Uniaxial Stress Effect on Subsidiary Band Minima of GaSb from Zero Bias Conductance Anomaly

By means of the uniaxial compression along <111> and <110> directions, the magnitude of zero bias conductance anomaly (Z.B.A), Δ G / G 0 , was reduced. The inversion of (000) and (111) valleys due to compression was observed in Z.B.A. The stress coefficient of the energy separation between (000) and (111) valleys was determined; d ( Δ E )/ d χ 111 =(2.18±0.24)×10 -11 eV/dyn cm -2 . Using the hydro-static pressure coefficient d ( Δ E )/ d P =9.0×10 -12 eV/dyn cm -2 , the deformation potential constant u was obtained; u =(22.6±3.0) eV. The anomalous uniaxial stress effect on the tunneling peak current I p was found. From this result the deformation potential constant was again estimated in agreement with the value determined from Z.B.A measurements.