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Non‐Parabolicity of the Highest Valence Band of Bi 2 Te 3 from Shubnikov‐de Haas Effect
Author(s) -
Köhler H.
Publication year - 1976
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.2220740218
Subject(s) - cyclotron , valence band , chemistry , effective mass (spring–mass system) , valence (chemistry) , quasi fermi level , condensed matter physics , atomic physics , shubnikov–de haas effect , physics , fermi surface , ion , band gap , quantum oscillations , superconductivity , quantum mechanics , organic chemistry
The valence band mass parameters are evaluated from the Shubnikov‐de Haas effect in stationary fields up to B = 10T magnetic induction. The hole concentrations of the samples ranged from 5 × 10 17 to 1.1 × 10 19 cm −3 . The ellipsoidal six‐valley model is confirmed, but in contradiction to earlier reported results the cyclotron masses depend on energy, though the shape of the Fermi surfaces does not vary with increasing oarrier concentration. The extrapolated band edge cyclotron mass for B parallel to the trigonal axis is 0.08% m 0 ± 5%, for the density‐of‐states mass of a single valley at the valence band top 0.106% m 0 ± 10% is obtained, which corresponds to the integral density‐of‐states mass at the band edge of 0.35% m 0 ± 10%. The tilt angle ν = 31.5° ± 10% of the ellipsoidal main axes relative to the crystal axes is higher than published earlier.