Adiabatic Edge Channel Transport in a Nanowire Quantum Point Contact Register

作者：Heedt S^*; Manolescu A; Nemnes G A; Prost W; Schubert J; Gruetzmacher D; Schaepers Th

来源：Nano Letters, 2016, 16(7): 4569-4575.

DOI：10.1021/acs.nanolett.6b01840

• Adiabatic transport
• quantum point contacts
• InAs nanowire
• edge channels
• Shubnikov-de Haas effect

We report on a prototype device geometry where a number of quantum point contacts are connected in series in a single quasi-ballistic InAs nanowire. At finite magnetic field the backscattering length is increased up to the micron-scale and the quantum point contacts are connected adiabatically. Hence, several input gates can control the outcome of a ballistic logic operation. The absence of backscattering is explained in terms of selective population of spatially separated edge channels. Evidence is provided by regular Aharonov-Bohm-type conductance oscillations in transverse magnetic fields, in agreement with magnetoconductance calculations. The observation of the Shubnikov-de Haas effect at large magnetic fields corroborates the existence of spatially separated edge channels and provides a new means for nanowire characterization.

• 出版日期2016-7