Integrated optics-based quantum communication devices

Ramakrishnan, Rohit K.; Samad, Shafeek A.; Archana, K.; Yadunath, T R; Das, Partha Pratim; Srinivas, T.

doi:10.1117/12.2251091

Cited by 2 publications

(2 citation statements)

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“…The method 38,39,[56][57][58][59][60][61] includes rewriting the quartic fermion interaction in terms of auxiliary fields corresponding to charge and spin degrees of freedom. However, the resulting problem is still a many-body one, albeit with new fields.…”

Section: Introductionmentioning

confidence: 99%

“…However, the resulting problem is still a many-body one, albeit with new fields. To simplify matters, we concentrate on the static part of these fields 60,61 and also assume that the phonons are static. This results in a problem of a single-band electron moving in the background of three classical fields: the charge and magnetization auxiliary fields and lattice displacements.…”

Section: Introductionmentioning

confidence: 99%

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Holstein-Hubbard model at half filling: A static auxiliary field study

Pradhan

Pai

2015

Phys. Rev. B

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We study the Holstein-Hubbard model at half filling to explore the ordered phases such as the charge density wave and antiferromagnet. The Coulomb interaction is rewritten in terms of auxiliary fields. By treating the auxiliary fields and phonons as classical, we obtain real space features of the system and transition between the phases from weak to strong coupling. When both interactions are weak, mutual competition between them leads to a metallic phase in an otherwise insulator dominated phase diagram. Spatial correlations induced by thermal fluctuations lead to pseudogap features at intermediate range of coupling.

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