Vanishing bulk heat flow in the nu=0 quantum Hall ferromagnet in monolayer graphene
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866915060058685440 |
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| author | Delagrange, Raphaëlle Garg, Manjari Breton, Gaëlle Le Zhang, Aifei Dong, Quan Jin, Yong Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Maillet, Olivier Roche, Patrice Parmentier, François D. |
| author_facet | Delagrange, Raphaëlle Garg, Manjari Breton, Gaëlle Le Zhang, Aifei Dong, Quan Jin, Yong Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Maillet, Olivier Roche, Patrice Parmentier, François D. |
| contents | Under high perpendicular magnetic field and at low temperatures, graphene develops an insulating state at the charge neutrality point. This state, dubbed $ν=0$, is due to the interplay between electronic interactions and the four-fold spin and valley degeneracies in the flat band formed by the $n=0$ Landau level. Determining the ground state of $ν=0$, including its spin and valley polarization, has been a theoretical and experimental undertaking for almost two decades. Here, we present experiments probing the bulk thermal transport properties of monolayer graphene at $ν=0$, which directly probe its ground state and collective excitations. We observe a vanishing bulk thermal transport, in contradiction with the expected ground state, predicted to have a finite thermal conductance even at very low temperature. Our result highlight the need for further investigations on the nature of $ν=0$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_08878 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Vanishing bulk heat flow in the nu=0 quantum Hall ferromagnet in monolayer graphene Delagrange, Raphaëlle Garg, Manjari Breton, Gaëlle Le Zhang, Aifei Dong, Quan Jin, Yong Watanabe, Kenji Taniguchi, Takashi Roulleau, Preden Maillet, Olivier Roche, Patrice Parmentier, François D. Mesoscale and Nanoscale Physics Under high perpendicular magnetic field and at low temperatures, graphene develops an insulating state at the charge neutrality point. This state, dubbed $ν=0$, is due to the interplay between electronic interactions and the four-fold spin and valley degeneracies in the flat band formed by the $n=0$ Landau level. Determining the ground state of $ν=0$, including its spin and valley polarization, has been a theoretical and experimental undertaking for almost two decades. Here, we present experiments probing the bulk thermal transport properties of monolayer graphene at $ν=0$, which directly probe its ground state and collective excitations. We observe a vanishing bulk thermal transport, in contradiction with the expected ground state, predicted to have a finite thermal conductance even at very low temperature. Our result highlight the need for further investigations on the nature of $ν=0$. |
| title | Vanishing bulk heat flow in the nu=0 quantum Hall ferromagnet in monolayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.08878 |