]
• 9. A.S. Davydov, Theory of Solids, Nauka, Moscow 1976 (in Russian)
• 10. I.V. Bondarev, Pis'ma Zh. Eksp. Teor. Fiz., 69, 215, 1999 [JETP Lett., 69, 231, 1999]
• 11. Y. Toyozawa, Prog. Theor. Phys., 26, 29, 1961
• 12. G.L. Bir, G.E. Pikus, Fiz. Tverd. Tela, 2, 2287, 1960 [Sov. Phys.-Solid State, 2, 2039, 1961]
• 13. G.L. Bir, G.E. Pikus, Symmetry and Deformation Effects in Semiconductors, Nauka, Moscow 1972 (in Russian)
• 14. K.S. Aleksandrov, L.A. Shabanova, V.I. Zinenko, Phys. Status. Solidi., 33, K1, 1969
• 15. American Institute of Physics Handbook, Ed. D.E. Gray, McGraw-Hill, New York 1972
• 16. M. Neuberger, Handbook of Electronic Materials, Plenum, New York 1971
• 17. Acoustic Crystals, Ed. M.P. Shaskolskaya, Nauka, Moscow 1982 (in Russian)

Identifiers

DOI

10.12693/APhysPolA.99.337