Unusual spin properties of InP wurtzite nanowires revealed by Zeeman splitting spectroscopy

Abstract

In this study, we present a complete experimental and theoretical investigation of the fundamental exciton Zeeman splitting in wurtzite InP nanowires. We determined the exciton gyromagnetic factor, $g_{exc}$, by magneto-photoluminescence spectroscopy using magnetic fields up to 29 T. We found that $g_{exc}$ is strongly anisotropic with values differing in excess of 50\% between the magnetic field oriented parallel and perpendicular to the nanowire long axis. Furthermore, for magnetic fields oriented along the nanowire axis, $g_{exc}$ is nearly three times larger than in bulk zincblende InP and it shows a marked sublinear dependence on the magnetic field, a common feature to other non-nitride III-V wurtzite nanowires but not properly understood. Remarkably, this nonlinearity originates from only one Zeeman branch characterized by a specific type of light polarization. All the experimental findings are modeled theoretically by a robust approach combining the $k\cdot p$ method with the envelope function approximation and including the electron-hole interaction. We revealed that the nonlinear features arise due to the coupling between Landau levels pertaining to the A (heavy-hole like) and B (light-hole like) valence bands of the wurtzite crystal structure. This general behavior is particularly relevant for the understanding of the spin properties of several wurtzite nanowires that host the set for the observation of topological phases potentially at the base of quantum computing platforms.

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• Spintronics: Fundamentals and applications
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• Excitonic Stark effect in MoS${}_2$ monolayers
• Realistic multiband k.p approach from ab initio and spin-orbit coupling effects of InAs and InP in wurtzite phase
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• Optical Dielectric Functions of III-V Semiconductors in Wurtzite Phase
• Wurtzite spin lasers
• Mechanisms for strong anisotropy of in-plane g-factors in hole based quantum point contacts

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• Large exciton binding energies in MnPS${}_3$ as a case study of vdW layered magnet
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Common nonlinear features and spin-orbit coupling effects in the Zeeman splitting of novel wurtzite materials
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Vanishing Zeeman energy in a two-dimensional hole gas
• Exploring the Band Structure of Wurtzite InAs Nanowires Using Photocurrent Spectroscopy
• Landau-level composition of bound exciton states in magnetic field