Full and fractional defects across the Berezinskii-Kosterlitz-Thouless transition in a driven-dissipative spinor quantum fluid
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913182724915200 |
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| author | Dagvadorj, G. Comaron, P. Szymanska, M. H. |
| author_facet | Dagvadorj, G. Comaron, P. Szymanska, M. H. |
| contents | We investigate the properties of a two-dimensional \emph{spinor} microcavity polariton system driven by a linearly polarised continuous pump. In particular, we establish the role of the elementary excitations, namely the so-called half-vortices and full-vortices; these objects carry a quantum rotation only in one of the two, or both, spin components respectively. Our numerical analysis of the steady-state shows that it is only the half-vortices that are present in the vortex-antivortex pairing/dissociation responsible for the Berezinskii-Kosterlitz-Thouless transition. These are the relevant elementary excitations close to the critical point. However, by exploring the phase-ordering dynamics following a sudden quench across the transition we prove that full-vortices become the relevant excitations away from the critical point in a deep quasi-ordered state at late times. The time-scales for half-vortices binding into full vortices are much faster than the vortex-antivortex annihilations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_03400 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Full and fractional defects across the Berezinskii-Kosterlitz-Thouless transition in a driven-dissipative spinor quantum fluid Dagvadorj, G. Comaron, P. Szymanska, M. H. Quantum Gases Mesoscale and Nanoscale Physics Fluid Dynamics Optics We investigate the properties of a two-dimensional \emph{spinor} microcavity polariton system driven by a linearly polarised continuous pump. In particular, we establish the role of the elementary excitations, namely the so-called half-vortices and full-vortices; these objects carry a quantum rotation only in one of the two, or both, spin components respectively. Our numerical analysis of the steady-state shows that it is only the half-vortices that are present in the vortex-antivortex pairing/dissociation responsible for the Berezinskii-Kosterlitz-Thouless transition. These are the relevant elementary excitations close to the critical point. However, by exploring the phase-ordering dynamics following a sudden quench across the transition we prove that full-vortices become the relevant excitations away from the critical point in a deep quasi-ordered state at late times. The time-scales for half-vortices binding into full vortices are much faster than the vortex-antivortex annihilations. |
| title | Full and fractional defects across the Berezinskii-Kosterlitz-Thouless transition in a driven-dissipative spinor quantum fluid |
| topic | Quantum Gases Mesoscale and Nanoscale Physics Fluid Dynamics Optics |
| url | https://arxiv.org/abs/2312.03400 |