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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.13497 |
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| _version_ | 1866911063330521088 |
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| author | Bahamondes, Sebastián Landea, Ignacio Salazar Soto-Garrido, Rodrigo |
| author_facet | Bahamondes, Sebastián Landea, Ignacio Salazar Soto-Garrido, Rodrigo |
| contents | We present a version of a strongly correlated 2+1-dimensional condensed matter system that features a thermal phase transition between a semimetal and an insulator through a semi-Dirac quantum critical region using AdS/CFT holography. We introduce backreaction into the bulk equations of motion to measure transport coefficients in the boundary; specifically the shear viscosity $η$. By explicitly breaking rotational symmetry we find a new instance of violation of the KSS-bound for the $η/s$ ratio in the quantum critical region, as well as a monotone dependence on temperature in the $T\to 0$ regime fixed by a Lifshitz dynamical critical exponent. We find that the Lifshitz critical exponent in the anisotropic direction is approximately equal to $2$ for our choice of backreaction parameters. We find explicit $T=0$ solutions separated by a quantum critical point in parameter space, showing that the thermal critical phase found in previous work comes from a quantum phase transition at zero temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_13497 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Out-of-bounds hydrodynamics in holographic anisotropic Dirac semimetals Bahamondes, Sebastián Landea, Ignacio Salazar Soto-Garrido, Rodrigo High Energy Physics - Theory Other Condensed Matter We present a version of a strongly correlated 2+1-dimensional condensed matter system that features a thermal phase transition between a semimetal and an insulator through a semi-Dirac quantum critical region using AdS/CFT holography. We introduce backreaction into the bulk equations of motion to measure transport coefficients in the boundary; specifically the shear viscosity $η$. By explicitly breaking rotational symmetry we find a new instance of violation of the KSS-bound for the $η/s$ ratio in the quantum critical region, as well as a monotone dependence on temperature in the $T\to 0$ regime fixed by a Lifshitz dynamical critical exponent. We find that the Lifshitz critical exponent in the anisotropic direction is approximately equal to $2$ for our choice of backreaction parameters. We find explicit $T=0$ solutions separated by a quantum critical point in parameter space, showing that the thermal critical phase found in previous work comes from a quantum phase transition at zero temperature. |
| title | Out-of-bounds hydrodynamics in holographic anisotropic Dirac semimetals |
| topic | High Energy Physics - Theory Other Condensed Matter |
| url | https://arxiv.org/abs/2507.13497 |