Journal
NPJ COMPUTATIONAL MATERIALS
Volume 6, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41524-020-00470-9
Keywords
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Funding
- National Natural Science Foundation of China [11774142]
- Shenzhen Basic Research Fund [JCYJ20170817105132549, JCYJ20180504165817769, JCYJ20170817105201098]
- JSPS [19K15381]
- Center for Computational Sciences at the University of Tsukuba through the Multidisciplinary Cooperative Research Project-2020 [Xg20i067]
- Grants-in-Aid for Scientific Research [19K15381] Funding Source: KAKEN
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Using first-principles calculations, we investigate the possibility of realizing valley Hall effects (VHE) in blistered graphene sheets. We show that the Van Hove singularities (VHS) induced by structural deformations can give rise to interesting spin-valley Hall phenomena. The broken degeneracy of spin degree of freedom results in spin-filtered VH states and the valley conductivity have a Hall plateau of +/- e(2)/2h, while the blistered structures with time-reversal symmetry show the VHE with the opposite sign of sigma(K/K+)(xy) (e(2)/2h) in the two valleys. Remarkably, these results show that the distinguishable chiral valley pseudospin state can occur even in the presence of VHS induced spin splitting. The robust chiral spin-momentum textures in both massless and massive Dirac cones of the blistered systems indicate significant suppression of carrier back-scattering. Our study provides a different approach to realize spin-filtered and spin-valley contrasting Hall effects in graphene-based devices without any external field.
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