We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Valley-dependent spin polarization in bulk MoS<sub>2</sub> with broken inversion symmetry.
- Authors
Suzuki, R.; Sakano, M.; Zhang, Y. J.; Akashi, R.; Morikawa, D.; Harasawa, A.; Yaji, K.; Kuroda, K.; Miyamoto, K.; Okuda, T.; Ishizaka, K.; Arita, R.; Iwasa, Y.
- Abstract
The valley degree of freedom of electrons is attracting growing interest as a carrier of information in various materials, including graphene, diamond and monolayer transition-metal dichalcogenides. The monolayer transition-metal dichalcogenides are semiconducting and are unique due to the coupling between the spin and valley degrees of freedom originating from the relativistic spin-orbit interaction. Here, we report the direct observation of valley-dependent out-of-plane spin polarization in an archetypal transition-metal dichalcogenide-MoS2-using spin- and angle-resolved photoemission spectroscopy. The result is in fair agreement with a first-principles theoretical prediction. This was made possible by choosing a 3R polytype crystal, which has a non-centrosymmetric structure, rather than the conventional centrosymmetric 2H form. We also confirm robust valley polarization in the 3R form by means of circularly polarized photoluminescence spectroscopy. Non-centrosymmetric transition-metal dichalcogenide crystals may provide a firm basis for the development of magnetic and electric manipulation of spin/valley degrees of freedom.
- Subjects
SPIN polarization; MOLYBDENUM disulfide; POLARIZED electrons; GRAPHENE; PHOTOLUMINESCENCE; SPECTRUM analysis
- Publication
Nature Nanotechnology, 2014, Vol 9, Issue 8, p611
- ISSN
1748-3387
- Publication type
Article
- DOI
10.1038/nnano.2014.148