| Autor: |
O V Gamayun, V P Ostroukh, N V Gnezdilov, İ Adagideli, C W J Beenakker |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 20, Iss 2, p 023016 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/aaa7e5 |
| Popis: |
Recent experiments by Gutiérrez et al (2016 Nat. Phys. 12 950) on a graphene–copper superlattice have revealed an unusual Kekulé 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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