Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer 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_ | 1866917880616976384 |
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| author | Kumar, Ravi Srivastav, Saurabh Kumar Roy, Ujjal Singhal, Ujjawal Watanabe, K. Taniguchi, T. Singh, Vibhor Roulleau, P. Das, Anindya |
| author_facet | Kumar, Ravi Srivastav, Saurabh Kumar Roy, Ujjal Singhal, Ujjawal Watanabe, K. Taniguchi, T. Singh, Vibhor Roulleau, P. Das, Anindya |
| contents | The charge neutrality point of bilayer graphene, denoted as ν = 0 state, manifests competing phases marked by spontaneously broken isospin (spin/valley/layer) symmetries under external magnetic and electric fields. However, due to their electrically insulating nature, identifying these phases through electrical conductance measurements remains challenging. A recent theoretical proposal introduces a novel approach, employing thermal transport measurements to detect these competing phases. Here, we experimentally explore the bulk thermal transport of the ν = 0 state in bilayer graphene to investigate its ground states and collective excitations associated with isospin. While the theory anticipates a finite thermal conductance in the ν = 0 state, our findings unveil an absence of detectable thermal conductance. Through variations in the external electric field and temperature-dependent measurements, our results suggest towards gapped collective excitations at ν = 0 state. Our findings underscore the necessity for further investigations into the nature of ν = 0. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_09663 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene Kumar, Ravi Srivastav, Saurabh Kumar Roy, Ujjal Singhal, Ujjawal Watanabe, K. Taniguchi, T. Singh, Vibhor Roulleau, P. Das, Anindya Mesoscale and Nanoscale Physics The charge neutrality point of bilayer graphene, denoted as ν = 0 state, manifests competing phases marked by spontaneously broken isospin (spin/valley/layer) symmetries under external magnetic and electric fields. However, due to their electrically insulating nature, identifying these phases through electrical conductance measurements remains challenging. A recent theoretical proposal introduces a novel approach, employing thermal transport measurements to detect these competing phases. Here, we experimentally explore the bulk thermal transport of the ν = 0 state in bilayer graphene to investigate its ground states and collective excitations associated with isospin. While the theory anticipates a finite thermal conductance in the ν = 0 state, our findings unveil an absence of detectable thermal conductance. Through variations in the external electric field and temperature-dependent measurements, our results suggest towards gapped collective excitations at ν = 0 state. Our findings underscore the necessity for further investigations into the nature of ν = 0. |
| title | Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.09663 |