Adiabatic Edge Channel Transport in a Nanowire Quantum Point Contact Register.
Nano Lett
; 16(7): 4569-75, 2016 07 13.
Article
em En
| MEDLINE
| ID: mdl-27347816
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.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2016
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Article