Superballistic paradox in electron fluids: Evidence of tomographic transport
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915939736354816 |
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| author | Estrada-Álvarez, Jorge Díaz, Elena Domínguez-Adame, Francisco |
| author_facet | Estrada-Álvarez, Jorge Díaz, Elena Domínguez-Adame, Francisco |
| contents | Electron hydrodynamics encompasses the exotic fluid-like behavior of electrons in two-dimensional materials such as graphene. It accounts for superballistic conduction, also known as the Gurzhi effect, where increasing temperature reduces the electrical resistance. In analogy with conventional fluids, the Gurzhi effect is only expected in the hydrodynamic regime, with the decrease in the resistance occurring at intermediate temperatures. Nonetheless, experiments on electron fluids consistently show that superballistic conduction starts at close-to-zero temperatures. To address this paradox, we study hydrodynamic flow, and we find that replacing the classical dynamics with tomographic dynamics, where only head-on collisions are allowed between electrons, solves the dilemma. The latter strengthens superballistic conduction, with potential applications in low-dissipation devices, and explains its differences with the Molenkamp effect and conventional fluids dynamics. Our study reveals that the superballistic paradox is resolved by considering the electrons not as classical particles but as fermions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_10265 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superballistic paradox in electron fluids: Evidence of tomographic transport Estrada-Álvarez, Jorge Díaz, Elena Domínguez-Adame, Francisco Mesoscale and Nanoscale Physics Quantum Gases Statistical Mechanics Electron hydrodynamics encompasses the exotic fluid-like behavior of electrons in two-dimensional materials such as graphene. It accounts for superballistic conduction, also known as the Gurzhi effect, where increasing temperature reduces the electrical resistance. In analogy with conventional fluids, the Gurzhi effect is only expected in the hydrodynamic regime, with the decrease in the resistance occurring at intermediate temperatures. Nonetheless, experiments on electron fluids consistently show that superballistic conduction starts at close-to-zero temperatures. To address this paradox, we study hydrodynamic flow, and we find that replacing the classical dynamics with tomographic dynamics, where only head-on collisions are allowed between electrons, solves the dilemma. The latter strengthens superballistic conduction, with potential applications in low-dissipation devices, and explains its differences with the Molenkamp effect and conventional fluids dynamics. Our study reveals that the superballistic paradox is resolved by considering the electrons not as classical particles but as fermions. |
| title | Superballistic paradox in electron fluids: Evidence of tomographic transport |
| topic | Mesoscale and Nanoscale Physics Quantum Gases Statistical Mechanics |
| url | https://arxiv.org/abs/2502.10265 |