Tunable valley polarization in Janus WSSe by magnetic proximity coupling to a CrI3 layer

She, X. C.1,2; Zhang, R. L.1,2; Zhao, Jin-Zhu3,4,5; Qi, D. X.1,2; Zou, Y.1,2; Peng, Ru-Wen1,2

2021-07-01

10.1039/d1cp02577e

PHYSICAL CHEMISTRY CHEMICAL PHYSICS   影响因子和分区

1463-9076

1463-9084

We investigate the electronic properties and valley physics of Janus monolayer WSSe on a CrI3 substrate layer based on first-principles calculations. It is shown that the K and K ' valley degeneracy can be lifted which leads to valley polarization (VP) in the WSSe due to the magnetic proximity coupling to a magnetic substrate. The magnitude of VP is highly sensitive to the interfacial electronic properties and can be tuned by varying the stacking configurations of the heterostructure. Interestingly, the direction of VP can be altered by manipulating the layer alignment without reversing the magnetism orientation of the magnetic substrate CrI3. We suggest that the hybridization between the bands of WSSe and the substrate plays an important role. Meanwhile, the charge distributions have been mapped out to uncover the microscopic origin of the direction variable VP. In addition, large VP can be achieved by adjusting the interlayer spacing. Our investigations may have potential applications in the design of valleytronic devices.

SCI ; EI

英语

其他

National Natural Science Foundation of China[10904061]

Chemistry ; Physics

Chemistry, Physical ; Physics, Atomic, Molecular & Chemical

WOS:000686595500001

ROYAL SOC CHEMISTRY

20213610850224

Calculations ; Chromium compounds ; Electronic properties ; Landforms ; Magnetism ; Polarization ; Substrates

Geology:481.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Mathematics:921

CHEMISTRY

Web of Science

1.Nanjing Univ, Natl Lab Solid State Microstruct, Sch Phys, Nanjing 210093, Peoples R China
2.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
3.South China Normal Univ, Sch Phys & Telecommun Engn, Guangdong Prov Key Lab Quantum Mat, Guangzhou 510006, Peoples R China
4.South China Normal Univ, Guangdong Hong Kong Joint Lab Quantum Matter Sout, Guangzhou 510006, Peoples R China
5.Southern Univ Sci & Technol, Ctr Computat Sci & Engn, Shenzhen 518055, Peoples R China

She, X. C.,Zhang, R. L.,Zhao, Jin-Zhu,et al. Tunable valley polarization in Janus WSSe by magnetic proximity coupling to a CrI3 layer[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2021,23:18182-18188.

She, X. C.,Zhang, R. L.,Zhao, Jin-Zhu,Qi, D. X.,Zou, Y.,&Peng, Ru-Wen.(2021).Tunable valley polarization in Janus WSSe by magnetic proximity coupling to a CrI3 layer.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,23,18182-18188.

She, X. C.,et al."Tunable valley polarization in Janus WSSe by magnetic proximity coupling to a CrI3 layer".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 23(2021):18182-18188.