Effect of proximity-induced spin-orbit coupling in graphene mesoscopic billiards

Abstract

Van der Waals heterostructures based on two-dimensional materials have recently become a very active topic of research in spintronics, both aiming at a fundamental description of spin dephasing processes in nanostructures and as a potential element in spin-based information processing schemes. Here, we theoretically investigate the magnetoconductance of mesoscopic devices built from graphene proximity-coupled to a high spin-orbit coupling material. Through numerically exact tight-binding simulations, we show that the interfacial breaking of inversion symmetry generates robust weak antilocalization even when the $z\to -z$ symmetric spin-orbit coupling in the quantum dot dominates over the Bychkov--Rashba interaction. Our findings are in interpreted on the light of random matrix theory, which links the observed behavior of quantum interference corrections to a transition from circular-orthogonal to circular-sympletic ensemble.

References in corpus (13)

• Chaotic Dirac billiard in graphene quantum dots
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Spin-orbit driven band inversion in bilayer graphene by van der Waals proximity effect
• Quantum dot behavior in graphene nanoconstrictions
• Graphene quantum dots: Beyond a Dirac billiard
• Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS${}_2$
• Symmetry Classes in Graphene Quantum Dots: Universal Spectral Statistics, Weak Localization, and Conductance Fluctuations
• Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures
• Twist-angle dependence of the proximity spin-orbit coupling in graphene on transition-metal dichalcogenides
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• Magnetotransport in heterostructures of transition metal dichalcogenides and graphene
• Weak localization and conductance fluctuations in a quantum dot with parallel magnetic field and spin-orbit scattering
• Spin Hall angle fluctuations in a disorder device

Cited by in corpus (3)

• Gate-tunable regular and chaotic electron dynamics in ballistic bilayer graphene cavities
• Lévy flight for electrons in graphene in the presence of regions with enhanced spin-orbit coupling
• Spin Hall angle in single-layer graphene