Incommensurate Moiré Stacking and Landau Quantization Without External Magnetic Field in Turbostratic Graphene
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915505420369920 |
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| author | Garg, Mona Kumar, Ankit Rana, Deepti Arya, Anmol R, Aswini Waghmare, Umesh Kulkarni, G. U. Sheet, Goutam |
| author_facet | Garg, Mona Kumar, Ankit Rana, Deepti Arya, Anmol R, Aswini Waghmare, Umesh Kulkarni, G. U. Sheet, Goutam |
| contents | Turbostratic multilayer graphene, composed of randomly twisted and stacked graphene sheets, offers a naturally disordered yet tunable platform for exploring moiré physics beyond tedious artificial stacking. Using scanning tunneling microscopy/spectroscopy (STM/STS) and Raman analysis, we uncover a wide distribution of twist angles and stacking configurations spontaneously formed across large-area turbostratic films. In several regions, we identify overlapping incommensurate moiré patterns consistent with locally chiral trilayer stacking. We observe van Hove singularities and reconstructed Dirac-like spectra whose angle dependence supports strong interlayer electronic coherence. In the highly strained trilayered regions, we observe peaks in the local density-of states with characteristic scaling of the quantized Landau levels strikingly even in the absence of a magnetic field. They arise from the strain-induced pseudo-magnetic fields (~ 26 T), making turbostratic graphene a single natural platform to explore the physics of moiré structures as well as of the pseudo-electromagnetic fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05854 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Incommensurate Moiré Stacking and Landau Quantization Without External Magnetic Field in Turbostratic Graphene Garg, Mona Kumar, Ankit Rana, Deepti Arya, Anmol R, Aswini Waghmare, Umesh Kulkarni, G. U. Sheet, Goutam Mesoscale and Nanoscale Physics Turbostratic multilayer graphene, composed of randomly twisted and stacked graphene sheets, offers a naturally disordered yet tunable platform for exploring moiré physics beyond tedious artificial stacking. Using scanning tunneling microscopy/spectroscopy (STM/STS) and Raman analysis, we uncover a wide distribution of twist angles and stacking configurations spontaneously formed across large-area turbostratic films. In several regions, we identify overlapping incommensurate moiré patterns consistent with locally chiral trilayer stacking. We observe van Hove singularities and reconstructed Dirac-like spectra whose angle dependence supports strong interlayer electronic coherence. In the highly strained trilayered regions, we observe peaks in the local density-of states with characteristic scaling of the quantized Landau levels strikingly even in the absence of a magnetic field. They arise from the strain-induced pseudo-magnetic fields (~ 26 T), making turbostratic graphene a single natural platform to explore the physics of moiré structures as well as of the pseudo-electromagnetic fields. |
| title | Incommensurate Moiré Stacking and Landau Quantization Without External Magnetic Field in Turbostratic Graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.05854 |