Effect of Pressure on the Energy Gap of Bi2Te3

Abstract

The effect of hydrostatic pressure on the energy gap of Bi2Te3 has been investigated in the pressure range one to 30 000 atm. From resistivity measurements as a function of temperature and pressure, it has been determined that the energy gap decreases from 0.171 ev at one atmosphere to 0.104 ev at 30 000 atm, corresponding to ∂Eg(0)/∂p=−2×10−6 ev/atm.