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Investigations on a two‐valence band model for Sb 2 Te 3
Author(s) -
Simon G.,
Eichler W.
Publication year - 1981
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.2221070120
Subject(s) - valence band , condensed matter physics , valence (chemistry) , scattering , anisotropy , electronic band structure , physics , chemistry , band gap , materials science , optics , quantum mechanics
A two‐valence band model with a single‐and six‐valley structure is developed for the interpretation of galvanomagnetic effects in p‐type mixed crystals of the system (Bi x Sb 1− x ) 2 Te 3 (0 ≦ x ≦ 1), especially for x = 0 under the assumption of a purely anisotropic scattering in each band, neglecting interband and intervalley scattering. This model, refering to results from Shubnikov‐de Haas investigations on Sb 2 Te 3 at 4 K, is tested with galvanomagnetic data of undoped Sb 2 Te 3 in the temperature region 100 K ≦ T ≦ 360 K. It is, however, not possible to fit such a two‐valence band model to these data sufficiently well due, possibly, of a more complicated scattering process of charge carriers.