Geometry dependence of the thermal Hall effect in chiral spin liquids
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912363308908544 |
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| author | Halász, Gábor B. |
| author_facet | Halász, Gábor B. |
| contents | Recent thermal-transport experiments on the Kitaev magnet $α$-RuCl$_3$ highlight the challenge in identifying chiral quantum spin liquids through their quantized thermal Hall effect. Here, we propose that variations in the underlying sample geometry -- for example, the introduction of appropriate constrictions -- reveal unique aspects of the thermal Hall effect and can be used to determine its origin. By studying standard phenomenological heat-transport equations based on minimal assumptions, we show that, whereas a conventional thermal Hall effect due to, e.g., phonons or magnons is completely geometry independent, a thermal Hall effect originating from a chiral fermion edge mode is significantly enhanced by constrictions at low temperatures. This unique geometry-dependent signature provides a practical approach for identifying chiral spin liquids in candidate materials like $α$-RuCl$_3$ using currently available thermal-transport experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03879 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Geometry dependence of the thermal Hall effect in chiral spin liquids Halász, Gábor B. Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science Recent thermal-transport experiments on the Kitaev magnet $α$-RuCl$_3$ highlight the challenge in identifying chiral quantum spin liquids through their quantized thermal Hall effect. Here, we propose that variations in the underlying sample geometry -- for example, the introduction of appropriate constrictions -- reveal unique aspects of the thermal Hall effect and can be used to determine its origin. By studying standard phenomenological heat-transport equations based on minimal assumptions, we show that, whereas a conventional thermal Hall effect due to, e.g., phonons or magnons is completely geometry independent, a thermal Hall effect originating from a chiral fermion edge mode is significantly enhanced by constrictions at low temperatures. This unique geometry-dependent signature provides a practical approach for identifying chiral spin liquids in candidate materials like $α$-RuCl$_3$ using currently available thermal-transport experiments. |
| title | Geometry dependence of the thermal Hall effect in chiral spin liquids |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2505.03879 |