Gamayun, O. V. and Ostroukh, V. P. and Gnezdilov, N. V. and Adagideli, İnanç and Beenakker, C. W. J. (2018) Valley-momentum locking in a graphene superlattice with Y-shaped Kekulé bond texture. New Journal of Physics, 20 (2). ISSN 1367-2630
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Official URL: http://dx.doi.org/10.1088/1367-2630/aaa7e5
Abstract
Recent experiments by Gutierrez et al (2016 Nat. Phys. 12 950) on a graphene-copper superlattice have revealed an unusual Kekule bond texture in the honeycomb lattice-a Y-shaped modulation of weak and strong bonds with a wave vector connecting two Dirac points. We show that this so-called 'Kek-Y' texture produces two species of massless Dirac fermions, with valley isospin locked parallel or antiparallel to the direction of motion. In a magnetic field B, the valley degeneracy of the B-dependent Landau levels is removed by the valley-momentum locking but a B-independent and valley-degenerate zero-mode remains.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | graphene; Kekule distortion; valley-momentum locking; massless Dirac fermions |
| Subjects: | Q Science > QC Physics Q Science > QC Physics > QC176-176.9 Solids. Solid state physics |
| Divisions: | Faculty of Engineering and Natural Sciences > Basic Sciences > Physics Faculty of Engineering and Natural Sciences |
| Depositing User: | İnanç Adagideli |
| Date Deposited: | 11 Aug 2018 20:46 |
| Last Modified: | 23 May 2023 15:06 |
| URI: | https://research.sabanciuniv.edu/id/eprint/35659 |
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