| Autor: |
Sedrakyan, Ara, Sinner, Andreas, Ziegler, Klaus |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B Letters 103, 201104 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.103.L201104 |
| Popis: |
We construct an effective low energy Hamiltonian which describes fermions dwelling on a deformed honeycomb lattice with dislocations and disclinations, and with an arbitrary hopping parameters of the corresponding tight binding model. It describes the interaction of fermions with a 2d gravity and has also a local SU(2) gauge invariance of the group of rotations. We reformulate the model as interaction of fermions with the deformation of the lattice, which forms a phonon field. We calculate the response of fermion currents to the external deformation or phonon field, which is a result of a Z_2 anomaly. This can be detected experimentally. |
| Databáze: |
arXiv |
| Externí odkaz: |
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