Dielectric response in twisted MoS2 bilayer facilitated by spin-orbit coupling effect
arxiv(2024)
摘要
Twisted van der Waals bilayers provide ideal two-dimensional (2D) platforms
to study the interplay between spin and charge degree of freedom of electron.
An exotic dielectric response behavior in such system is what we find here
through the investigation of twisted bilayer MoS2 with two different stackings
but same size of the commensurate supercell, which forms H-type like and R-type
like stacked bilayer system. Our first-principles calculations show that
applying an out-of-plane electric field gives rise to different response of the
electric polarization, whose susceptibility is suppressed in H-type like case
compared with that of R-type like one. Further analysis shows the dielectric
response to perpendicular electric field is linked to the moire ferroelectric
dipole texture. Their underlying link comes from that, through Rashba
spin-orbit coupling (SOC) effect, the external electric field tends to change
the internal pseudo-spin texture, which further depends on the twist induced
dipole texture. Consequently, the suppression of dielectric response can be
attributed to the topology protection of such ferroelectric dipole structure.
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