Self-diffusion and structure of a quasi two-dimensional, classical Coulomb gas under increasing magnetic field and temperature
The influence of a magnetic field applied perpendicularly to the plane of a quasi two-dimensional, low-density classical Coulomb gas, with interparticle potential U(r)∼1/r, is studied using momentum-conserving dissipative particle dynamics simulations. The self-diffusion and structure of the gas are...
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Published in | Physical review research Vol. 5; no. 4; p. 043223 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
American Physical Society
01.12.2023
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Online Access | Get full text |
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Summary: | The influence of a magnetic field applied perpendicularly to the plane of a quasi two-dimensional, low-density classical Coulomb gas, with interparticle potential U(r)∼1/r, is studied using momentum-conserving dissipative particle dynamics simulations. The self-diffusion and structure of the gas are studied as functions of temperature and strength of the magnetic field. It is found that the gas undergoes a topological phase transition when the temperature is varied with, in accord with the Bohr–van Leeuwen (BvL) theorem, the structural properties being unaffected, resembling those of the strictly two-dimensional Kosterlitz-Thouless transition, with U(r)∼ln(r). Consistent with the BvL theorem, the transition temperature and the melting process of the condensed phase are unchanged by the field. Conversely, the self-diffusion coefficient of the gas is strongly reduced by the magnetic field. At the largest values of the cyclotron frequency, the self-diffusion coefficient is inversely proportional to the applied magnetic field. The implications of these results are discussed. |
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ISSN: | 2643-1564 2643-1564 |
DOI: | 10.1103/PhysRevResearch.5.043223 |