Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 13, Pages 12675-12682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02095
Keywords
AgBiP2Se6; CrI3; triferroic material; valleytronics; electrical control
Funding
- National Natural Science Foundation of China [51871161, 51671142, U1632152]
- Key Project of Natural Science Foundation of Tianjin City [16JCZDJC37300]
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The generation and manipulation of valley polarization in controllable ways are important for the valley-related physics and devices. In analogy to multiferroic materials with more than one ferromagnetic, ferroelectric, and ferroelastic orders, a new triferroic system with ferromagnetism, ferroelectricity, and ferrovalley is proposed, namely, the monolayer AgBiP,Se6/CrI3 van der Waals heterostructure. Using density functional theory, we further predict that the electrical control on the valley degree of freedom could be realized in this triferroic system. The mechanism of electrically controlled valley is elucidated as an intermediate coupling between lattice and ferroelectricity. The coupling of three ferroic orders in triferroic material paves the way for electrically controlled valleytronic devices.
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