FLUX QUANTUM OSCILLATIONS IN GaAs/InAs CORE/SHELL NANOWIRES

摘要

Phase-based quantum devices are promising for future fast and low-power consumption nanoelectronics since electron interference might be used for the switching function. A robust operation of these devices necessitates nanoscale dimensions. The epitaxial growth of III/V nanowires opens unique possibilities for the realization of low dimensional structures by employing radial and axial heterostructures within the nanowire. Here we discuss the growth of GaAs/InAs core/shell nanowires as well as their magneto-transport properties. The InAs shell forms a tube shaped electron gas with coherent circular states. Magneto transport measurements with a magnetic field parallel to the axis of the nanowire exhibit oscillations in the conductivity with a periodicity of 1/Φ with Φ being the magnetic flux. It is shown that the oscillations can be explained by the number of coherent quantum states participating in the transport.