Spin-Resolved Magneto-Tunneling and Giant Anisotropic g-Factor in Broken Gap InAs-GaSb Core–Shell Nanowires

• DOI: 10.1021/acs.nanolett.3c02559
• Publication Date: 2024-01-08T15:44:58Z
• Authors: Vito Clericò; Pawel Wójcik; Andrea Vezzosi; Mirko Rocci; Valeria Demontis; Valentina Zannier; Álvaro Díaz-Ferná...; Elena Díaz; Vittorio Bellani; Francisco Domíngu...; Enrique Diez; Lucia Sorba; Andrea Bertoni; Guido Goldoni; Francesco Rossella
• Keywords: InAs-GaSb; high magnetic field; spin-resolved transport; InAs-GaSb; Broken gap heterostructures; Core−shell nanowires; G-factor; High magnetic field; Magneto-transport; Spin-resolved transport; broken gap; magneto-tunneling; g-factor; InAs-GaSb; broken gap; core−shell nanowires; g-factor; high magnetic field; magneto-tunneling; spin-resolved transport; core−shell nanowire; 530; high magnetic field, spin-resolved transport, magneto-tunneling, g-factor, broken gap, InAs-GaSb, core−shell nanowires

We experimentally and computationally investigate the magneto-conductance across radial heterojunction of InAs-GaSb core–shell nanowires under a magnetic field, B, up to 30 T at temperatures in range 4.2–200 K. The observed double-peak negative differential conductance markedly blue-shifts with increasing B. doublet accounts for spin-polarized currents through Zeeman split channels InAs (GaSb) conduction (valence) band exhibits strong anisotropy respect B orientation marked temperature dependence. Envelope function approximation semiclassical (WKB) approach allow compute quantum states GaSb sections nanowire estimate B-dependent tunneling current broken-gap interface. Disentangling different magneto-transport thermally activated valence-to-valence transport current, we extract g-factor from spin-up spin-down dI/dV branch dispersion, revealing giant, strongly anisotropic excess 60 (100) (tilted) field configurations.