Cooperative orbital moments and edge magnetoresistance in monolayer WTe${}_2$

Abstract

We argue that edge electrons in monolayer WTe${}_2$ can possess a "cooperative" orbital moment (COM) that critically impacts its edge magnetoresistance behavior. Arising from the cooperative action of both Rashba and Ising spin orbit coupling, COM quickly achieves large magnitudes (of order few Bohr magnetons) even for relatively small spin-orbit coupling strengths. As we explain, such large COM magnitudes arise from an unconventional cooperative spin canting of edge spins when Rashba and Ising spin orbit coupling act together. Strikingly, COM can compete with spin moments to produce an unusual anisotropic edge magnetoresistance oriented at an oblique angle. In particular, this competition produces a direction along which $\mathbf{B}$ is ineffective at gapping out the edge spectrum leaving it nearly gapless. As a result, large contrasts in gap sizes manifest as $\mathbf{B}$ is rotated granting giant anisotropic magnetoresistance of 0.1-10 million % at 10 T and low temperature.

References in corpus (28)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Titanic Magnetoresistance in WTe2
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• The Quantum Spin Hall Effect: Theory and Experiment
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• The Helical Liquid and the Edge of Quantum Spin Hall Systems
• Edge conduction in monolayer WTe2
• Finite size effects of helical edge states in HgTe/CdTe quantum wells
• Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
• Imaging Quantum Spin Hall Edges in Monolayer WTe2
• Fingerprint of Different Spin-Orbit Terms for Spin Transport in HgTe Quantum Wells
• Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges
• Magnetoconductance of the quantum spin Hall state
• Topological phases in a two-dimensional lattice: Magnetic field versus spin-orbit coupling
• Symmetry, spin-texture, and tunable quantum geometry in a WTe${}_2$ monolayer
• Magnetic field effects on edge and bulk states in topological insulators based on HgTe/CdHgTe quantum wells with strong natural interface inversion asymmetry
• Testing Topological Protection of Edge States in Hexagonal Quantum Spin Hall Candidate Materials
• The influence of lattice termination on the edge states of the quantum spin Hall insulator monolayer $1T^{\prime }$-WTe${}_2$
• Custodial glide symmetry of quantum spin Hall edge modes in WTe${}_2$ monolayer
• Current-induced gap opening in interacting topological insulator surfaces

Cited by in corpus (7)

• Determination of the spin axis in quantum spin Hall insulator monolayer WTe2
• Determination of the spin orientation of helical electrons in monolayer WTe2
• Non-linear ballistic response of quantum spin-Hall edge states
• Quantum spin Hall edge states and interlayer coupling in twisted-bilayer WTe${}_2$
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Edge spin transport in the disordered two-dimensional topological insulator WTe${}_2$
• Inverse Ising effect and Ising magnetoresistance