Abstract

Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential ∆V(r) around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene’s tight-binding electronic dispersion of π-electrons were calculated. Relying on a semiclassical approximation, Berry dipoles D are seen to change orientation and wind throughout the moiré.

Abstract

Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential ∆V(r) around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene’s tight-binding electronic dispersion of π-electrons were calculated. Relying on a semiclassical approximation, Berry dipoles D are seen to change orientation and wind throughout the moiré.

Abstract

Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential ∆V(r) around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene’s tight-binding electronic dispersion of π-electrons were calculated. Relying on a semiclassical approximation, Berry dipoles D are seen to change orientation and wind throughout the moiré.

Abstract

Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential ∆V(r) around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene’s tight-binding electronic dispersion of π-electrons were calculated. Relying on a semiclassical approximation, Berry dipoles D are seen to change orientation and wind throughout the moiré.