Winding Berry dipole on uniaxially strained graphene/hBN/hBN moiré trilayers
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916557847789568 |
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| author | Huaman, Angiolo Barraza-Lopez, Salvador |
| author_facet | Huaman, Angiolo Barraza-Lopez, Salvador |
| contents | Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential $ΔV(r)$ around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene's tight-binding electronic dispersion of $π-$electrons were calculated. Relying on a semiclassical approximation, Berry dipoles $D$ are seen to change orientation and wind throughout the moiré lattice. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_10584 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Winding Berry dipole on uniaxially strained graphene/hBN/hBN moiré trilayers Huaman, Angiolo Barraza-Lopez, Salvador Mesoscale and Nanoscale Physics Nonlinear Hall-like currents can be generated by a time-periodic alternating bias on two-dimensional (2D) materials lacking inversion symmetry. To hint that the moiré between graphene and its supporting substrate contributes to the homogeneity of nonlinear currents, the change in the local potential $ΔV(r)$ around horizontally strained graphene due to a homobilayer of hexagonal boron nitride (hBN) was obtained from ab initio calculations, and corrections to on-site energies and hopping matrix elements on graphene's tight-binding electronic dispersion of $π-$electrons were calculated. Relying on a semiclassical approximation, Berry dipoles $D$ are seen to change orientation and wind throughout the moiré lattice. |
| title | Winding Berry dipole on uniaxially strained graphene/hBN/hBN moiré trilayers |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.10584 |