Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
| Autor: | Carmem M. Gilardoni, Freddie Hendriks, Marcos H. D. Guimarães, Caspar H. van der Wal |
|---|---|
| Přispěvatelé: | Physics of Nanodevices, Zernike Institute for Advanced Materials |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Spintronics Spin polarization Scattering Point reflection FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Symmetry (physics) Transition metal 0103 physical sciences Monolayer cond-mat.mes-hall Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics 0210 nano-technology Spin-½ |
| Zdroj: | Physical Review. B: Condensed Matter and Materials Physics, 103(11):115410. AMER PHYSICAL SOC |
| ISSN: | 0163-1829 |
| DOI: | 10.48550/arxiv.2101.01565 |
| Popis: | Transition metal dichalcogenides (TMDs) combine interesting optical and spintronic properties in an atomically-thin material, where the light polarization can be used to control the spin and valley degrees-of-freedom for the development of novel opto-spintronic devices. These promising properties emerge due to their large spin-orbit coupling in combination with their crystal symmetries. Here, we provide simple symmetry arguments in a group-theory approach to unveil the symmetry-allowed spin scattering mechanisms, and indicate how one can use these concepts towards an external control of the spin lifetime. We perform this analysis for both monolayer (inversion asymmetric) and bilayer (inversion symmetric) crystals, indicating the different mechanisms that play a role in these systems. We show that, in monolayer TMDs, electrons and holes transform fundamentally differently -- leading to distinct spin-scattering processes. We find that one of the electronic states in the conduction band is partially protected by time-reversal symmetry, indicating a longer spin lifetime for that state. In bilayer and bulk TMDs, a hidden spin-polarization can exist within each layer despite the presence of global inversion symmetry. We show that this feature enables control of the interlayer spin-flipping scattering processes via an out-of-plane electric field, providing a mechanism for electrical control of the spin lifetime. Comment: 9 pages, 3 figures |
| Databáze: | OpenAIRE |
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