In pursuit of the tetratic phase in hard rectangles
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909609797615616 |
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| author | Dertli, Denis Speck, Thomas |
| author_facet | Dertli, Denis Speck, Thomas |
| contents | We numerically investigate two-dimensional systems of hard rectangles at constant pressure through extensive hard-particle Monte Carlo simulations. We determine the complete phase diagram as a function of packing fraction and aspect ratio, which consists of four distinct phases. At very high packing fractions, particles form a smectic solid for all aspect ratios. Rod-like particles with large aspect ratio assemble in an intervening nematic phase, which is displaced by a "tetratic" phase (also called biaxial nematic) for moderately elongated rectangles. Surprisingly, we find evidence that the transition from tetratic to smectic is weakly discontinuous at variance with previously proposed two-step scenarios for the melting of hard particles. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_06889 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | In pursuit of the tetratic phase in hard rectangles Dertli, Denis Speck, Thomas Soft Condensed Matter Statistical Mechanics We numerically investigate two-dimensional systems of hard rectangles at constant pressure through extensive hard-particle Monte Carlo simulations. We determine the complete phase diagram as a function of packing fraction and aspect ratio, which consists of four distinct phases. At very high packing fractions, particles form a smectic solid for all aspect ratios. Rod-like particles with large aspect ratio assemble in an intervening nematic phase, which is displaced by a "tetratic" phase (also called biaxial nematic) for moderately elongated rectangles. Surprisingly, we find evidence that the transition from tetratic to smectic is weakly discontinuous at variance with previously proposed two-step scenarios for the melting of hard particles. |
| title | In pursuit of the tetratic phase in hard rectangles |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2408.06889 |