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Comparison of various types of coherence and emergent coherent systems
Author(s) -
Squire Richard H.,
March Norman H.,
Minnick Rebecca A.,
Turschmann Richard
Publication year - 2013
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.24423
Subject(s) - coherence (philosophical gambling strategy) , casimir effect , polariton , coherent states , superfluidity , physics , quantum , statistical physics , energy transfer , boson , degree of coherence , quantum mechanics , theoretical physics , condensed matter physics , chemical physics
Coherence is a collective property that is present in Bose–Einstein condensates (BEC), an example of which when charged is superconductivity (SC). Coherence is also believed to be present to a degree in highly efficient energy transfer in certain biological systems. Attributes of coherent systems are examined in BEC, superfluidity and Bardeen, Cooper, and Schrieffer SC and a laser in part 1. Part 2 consists of examination of various proposals for coherence including “emergent coherent systems” where there may be coherence but no phase transition. We discuss “cold” atomic gases, the Casimir effect, an extended version of Förster's resonance energy transfer, Fröhlich's model, exciton‐coupled quantum wells, and conceptually “old” polaritons rejuvenated by new developments. A discussion about highly efficient energy transfer in photosynthesis along with our proposal for a possible new model for this system is the last of the examples. We finish with a discussion about emergent coherent systems and attempt to classify the examples of parts 1 and 2. © 2013 Wiley Periodicals, Inc.