Cavity quantum electrodynamics of strongly correlated electron systems: A no-go theorem for photon condensation
| Autor: | Gian Marcello Andolina, Vittorio Giovannetti, Allan H. MacDonald, Marco Polini, Francesco M. D. Pellegrino |
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| Přispěvatelé: | Andolina, G. M., Pellegrino, F. M. D., Giovannetti, V., Macdonald, A. H., Polini, M. |
| Rok vydání: | 2019 |
| Předmět: |
Photon
Field (physics) Physics - Mesoscopic Systems and Quantum Hall Effect Physics::Optics 02 engineering and technology Quantum phases Physics - Strongly Correlated Electron 01 natural sciences Settore FIS/03 - Fisica della Materia cavity quantum electrodynamics Quantum mechanics 0103 physical sciences Gauge theory photon condensation 010306 general physics Quantum Condensed Matter::Quantum Gases Physics Quantum Physics Condensed Matter::Other Cavity quantum electrodynamics 021001 nanoscience & nanotechnology No-go theorem Strongly correlated material insulating ferroelectric 0210 nano-technology |
| Zdroj: | Physical Review B 100 (2019): 121109-1–121109-6. doi:10.1103/PhysRevB.100.121109 info:cnr-pdr/source/autori:Andolina G.M.; Pellegrino F.M.D.; Giovannetti V.; Macdonald A.H.; Polini M./titolo:Cavity quantum electrodynamics of strongly correlated electron systems: A no-go theorem for photon condensation/doi:10.1103%2FPhysRevB.100.121109/rivista:Physical Review B/anno:2019/pagina_da:121109-1/pagina_a:121109-6/intervallo_pagine:121109-1–121109-6/volume:100 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.121109 |
| Popis: | In spite of decades of work it has remained unclear whether or not superradiant quantum phases, referred to here as photon condensates, can occur in equilibrium. In this Rapid Communication, we first show that when a nonrelativistic quantum many-body system is coupled to a cavity field, gauge invariance forbids photon condensation. We then present a microscopic theory of the cavity quantum electrodynamics of an extended Falicov-Kimball model, showing that, in agreement with the general theorem, its insulating ferroelectric and exciton condensate phases are not altered by the cavity and do not support photon condensation. In spite of decades of work it has remained unclear whether or not superradiant quantum phases, referred to here as photon condensates, can occur in equilibrium. In this Rapid Communication, we first show that when a nonrelativistic quantum many-body system is coupled to a cavity field, gauge invariance forbids photon condensation. We then present a microscopic theory of the cavity quantum electrodynamics of an extended Falicov-Kimball model, showing that, in agreement with the general theorem, its insulating ferroelectric and exciton condensate phases are not altered by the cavity and do not support photon condensation. |
| Databáze: | OpenAIRE |
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