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| Home > Publications database > Quantum Transport in GaAs/InAs Core/Shell Nanowire Based Structures |
| Talk (non-conference) (Invited) | FZJ-2025-04106 |
2025
Abstract: Qubit systems based on high quality hybrid superconducting quantum devices are often realized by using semiconductor nanowires. In core/shell GaAs/InAs nanowires, containing a tubular conductor in the InAs shell wrapped around an insulating GaAs core, the strong confinement near the surface ensures good coupling to a superconductor. We present magnetotransport measurements on zincblende phase-pure GaAs/InAs core/shell nanowires, where the reduced disorder compared to polycrystalline nanowires is expected to result in improved transport properties. When an axial magnetic field is penetrating the tubular conductor, h/e-periodic Aharonov-Bohm type oscillations are observed in the magnetoconductance [1]. In addition, phase-rigid h/2e-periodic oscillations corresponding to Altshuler-Aronov-Spivak oscillations are observed. By temperature-dependent measurements, we identify a quasi-ballistic transport regime with few scattering centers in the conducting shell, which nevertheless leads to an Altshuler-Aronov-Spivak correction. In addition, Josephson junctions comprising a core/shell GaAs/InAs nanowire as a weak link were investigated [2,3]. Here, we observed an oscillation of the switching current in an axial magnetic field with a period of h/2e. Work done in collaboration with: F. Basaric, A. Pawlis, V. Brajovic, K. Moors, W. Schaarman, A. Manolescu, R. Deacon, K. Ishibashi, P. Zellekens, R. Juluri, A. M. Sanchez, J. H. Bae, H. Lüth, D. Grützmacher, M. D. Randle, P. Perla, M. I. Lepsa, G. Behner, E. Zimmermann, B. Bennemann, C. Krause[1] Farah Basaric, Vladan Brajovic, Gerrit Behner, Kristof Moors, William Schaarman, Andrei Manolescu, Raghavendra Juluri, Ana M. Sanchez, Jin Hee Bae, Hans Lüth, Detlev Grützmacher, Alexander Pawlis, Thomas Schäpers, Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in the quasiballistic regime in phase-pure GaAs/InAs core/shell nanowires, Phys. Rev. B. 112, 075301 (2025). [2] Patrick Zellekens, Russell Deacon, Pujitha Perla, Detlev Grützmacher, Mihail Ion Lepsa, Thomas Schäpers, Koji Ishibashi, Microwave spectroscopy of Andreev states in InAs nanowire-based hybrid junctions using a flip-chip layout, Communications Physics 5, 267 (2022).[3] Patrick Zellekens, Russell S. Deacon, Farah Basaric, Raghavendra Juluri, Michael D Randle, Benjamin Bennemann, Christoph Krause, Erik Zimmermann, Ana M. Sanchez, Detlev Grützmacher, Alexander Pawlis, Koji Ishibashi, Thomas Schäpers, Flux-periodic supercurrent oscillations in an Aharonov-Bohm-type nanowire Josephson junction, Communications Physics 8, 363 (2025).
Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)
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