Angle-resolved transport nonreciprocity and spontaneous symmetry breaking in twisted trilayer graphene
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2022
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866914689292697600 |
|---|---|
| author | Zhang, Naiyuan James Lin, Jiang-Xiazi Chichinadze, Dmitry V. Wang, Yibang Watanabe, Kenji Taniguchi, Takashi Fu, Liang Li, J. I. A. |
| author_facet | Zhang, Naiyuan James Lin, Jiang-Xiazi Chichinadze, Dmitry V. Wang, Yibang Watanabe, Kenji Taniguchi, Takashi Fu, Liang Li, J. I. A. |
| contents | The ability to identify and characterize spontaneous symmetry breaking is central to our understanding of 2D materials with strong correlation, such as the moiré flat bands in magic-angle twisted graphene bilayer and trilayer. In this work, we utilize angle-resolved measurements of transport nonreciprocity to investigate spontaneous symmetry breaking in twisted trilayer graphene. By analyzing the angular dependence of nonreciprocity in both longitudinal and transverse channels, we are able to identify the symmetry axis associated with the underlying electronic order. We report that a hysteretic rotation in the mirror axis can be induced by thermal cycles and a large current bias, which offers unambiguous evidence for the spontaneous breaking of rotational symmetry. Moreover, the onset of nonreciprocity with decreasing temperature coincides with the emergence of orbital ferromagnetism. Combined with the angular dependence of the superconducting diode effect, our findings uncover a direct link between rotational and time-reversal symmetry breaking. These symmetry requirements point towards the exchange-driven instabilities in the momentum space as a possible origin for transport nonreciprocity in tTLG. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_12964 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Angle-resolved transport nonreciprocity and spontaneous symmetry breaking in twisted trilayer graphene Zhang, Naiyuan James Lin, Jiang-Xiazi Chichinadze, Dmitry V. Wang, Yibang Watanabe, Kenji Taniguchi, Takashi Fu, Liang Li, J. I. A. Mesoscale and Nanoscale Physics Strongly Correlated Electrons The ability to identify and characterize spontaneous symmetry breaking is central to our understanding of 2D materials with strong correlation, such as the moiré flat bands in magic-angle twisted graphene bilayer and trilayer. In this work, we utilize angle-resolved measurements of transport nonreciprocity to investigate spontaneous symmetry breaking in twisted trilayer graphene. By analyzing the angular dependence of nonreciprocity in both longitudinal and transverse channels, we are able to identify the symmetry axis associated with the underlying electronic order. We report that a hysteretic rotation in the mirror axis can be induced by thermal cycles and a large current bias, which offers unambiguous evidence for the spontaneous breaking of rotational symmetry. Moreover, the onset of nonreciprocity with decreasing temperature coincides with the emergence of orbital ferromagnetism. Combined with the angular dependence of the superconducting diode effect, our findings uncover a direct link between rotational and time-reversal symmetry breaking. These symmetry requirements point towards the exchange-driven instabilities in the momentum space as a possible origin for transport nonreciprocity in tTLG. |
| title | Angle-resolved transport nonreciprocity and spontaneous symmetry breaking in twisted trilayer graphene |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2209.12964 |