One-dimensional conduction on the cleaved edge of inasquantum wells

The cleaved edge of a GaAlSb/InAs/GaAlSb heterostructure contains a surface channel of accumulated electrons with the channel width given by the thickness of the InAs well. We achieved such structures and studied the temperature and magnetic-field dependence of the resistance along this edge. A strong negative magnetoresistance and well defined conductance fluctuations were observed, which were interpreted consistently by one-dimensional electron conduction. © 1992 The Japan Society of Applied Physics.