| Autor: |
Shaoqiang Guo, Huibin Zheng, Yuyan Wang, Junying Zhang |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
AIP Advances, Vol 9, Iss 7, Pp 075304-075304-6 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2158-3226 |
| DOI: |
10.1063/1.5096413 |
| Popis: |
Large spin-orbit splitting in the conduction band minimum (CBM) of monolayer transition metal dichalcogenides (TMDs) is in great demand for suppressing the intervalley scattering. Here we propose a new scheme to significantly enhance the spin-orbit splitting at the K point in the CBM of WS2 monolayer, via the n-p co-doping of fluorine and group VA elements (N, P, As and Sb). Based on the first-principles calculations, a giant spin-orbit splitting of 101.86 meV is theorized in the F-Sb co-doped system. This is evidenced to originate from the enhanced spin-orbit interaction, intimately related to the strengthened trigonal prismatic ligand field and the increased asymmetric surface charge. The giant spin-orbit splitting in the CBM can strongly suppress the intervalley scattering, which will enhance the spin-valley coupling and is beneficial for longer spin and valley lifetimes. This theoretical work provides a key to designing the high-performance monolayer TMD-based spintronic devices. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
