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Van der Waals heterostructure Pt2 HgSe3 / CrI3 for topological valleytronics

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [3];  [4]
  1. Univ. of Science and Technology of China, Hefei (China). CAS Key Lab. of Strongly-Coupled Quantum Matter Physics, Hefei National Lab. for Physical Sciences at Microscale; OSTI
  2. Univ. of Science and Technology of China, Hefei (China). CAS Key Lab. of Strongly-Coupled Quantum Matter Physics, Hefei National Lab. for Physical Sciences at Microscale; Fuzhou Univ. (China)
  3. Univ. of Texas, Austin, TX (United States)
  4. Univ. of Science and Technology of China, Hefei (China). CAS Key Lab. of Strongly-Coupled Quantum Matter Physics, Hefei National Lab. for Physical Sciences at Microscale

We identify a valley-polarized Chern insulator in a van der Waals heterostructure, monolayer Pt2HgSe3/monolayer CrI3, for potential applications with interplay between electric, magnetic, optical, and mechanical effects. The interlayer proximity magnetic coupling nearly closes the band gap of monolayer Pt2HgSe3, and the strong intralayer spin-orbit coupling further lifts the valley degeneracy by over 100 meV, leading to positive and negative band gaps at opposite valleys. In the valley with negative gap, the interfacial Rashba spin-orbit coupling opens a topological band gap of 17.8 meV, which is enlarged to 30.8 meV by adding a hexagonal boron nitride (h-BN) layer. We find large orbital magnetization in the Pt2HgSe3 layer that is much larger than spin, which can induce a measurable optical Kerr effect. Additionally, the valley polarization and Chern number are coupled to the magnetic order of the nearest-neighbor CrI3 layer, which is switchable by electric, magnetic, and mechanical means in experiments. The presence of h-BN protects the topological phase, allowing the construction of superlattices with valley, spin, and layer degrees of freedom.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key R&D Program of China; National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation
Grant/Contract Number:
FG03-02ER45958
OSTI ID:
1850223
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 104; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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