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A finite Berry curvature dipole can induce a nonlinear Hall effect in which a charge current induces a second harmonic transverse electric voltage under time-reversal-symmetric condition. Here, we report the transport measurement of giant nonlinear Hall effect in twisted WSe$_2$ homobilayers as evidenced by the dominated second harmonic Hall voltage that scales quadratically with the injection current. Benefited from strain-induced symmetry breaking, the nonlinear Hall effects are measurable globally along all in-plane directions. At the half-filling of the hole moire superlattice band in twisted WSe$_2$ where interaction effects are strong, we observe a record high nonlinear Hall responsivity of 10$^{10}$ V W$^{-1}$. Our work demonstrates a new and highly tunable correlated system to achieve nonlinear Hall effect and provides potential device applications using artificially constructed van der Waals superlattices.
Recently, it has been pointed out that the twisting of bilayer WSe$_2$ would generate topologically non-trivial flat bands near the Fermi energy. In this work, we show that twisted bilayer WSe$_2$ (tWSe$_2$) with uniaxial strain exhibits a large nonl
Recent studies have shown that moir{e} flat bands in a twisted bilayer graphene(TBG) can acquire nontrivial Berry curvatures when aligned with hexagonal boron nitride substrate [1, 2], which can be manifested as a correlated Chern insulator near the
While the anomalous Hall effect can manifest even without an external magnetic field, time reversal symmetry is nonetheless still broken by the internal magnetization of the sample. Recently, it has been shown that certain materials without an invers
Lattice reconstruction in twisted transition-metal dichalcogenide (TMD) bilayers gives rise to piezo- and ferroelectric moire potentials for electrons and holes, as well as a modulation of the hybridisation across the bilayer. Here, we develop hybrid
Twisted bilayer graphene provides a new two-dimensional platform for studying electron interaction phenomena and flat band properties such as correlated insulator transition, superconductivity and ferromagnetism at certain magic angles. Here, we pres