Anomalous Hall Effect in Thin Bismuth

Abstract

Bismuth, the heaviest of all group V elements with strong spin-orbit coupling, is famously known to exhibit many interesting transport properties, and effects such as Shubnikov-de Haas and de Haas-van Alphen were first revealed in its bulk form. However, the transport properties have not yet been fully explored experimentally in thin bismuth nor in its 2D limit. In this work, bismuth flakes with average thicknesses ranging from 29 to 69 nm were mechanically exfoliated by a micro-trench technique and were used to fabricate four-point devices. Due to mixing of components, Onsager's relations were used to extract the longitudinal ($R_{xx}$) and Hall ($R_{xy}$) resistances where the latter shows a Hall anomaly that is consistent with the Anomalous Hall Effect (AHE). Our work strongly suggests that that there could be a hidden mechanism for time-reversal symmetry breaking in pure bismuth thin films.

References in corpus (16)

• Anomalous Hall effect
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Intrinsic quantized anomalous Hall effect in a moiré heterostructure
• Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
• Higher-Order Topology in Bismuth
• Unconventional superconductivity in nearly flat bands in twisted bilayer graphene
• Experimental evidence for bulk superconductivity in pure Bismuth single crystal at ambient pressure
• Bi(111) thin film with insulating interior but metallic surfaces
• Nanoscale Strain Engineering of Giant Pseudo-Magnetic Fields, Valley Polarization and Topological Channels in Graphene
• Evidence for Higher order topology in Bi and Bi${}_{0.92}$Sb${}_{0.08}$
• Emptying Dirac valleys in bismuth using high magnetic fields
• Magnetoresistance and valley degree of freedom in bulk bismuth
• Topologically Nontrivial Bismuth(111) Thin Films Grown on Bi2Te3
• Reinventing Solid State Electronics: Harnessing Quantum Confinement in Bismuth Thin Films
• Anomalous Hall Effect in Bismuth
• Method of Mechanical Exfoliation of Bismuth with Micro-Trench Structures

Cited by in corpus (1)

• Observation of Temperature Independent Anomalous Hall Effect in Thin Bismuth from Near Absolute Zero to 300 K Temperature