Spin-Landau Orbit Coupling in Units of the Flux Quantum Observed from Zeeman Splitting of a Quantum Wire Array

TL;DR

This paper reports the first observation of flux quantum units in spin-Landau orbit coupling within a quantum wire array, revealing gauge invariance effects through Zeeman spectra and quantum interference phenomena.

Contribution

It demonstrates quantized zero-field shifts in Zeeman spectra caused by spin-Landau orbit coupling, linked to flux quantum units, in a non-superconducting quantum wire array.

Findings

Zero-field shift increases in steps of (2 pi hbar/ e)lp^{-2}

Observation of flux quantization in a non-superconducting material

Quantum interference effects related to phase differences in scattering

Abstract

In Zeeman spectra of a GaAs-AlGaAs quantum wire array with superlattice period lp, the zero-field shift is found to increase in steps of (2 pi hbar/ e)lp^{-2} at the cyclotron radius Rc ~lp, lp/2, and lp/3. This shift, caused by spin-Landau orbit coupling and quantized in units of the flux quantum 2 pi hbar /e,is a manifestation of the gauge invariance, and the first observation of the flux quantization in a non-superconducting material.The quantum interference associated with the phase difference in the quantum barrier scattering is also reported.