Quantum wire fabrication from compensating-layer GaAsAlGaAs heterostructures
Nanoscale devices are fabricated from modulation-doped GaAsAlGaAs heterostructures, where the two-dimensional electron system is initially depleted. Upon removing the p-type capping layer that compensates for the n-type supply layer the electron system is induced. Quantum wire structures and conducting areas as leads are formed by patterning a thin resist layer with an atomic force microscope and subsequent selective wet etching. At the electrical characteristics of a quantum point contact and a 250-nm long quantum wire exhibit quantized ballistic conductance.
quantum wire gaasalgaas quantum point contact nanolithography quantized conductance afm-lithography