تقرير
Anomalous Electrodynamics and Quantum Geometry in the Dirac-Harper model for a Graphene Bilayer
| العنوان: | Anomalous Electrodynamics and Quantum Geometry in the Dirac-Harper model for a Graphene Bilayer |
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| المؤلفون: | Timmel, Abigail, Mele, E. J. |
| المصدر: | Phys. Rev. B 104, 075419 (2021) |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Graphene bilayers with layer antisymmetric strains are studied using the Dirac-Harper model for a pair of single layer Dirac Hamiltonians coupled by a one-dimensional moir\'e-periodic interlayer tunneling amplitude. This model hosts low energy, nearly dispersionless bands near charge neutrality that support anomalous polarizations of its charge multipole distributions. These are analyzed introducing a generalized Berry curvature that encodes the field-induced dynamics of multipole fields allowed in a chiral medium with time reversal symmetry. The formulation identifies a reciprocity relation between responses to layer-symmetric and layer-antisymmetric in-plane electric fields and reveals momentum-space quantum oscillations produced by a spatial pattern of band inversions on the moir\'e scale. Comment: 11 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.104.075419 |
| URL الوصول: | http://arxiv.org/abs/2102.11850 |
| رقم الأكسشن: | edsarx.2102.11850 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.104.075419 |
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