Commensurate-Incommensurate Transition in Submonolayer $^3$He on Graphite
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arXiv
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| Format: | Preprint |
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2026
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| author | Kumashita, A. Usami, J. Komatsu, S. Yamane, Y. Miyasaka, S. Fukuyama, H. Yamaguchi, A. |
| author_facet | Kumashita, A. Usami, J. Komatsu, S. Yamane, Y. Miyasaka, S. Fukuyama, H. Yamaguchi, A. |
| contents | We report high-precision heat-capacity measurements of submonolayer $^3$He adsorbed on highly crystalline graphite, revealing new aspects of the commensurate$-$incommensurate transition. Below 1K, two possible striped domain-wall phases emerge: $α_1$ with variable wall spacing and $α_2$ with fixed spacing. The $T$-linear heat capacity in $α_1$ arises from one-dimensional phonons along the walls. $α_2$ melts into $α_1$ at a critical density via a second-order transition, consistent with a quantum nematic (quantum liquid-crystal) state in $α_1$, and reconciling thermodynamic and prior nuclear-magnetic data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_10974 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Commensurate-Incommensurate Transition in Submonolayer $^3$He on Graphite Kumashita, A. Usami, J. Komatsu, S. Yamane, Y. Miyasaka, S. Fukuyama, H. Yamaguchi, A. Other Condensed Matter Materials Science We report high-precision heat-capacity measurements of submonolayer $^3$He adsorbed on highly crystalline graphite, revealing new aspects of the commensurate$-$incommensurate transition. Below 1K, two possible striped domain-wall phases emerge: $α_1$ with variable wall spacing and $α_2$ with fixed spacing. The $T$-linear heat capacity in $α_1$ arises from one-dimensional phonons along the walls. $α_2$ melts into $α_1$ at a critical density via a second-order transition, consistent with a quantum nematic (quantum liquid-crystal) state in $α_1$, and reconciling thermodynamic and prior nuclear-magnetic data. |
| title | Commensurate-Incommensurate Transition in Submonolayer $^3$He on Graphite |
| topic | Other Condensed Matter Materials Science |
| url | https://arxiv.org/abs/2603.10974 |