Giant Nonlinear Hall Effect in Twisted Bilayer WTe2
arXiv:2104.14288
Abstract
In a system with inversion symmetry broken, a second-order nonlinear Hall effect can survive even in the presence of time-reversal symmetry. In this work, we show that a giant nonlinear Hall effect can exist in twisted bilayer WTe2 system. The Berry curvature dipole of twisted bilayer WTe2 (θ = 29.4°) can reach up to ~1400 Å, which is much larger than that in previously reported nonlinear Hall systems. In twisted bilayer WTe2 system, there exists abundant band anticrossings and band inversions around the Fermi level, which brings a complicated distribution of Berry curvature, and leading to the nonlinear Hall signals exhibit dramatically oscillating behavior in this system. Its large amplitude and high tunability indicate that the twisted bilayer WTe2 can be an excellent platform for studying the nonlinear Hall effect.
arXiv comment6 pages, 6 figures
References in corpus (12)
- Berry Phase Effects on Electronic Properties
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Maximally-localized generalized Wannier functions for composite energy bands
- Maximally-localized Wannier functions for entangled energy bands
- Quantum nonlinear Hall effect induced by Berry curvature dipole in time-reversal invariant materials
- Magic continuum in twisted bilayer WSe2
- Observation of the nonlinear Hall effect under time reversal symmetric conditions
- The Berry curvature dipole in Weyl semimetal materials: an ab initio study
- Strongly enhanced Berry dipole at topological phase transitions in BiTeI
- Electrically tuneable nonlinear anomalous Hall effect in two-dimensional transition-metal dichalcogenides WTe2 and MoTe2
- Engineering Weyl phases and nonlinear Hall effects in T-MoTe
- Giant nonlinear Hall effect in strained twisted bilayer graphene