Cyclotron Resonance in High Magnetic Fields in Bi 2Se 3, Bi 2Te 3 and Sb 2Te 3 Based Crystals

We have investigated the energy band structure of single crystals of n-type Bi 2- x Sb x Se 3 (0.2 ≤ x ≤ 0.52), p-type In x Bi 2- x Te 3 (0 ≤ x ≤ 0.1) and p-type Sb 2 Te 1.2 Se 1.8 by cyclotron resonance in high magnetic fields up to 150 T. In n-type Bi 2- x Sb x Se 3 , two resonance peaks were observed corresponding to two conduction bands. Cyclotron masses have been determined for the upper and lower conduction bands for B ∥ c 3 . It was found that the both masses are independent of temperature and electron concentration. Cyclotron mass of the upper valence band has been also determined for p-type samples of In x Bi 2- x Te 3 (0 ≤ x ≤ 0.1) and Sb 2 Te 1.2 Se 1.8 for B ∥ c 3 .