Abstract

GaAs/InAs core/shell nanowires with phase-pure zinc-blende structure were studied as a function of contact separation length to understand the interplay between h/e-periodic Aharonov–Bohm and h/2e-periodic Altshuler–Aronov–Spivak oscillations under axial magnetic field. The nanowires were grown by MBE using a self-catalyzed vapor-liquid-solid technique on pre-structured Si(111) substrates and then fabricated into gated transport devices. Magnetoconductance measurements across samples with contact separations from 300 nm to 2 µm show that longer devices suppress h/e-periodic oscillations and enhance h/2e and higher harmonics up to h/4e. Tight-binding Landauer–Büttiker simulations in KWANT for nanowires with a few scattering centers reproduce the observed harmonic content and phase rigidity, supporting quasi-ballistic transport.

Abstract

GaAs/InAs core/shell nanowires with phase-pure zinc-blende structure were studied as a function of contact separation length to understand the interplay between h/e-periodic Aharonov–Bohm and h/2e-periodic Altshuler–Aronov–Spivak oscillations under axial magnetic field. The nanowires were grown by MBE using a self-catalyzed vapor-liquid-solid technique on pre-structured Si(111) substrates and then fabricated into gated transport devices. Magnetoconductance measurements across samples with contact separations from 300 nm to 2 µm show that longer devices suppress h/e-periodic oscillations and enhance h/2e and higher harmonics up to h/4e. Tight-binding Landauer–Büttiker simulations in KWANT for nanowires with a few scattering centers reproduce the observed harmonic content and phase rigidity, supporting quasi-ballistic transport.

Abstract

GaAs/InAs core/shell nanowires with phase-pure zinc-blende structure were studied as a function of contact separation length to understand the interplay between h/e-periodic Aharonov–Bohm and h/2e-periodic Altshuler–Aronov–Spivak oscillations under axial magnetic field. The nanowires were grown by MBE using a self-catalyzed vapor-liquid-solid technique on pre-structured Si(111) substrates and then fabricated into gated transport devices. Magnetoconductance measurements across samples with contact separations from 300 nm to 2 µm show that longer devices suppress h/e-periodic oscillations and enhance h/2e and higher harmonics up to h/4e. Tight-binding Landauer–Büttiker simulations in KWANT for nanowires with a few scattering centers reproduce the observed harmonic content and phase rigidity, supporting quasi-ballistic transport.

Abstract

GaAs/InAs core/shell nanowires with phase-pure zinc-blende structure were studied as a function of contact separation length to understand the interplay between h/e-periodic Aharonov–Bohm and h/2e-periodic Altshuler–Aronov–Spivak oscillations under axial magnetic field. The nanowires were grown by MBE using a self-catalyzed vapor-liquid-solid technique on pre-structured Si(111) substrates and then fabricated into gated transport devices. Magnetoconductance measurements across samples with contact separations from 300 nm to 2 µm show that longer devices suppress h/e-periodic oscillations and enhance h/2e and higher harmonics up to h/4e. Tight-binding Landauer–Büttiker simulations in KWANT for nanowires with a few scattering centers reproduce the observed harmonic content and phase rigidity, supporting quasi-ballistic transport.