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Two-dimensional valley-layer coupling heterostructures
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DOI：10.1063/5.0254488.png)
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Abstract
En 中文
Coupling valleys with different layers is a feasible way to realize valley polarization through a gate electric field, but only a few two-dimensional (2D) materials with locked valley and layer physics have been found so far. In this Letter, we show that valley-layer coupling (VLC), which is robust against spin-orbit coupling, could be achieved in 2D heterostructures built using distinct 2D monolayers with no VLC feature, as demonstrated by density functional theory calculations on Tl3Cl3/Ba2I2F2/Tl3Cl3 and Sn2Te2/K2Br2/Sn2Te2 van der Waals heterostructures. These two heterostructures exhibit valley-selective linear dichroism, which enables the optical creation of interlayer or intralayer excitons with selected valley and electric polarization. Furthermore, both the K2Br2/Sn2Te2/K2Br2 and Sn2Te2/K2ClBr/Sn2Te2 heterostructures are ferrovalley materials due to the ferroelectricity of Sn2Te2 and the built-in electric field caused by Janus K2ClBr, respectively. Our results broaden the candidate VLC materials from 2D monolayers and bilayers to 2D van der Waals heterostructures.
Keywords:
MAGNETIC CONTROL
POLARIZATION
MOS2
DICHROISM
GRAPHENE
SPIN
Journal
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3.6
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