Interplay between Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in phase-pure GaAs/InAs core/shell nanowires of different lengths

Farah Basarić; Kaiwen Wang; Tudor-Gabriel Dumitru; Andrei Manolescu; Francisco Alvarado Cesar; Ana M. Sanchez; Christoph Krause; Detlev Grützmacher; Alexander Pawlis; Thomas Schäpers

arXiv · 2606.10788

Interplay between Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in phase-pure GaAs/InAs core/shell nanowires of different lengths

Farah Basarić·Kaiwen Wang·Tudor-Gabriel Dumitru·Andrei Manolescu·Francisco Alvarado Cesar·Ana M. Sanchez·Christoph Krause·Detlev Grützmacher·Alexander Pawlis·Thomas Schäpers

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Abstract

In GaAs/InAs core/shell nanowires, comprising a tubular conducting shell, interference phenomena observed under an axial field and originating from closed-loop states encircling the insulating core, provide an ideal platform for superconducting quantum devices that utilize effects such as Aharonov--Bohm or Altshuler--Aronov--Spivak-type conductance oscillations. Both effects are different in nature with respect to phase rigidity because of interference of non-time-reversed or time-reversed paths, respectively. Since their occurrence is largely governed by averaging effects, which depend on sample dimensions and the transport regime, we present a systematic study of flux-periodic oscillations of phase-pure zinc-blende GaAs/InAs core/shell nanowires as a function of gate voltage for samples with different contact separation lengths. Our analysis shows that with increasing contact separation length, averaging effects result in gradual reduction of $h/e$-periodic Aharonov--Bohm-type oscillations, while the $h/2e$-periodic Altshuler--Aronov--Spivak oscillations and its $h/4e$-periodic higher harmonics are enhanced. The additional phase rigidity seen in the $h/3e$-periodic oscillations is attributed to phase rigidity propagating from the neighbouring lower harmonics. Our tight-binding transport simulations on nanowires of different lengths which contain only a few scattering centers confirm the experimental observations regarding the different harmonics and their phase rigidity. Together, our experimental and simulation findings indicate quasi-ballistic transport with persistent Aharonov--Bohm-, and phase-rigid Altshuler--Aronov--Spivak-type oscillations despite few scattering centers.

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Farah Basarić, Kaiwen Wang, Tudor-Gabriel Dumitru, Andrei Manolescu, Francisco Alvarado Cesar, Ana M. Sanchez, Christoph Krause, Detlev Grützmacher, Alexander Pawlis, Thomas Schäpers. 2026-06-09. Interplay between Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in phase-pure GaAs/InAs core/shell nanowires of different lengths. https://arxiv.org/abs/2606.10788

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