Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled XY Models
| Autor: | Luca Salasnich, István Nándori, Andrea Trombettoni, G. Bighin, Nicolò Defenu |
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| Přispěvatelé: | Bighin, G., Defenu, N., Nandori, I., Salasnich, L., Trombettoni, A. |
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics 2D systems Phase (waves) General Physics and Astronomy Renormalization group 01 natural sciences Coupling (physics) Exponential growth critical-behavior transition temperature vortices dynamics physics Condensed Matter::Superconductivity Quantum mechanics 0103 physical sciences Limit (mathematics) Exponential decay 010306 general physics Quantum tunnelling Phase diagram |
| Zdroj: | Physical review letters 123 (2019): 100601–100601. doi:10.1103/PhysRevLett.123.100601 info:cnr-pdr/source/autori:Bighin, Giacomo; Defenu, Nicolo; Nandori, Istvan; Salasnich, Luca; Trombettoni, Andrea/titolo:Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled XY Models/doi:10.1103%2FPhysRevLett.123.100601/rivista:Physical review letters (Print)/anno:2019/pagina_da:100601/pagina_a:100601/intervallo_pagine:100601–100601/volume:123 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.123.100601 |
| Popis: | We study the effect of a linear tunneling coupling between two-dimensional systems, each separately exhibiting the topological Berezinskii-Kosterlitz-Thouless (BKT) transition. In the uncoupled limit, there are two phases: one where the one-body correlation functions are algebraically decaying and the other with exponential decay. When the linear coupling is turned on, a third BKT-paired phase emerges, in which one-body correlations are exponentially decaying, while two-body correlation functions exhibit power-law decay. We perform numerical simulations in the paradigmatic case of two coupled XY models at finite temperature, finding evidences that for any finite value of the interlayer coupling, the BKT-paired phase is present. We provide a picture of the phase diagram using a renormalization group approach. |
| Databáze: | OpenAIRE |
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