Observation of the Time-Reversal Symmetric Hall Effect in Graphene-WSe2 Heterostructures at Room Temperature

In this Letter, we provide experimental evidence of thetime-reversalsymmetric Hall effect in a mesoscopic system, namely, high-mobilitygraphene-WSe2 heterostructures. This linear, dissipativeHall effect, whose sign depends on the sign of the charge carriers,persists up to room temperature. The magnitude and the sign of theHall signal can be tuned using an external perpendicular electricfield. Our joint experimental and theoretical study establishes thatthe strain induced by lattice mismatch, or alignment angle inhomogeneity,produces anisotropic bands in graphene while simultaneously breakingthe inversion symmetry. The band anisotropy and reduced spatial symmetrylead to the appearance of a time-reversal symmetric Hall effect. Ourstudy establishes graphene-transition metal dichalcogenide-basedheterostructures as an excellent platform for studying the effectsof broken symmetry on the physical properties of band-engineered two-dimensionalsystems.

Automated summary

In this study, the experimental evidence of the time-reversal symmetric Hall effect in high-mobility graphene-WSe2 heterostructures is provided. This dissipative Hall effect is linear and its sign depends on the charge carriers. It persists up to room temperature and can be tuned using an external electric field. The strain induced by lattice mismatch or alignment angle inhomogeneity breaks the inversion symmetry and produces anisotropic bands in graphene, leading to the appearance of a time-reversal symmetric Hall effect.