Aharonov-Bohm interference from coherent spin-polarized edge transport in Fe(Te,Se) superconducting rings

TL;DR

This paper demonstrates the coexistence of Aharonov-Bohm and Little-Parks oscillations in mesoscopic Fe(Te,Se) rings, revealing edge states consistent with topological superconductivity and persistent quantum interference effects.

Contribution

It provides experimental evidence of edge-state interference in a topological superconductor, combining Aharonov-Bohm and Little-Parks effects in mesoscopic rings.

Findings

Observation of $h/e$ and $h/2e$ oscillations in magnetoresistance

Persistence of Aharonov-Bohm oscillations into the superconducting phase

Temperature dependence consistent with a helical Luttinger liquid model

Abstract

We report the coexistence of Aharonov-Bohm and Little-Parks oscillations in mesoscopic Fe(Te,Se) rings. The magnetoresistance shows two distinct periodicities: an $h/e$ component from ballistic edge interference and an $h/2e$ component from fluxoid quantization of Cooper pairs. Aharonov-Bohm oscillations persist deep into the superconducting phase, exhibit current-field symmetry, and follow a temperature dependence captured by a helical Luttinger liquid model, consistent with edge states in a topological superconductor.