title: Adiabatic Edge Channel Transport in a Nanowire Quantum Point Contact Register.
abstract: 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.
authors.affiliation: Peter Grünberg Institut (PGI-9) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich , 52425 Jülich, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Heedt
authors.affiliation: School of Science and Engineering, Reykjavik University , IS-101 Reykjavik, Iceland.
authors.forename: A
authors.initials: A
authors.lastname: Manolescu
authors.affiliation: Faculty of Physics, MDEO Research Center, University of Bucharest , 077125 Magurele-Ilfov, Romania.|Horia Hulubei National Institute of Physics and Nuclear Engineering , 077126 Magurele-Ilfov, Romania.
authors.forename: G A
authors.initials: GA
authors.lastname: Nemnes
authors.affiliation: Solid State Electronics Department, University of Duisburg-Essen , 47057 Duisburg, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Prost
authors.affiliation: Peter Grünberg Institut (PGI-9) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich , 52425 Jülich, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Schubert
authors.affiliation: Peter Grünberg Institut (PGI-9) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich , 52425 Jülich, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Grützmacher
authors.affiliation: Peter Grünberg Institut (PGI-9) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich , 52425 Jülich, Germany.
authors.forename: Th
authors.initials: T
authors.lastname: Schäpers
keywords: Adiabatic transport; InAs nanowire; Shubnikov−de Haas effect; edge channels; quantum point contacts