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Finite-temperature quantum discordant criticality
- Source :
- Phys. Rev. B 105, 075104 (2022)
- Publication Year :
- 2021
-
Abstract
- In quantum statistical mechanics, finite-temperature phase transitions are typically governed by classical field theories. In this context, the role of quantum correlations is unclear: recent contributions have shown how entanglement is typically very short-ranged, and thus uninformative about long-ranged critical correlations. In this work, we show the existence of finite-temperature phase transitions where a broader form of quantum correlation than entanglement, the entropic quantum discord, can display genuine signatures of critical behavior. We consider integrable bosonic field theories in both two- and three-dimensional lattices, and show how the two-mode Gaussian discord decays algebraically with the distance even in cases where the entanglement negativity vanishes beyond nearest-neighbor separations. Systematically approaching the zero-temperature limit allows us to connect discord to entanglement, drawing a generic picture of quantum correlations and critical behavior that naturally describes the transition between entangled and discordant quantum matter.<br />Comment: 8 pages, 7 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 105, 075104 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2110.10597
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.105.075104