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Non‐Parabolic E ( k ) Relation of the Lowest Conduction Band in Bi 2 Te 3
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.2220730107
Subject(s) - condensed matter physics , cyclotron , effective mass (spring–mass system) , physics , electron , conduction band , fermi energy , density of states , electronic band structure , fermi level , atomic physics , nuclear physics , quantum mechanics
Electronic maw parameters of the lowest conduction band in Bi 2 Te 3 are determined from Shubnikov‐de Haas investigations in stationary magnetic fields up to B = 10.5 T induction. The electron concentrations ranged from about 2 × 10 17 to 2 × 10 19 cm −3 . In contradiction to earlier reported results the cyclotron masses of the six‐valley ellipsoidal energy surfaces depend on the Fermi energy at various doping levels of the samples, though the ellipsoidal shape of the Fermi surfaces (with invariable ratio of the main axis) remains unchanged. The extrapolated band edge cyclotron mass for B parallel to the trigonal axis is 0.06m 0 ± 5%, the density of states mass for one single valley at the conduction band edge amounts to 0.082m 0 ± 10%, which corresponds to an integral density of states mass of 0.27m 0 ± 10% at the band edge.