Hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au ohmic contacts

Abstract

The two-terminal magneto-conductance of a hole gas in C-doped AlGaAs/GaAs heterostructures with ohmic contacts consisting of alloyed In/Zn/Au displays a pronounced hysteresis of the conductance around zero magnetic field. The hysteresis disappears above magnetic fields of around 0.5 T and temperatures above 300 mK. For magnetic fields below 10 mT we observe a pronounced dip in the magneto-conductance. We tentatively discuss these experimental observations in the light of superconductivity of the ohmic contacts.

4+ pages, 3 figures;

References in corpus (3)

• Aharonov-Bohm oscillations in the presence of strong spin-orbit interactions
• Strong spin-orbit interactions and weak antilocalization in carbon doped p-type GaAs heterostructures
• Density and well width dependences of the effective mass of twodimensional holes in (100) GaAs quantum wells measured by cyclotron resonance at microwave frequencies