Observation of degenerate one-dimensional sub-bands in cylindrical InAs   nanowires
  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 two-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. 
Alexandra C. Ford, S. Bala Kumar, Rehan Kapadia, Jing Guo, and Ali   Javey
cond-mat.mes-hall cond-mat.mtrl-sci