Bulk Thermal Conductance of the 5/2 and 7/3 Fractional Quantum Hall States in the Corbino Geometry
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| Format: | Preprint |
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2025
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| author | Boivin, F. Petrescu, M. Berkson-Korenberg, Z. Pfeiffer, K. W. West L. N. Gervais, G. |
| author_facet | Boivin, F. Petrescu, M. Berkson-Korenberg, Z. Pfeiffer, K. W. West L. N. Gervais, G. |
| contents | In this work, making use of time-resolved in situ Joule heating of a two-dimensional electron gas (2DEG) in the Corbino geometry, we report bulk thermal conductance measurements for the ν = 5/2 and ν = 7/3 fractional quantum Hall (FQH) states for electron temperatures ranging from 20 to 150 mK. We compare our findings with a recent study by Melcer et al. [Nature 625, 489 (2024)] that observed a finite bulk thermal conductivity \k{appa}xx in FQH states. In spite of the large size difference and the vastly different experimental schemes used to extract \k{appa}xx, we find in large part that both experiments yield similar results and conclude that the bulk of FQH states thermally conducts and violate the Wiedemann-Franz law by a wide margin. Slight discrepancies between both studies are further discussed in terms of particle-hole symmetry in the vicinity of the 5/2 and 7/3 FQH states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_09588 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bulk Thermal Conductance of the 5/2 and 7/3 Fractional Quantum Hall States in the Corbino Geometry Boivin, F. Petrescu, M. Berkson-Korenberg, Z. Pfeiffer, K. W. West L. N. Gervais, G. Mesoscale and Nanoscale Physics Strongly Correlated Electrons In this work, making use of time-resolved in situ Joule heating of a two-dimensional electron gas (2DEG) in the Corbino geometry, we report bulk thermal conductance measurements for the ν = 5/2 and ν = 7/3 fractional quantum Hall (FQH) states for electron temperatures ranging from 20 to 150 mK. We compare our findings with a recent study by Melcer et al. [Nature 625, 489 (2024)] that observed a finite bulk thermal conductivity \k{appa}xx in FQH states. In spite of the large size difference and the vastly different experimental schemes used to extract \k{appa}xx, we find in large part that both experiments yield similar results and conclude that the bulk of FQH states thermally conducts and violate the Wiedemann-Franz law by a wide margin. Slight discrepancies between both studies are further discussed in terms of particle-hole symmetry in the vicinity of the 5/2 and 7/3 FQH states. |
| title | Bulk Thermal Conductance of the 5/2 and 7/3 Fractional Quantum Hall States in the Corbino Geometry |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.09588 |