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Phase-Dependent Magnetic Proximity Modulations on Valley Polarization and Splitting.
- Source :
-
ACS nano [ACS Nano] 2024 Apr 23; Vol. 18 (16), pp. 10921-10929. Date of Electronic Publication: 2024 Apr 12. - Publication Year :
- 2024
-
Abstract
- Proximate-induced magnetic interactions present a promising strategy for precise manipulation of valley degrees of freedom. Taking advantage of the splendid valleytronic platform of transition metal dichalcogenides, magnetic two-dimensional VSe <subscript>2</subscript> with different phases are introduced to intervene in the spin of electrons and modulate their valleytronic properties. When constructing the heterostructures, 1T-VSe <subscript>2</subscript> /WX <subscript>2</subscript> (X = S and Se) showcases significant improvement in the valley polarizations at room temperature, while 2H-VSe <subscript>2</subscript> /WX <subscript>2</subscript> exhibits superior performance at low temperatures and demonstrates heightened sensitivity to the external magnetic field. Simultaneously, considerable valley splitting with a large g <subscript>eff</subscript> factor up to -29.0 is observed in 2H-VSe <subscript>2</subscript> /WS <subscript>2</subscript> , while it is negligible in 1T-VSe <subscript>2</subscript> /WX <subscript>2</subscript> . First-principles calculations reveal a phase-dependent magnetic proximity mechanism on the valleytronic modulations, which is dominated by interfacial charge transfer in 1T-VSe <subscript>2</subscript> /WX <subscript>2</subscript> and the proximity exchange field in 2H-VSe <subscript>2</subscript> /WX <subscript>2</subscript> heterostructures. The effective control over valley degrees of freedom will bridge the valleytronic physics and devices, rendering enormous potential in the field of valley quantum applications.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 18
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 38608131
- Full Text :
- https://doi.org/10.1021/acsnano.4c01526