Observation of Degenerate
One-Dimensional Sub-Bands
in Cylindrical InAs Nanowires
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Abstract
One-dimensional (1D) sub-bands in cylindrical InAs nanowires
(NWs)
are electrically mapped as a function of NW diameter in the range
of 15–35 nm. At low temperatures, stepwise current increases
with the gate voltage are clearly observed and attributed to the electron
transport through individual 1D sub-bands. The 2-fold degeneracy in
certain sub-band energies predicted by simulation due to structural
symmetry is experimentally observed for the first time. The experimentally
obtained sub-band energies match the simulated results, shedding light
on both the energies of the sub-bands as well as the number of sub-bands
populated per given gate voltage and diameter. This work serves to
provide better insight into the electrical transport behavior of 1D
semiconductors