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Temperature and Coupling Strength Dependence of Polaron Effective Mass and Radius
Author(s) -
Fedyanin V. K.,
Rodriguez C.
Publication year - 1982
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221100112
Subject(s) - polaron , effective mass (spring–mass system) , radius , physics , generalization , coupling (piping) , effective radius , condensed matter physics , quantum mechanics , materials science , electron , mathematics , mathematical analysis , computer security , galaxy , computer science , metallurgy
Polaron effective mass and radius are investigated by using path integral methods. The calculations are performed in the framework of the variational principle for the free energy. At low temperatures, a generalization of Feynmans expression for the effective mass and an expression for the polaron radius at arbitrary coupling are obtained. It is shown that at low temperatures, the effective mass increases and the radius decreases with increasing temperatures. This behaviour of the effective mass agrees satisfactorily with cyclotron resonance experiments and is easily explained qualitatively.