Ultrafast switching of sliding ferroelectricity and dynamical magnetic field in van der Waals bilayer induced by light
arxiv(2024)
摘要
Sliding ferroelectricity is a unique type of polarity recently observed in a
properly stacked van der Waals bilayer. However, electric-field control of
sliding ferroelectricity is hard and could induce large coercive electric
fields and serious leakage currents which corrode the ferroelectricity and
electronic properties, which are essential for modern two-dimensional
electronics and optoelectronics. Here, we proposed laser-pulse deterministic
control of sliding ferroelectricity in bilayer h-BN by first principles and
molecular dynamics simulation with machine-learned force fields. The laser
pulses excite shear modes which exhibit certain directional movements of
lateral sliding between bilayers. The vibration of excited modes under laser
pulses is predicted to overcome the energy barrier and achieve the switching of
sliding ferroelectricity. Furthermore, it is found that three possible sliding
transitions - between AB (BA) and BA (AB) stacking - can lead to the occurrence
of dynamical magnetic fields along three different directions. Remarkably, the
magnetic fields are generated by the simple linear motion of nonmagnetic
species, without any need for more exotic (circular, spiral) pathways. Such
predictions of deterministic control of sliding ferroelectricity and
multi-states of dynamical magnetic field thus expand the potential applications
of sliding ferroelectricity in memory and electronic devices.
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