A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting
The ternary chalcogenide MnPSe3 monolayer recently gets a lot of attention because of its two nonequivalent energy valleys. The existence of spin–orbit coupling (SOC) effect can cause the valley splitting of around 24 meV. However, the spin degeneracy is still kept in MnPSe3 monolayer owing to the a...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-05-01
|
| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723002486 |
| _version_ | 1797844328767291392 |
|---|---|
| author | Tongwei Li Jing Chen Kai Tian Xin Jiang Xinyao Wu Haisheng Li Weiwei Ju |
| author_facet | Tongwei Li Jing Chen Kai Tian Xin Jiang Xinyao Wu Haisheng Li Weiwei Ju |
| author_sort | Tongwei Li |
| collection | DOAJ |
| description | The ternary chalcogenide MnPSe3 monolayer recently gets a lot of attention because of its two nonequivalent energy valleys. The existence of spin–orbit coupling (SOC) effect can cause the valley splitting of around 24 meV. However, the spin degeneracy is still kept in MnPSe3 monolayer owing to the antiferromagnetic coupling between Mn2+ ions. The interlayer coupling effect in the van der Waals (vdW) heterostructures can break the symmetry of MnPSe3 and induce the spin splitting. Here, we simulate the MnPSe3/GeC vdW heterostructure and investigate the effects of the stacking and interlayer coupling effect on both spin and valley splitting. The excitation mode of valley excitons is greatly related to the stacking of heterostructures. The interlayer excitons can only be formed in one of the configurations with C3 symmetry according to optical selection transition rule. The interlayer coupling effect is modulated by changing interlayer distance. With vertical compressive strain (−20%), the spin and valley splitting higher than 50 meV and 30 meV can be obtained in MnPSe3/GeC vdW heterostructures, respectively. This study suggests that the stacking and vertical strain are both efficient approaches to modulate the spin and valley splitting through the interlayer coupling effect in the vdW heterostructures. |
| first_indexed | 2024-04-09T17:20:31Z |
| format | Article |
| id | doaj.art-70131020abe24333913319b50edde3fa |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-09T17:20:31Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-70131020abe24333913319b50edde3fa2023-04-19T04:22:37ZengElsevierResults in Physics2211-37972023-05-0148106455A type-II MnPSe3/GeC heterostructure with tunable spin and valley splittingTongwei Li0Jing Chen1Kai Tian2Xin Jiang3Xinyao Wu4Haisheng Li5Weiwei Ju6Corresponding authors.; College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCollege of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCollege of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCollege of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCollege of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCollege of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaCorresponding authors.; College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, ChinaThe ternary chalcogenide MnPSe3 monolayer recently gets a lot of attention because of its two nonequivalent energy valleys. The existence of spin–orbit coupling (SOC) effect can cause the valley splitting of around 24 meV. However, the spin degeneracy is still kept in MnPSe3 monolayer owing to the antiferromagnetic coupling between Mn2+ ions. The interlayer coupling effect in the van der Waals (vdW) heterostructures can break the symmetry of MnPSe3 and induce the spin splitting. Here, we simulate the MnPSe3/GeC vdW heterostructure and investigate the effects of the stacking and interlayer coupling effect on both spin and valley splitting. The excitation mode of valley excitons is greatly related to the stacking of heterostructures. The interlayer excitons can only be formed in one of the configurations with C3 symmetry according to optical selection transition rule. The interlayer coupling effect is modulated by changing interlayer distance. With vertical compressive strain (−20%), the spin and valley splitting higher than 50 meV and 30 meV can be obtained in MnPSe3/GeC vdW heterostructures, respectively. This study suggests that the stacking and vertical strain are both efficient approaches to modulate the spin and valley splitting through the interlayer coupling effect in the vdW heterostructures.http://www.sciencedirect.com/science/article/pii/S2211379723002486MnPSe3vdW heterostructuresSpin splittingValley splittingInterlayer coupling effect |
| spellingShingle | Tongwei Li Jing Chen Kai Tian Xin Jiang Xinyao Wu Haisheng Li Weiwei Ju A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting Results in Physics MnPSe3 vdW heterostructures Spin splitting Valley splitting Interlayer coupling effect |
| title | A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting |
| title_full | A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting |
| title_fullStr | A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting |
| title_full_unstemmed | A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting |
| title_short | A type-II MnPSe3/GeC heterostructure with tunable spin and valley splitting |
| title_sort | type ii mnpse3 gec heterostructure with tunable spin and valley splitting |
| topic | MnPSe3 vdW heterostructures Spin splitting Valley splitting Interlayer coupling effect |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723002486 |
| work_keys_str_mv | AT tongweili atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT jingchen atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT kaitian atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT xinjiang atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT xinyaowu atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT haishengli atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT weiweiju atypeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT tongweili typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT jingchen typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT kaitian typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT xinjiang typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT xinyaowu typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT haishengli typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting AT weiweiju typeiimnpse3gecheterostructurewithtunablespinandvalleysplitting |