.png){kind=icon}
.png){kind=icon}
Return
Sliding-Controlled Switchable In-Plane Altermagnetic Ferrovalley States and Strong Optical Response in Cr2WS4 for Applications in Valleytronic Devices
.png){kind=icon}
PRE
AI
M
M
B
M
Z
DOI：10.1021/acsanm.6c02282.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Ferrovalleytronic materials, which harness both valley degrees of freedom and spin, provide a promising platform for cutting-edge spintronic devices. However, their realization remains largely limited to systems with out-of-plane magnetization and often requires an external stimulus. Here, using first-principles calculations, we not only identify Cr2WS4 as an intrinsic in-plane altermagnetic ferrovalleytronic material but also show that spin-valley locking and valley splitting are governed mainly by crystal symmetry rather than spin–orbit coupling, marking a paradigm shift in the selection of candidate systems for ferrovalleytricity. We first show that the Cr2WS4 monolayer exhibits in-plane altermagnetism characterized by large nonrelativistic spin splitting in momentum space. Next, we demonstrate that the interlayer sliding in the altermagnetic Cr2WS4 bilayer can induce ferrovalley states of up to 86 meV with the valley sign intrinsically controlled by the stacking configuration. Such a large valley splitting significantly exceeds the thermal energy at room temperature, providing a robust material platform for next-generation valleytronic devices operable without cryogenic conditions. Furthermore, the light-harvesting capability of Cr2WS4 is assessed for potential solar cell applications by calculating its optical absorption spectra, which reveal significantly enhanced absorption across the visible and ultraviolet regions compared to that of well-studied black phosphorene. These findings highlight Cr2WS4 as a promising candidate for multifunctional valleytronic, spintronic, and optoelectronic devices and motivate further experimental investigation.
Keywords:
Materials
Monolayers
Polarization
Quantum mechanics
Vesicles
altermagnetic
Cr2WS4
ferrovalley
interlayer sliding
optoelectronic
spin valley locking
Journal
IF:
5.5
Papers:
2.5K
Citations:
5.0W
Organization
Cited Papers