Electromagnetic modes from Stoner enhancement

Systems with substantial spin fluctuations, can internally dress the polarization function by ladder diagram of Stoner (spin-flip) excitations. This process can drastically modify the electromagnetic response. As a case study we provide detailed analysis of the corrections to the non-local optical c...

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Bibliographic Details
Published inarXiv.org
Main Authors Jalali-Mola, Z, Jafari, S A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.03.2018
Subjects
Excitation
Graphene
Ladder diagrams
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Physics - Strongly Correlated Electrons
Variations
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Summary:Systems with substantial spin fluctuations, can internally dress the polarization function by ladder diagram of Stoner (spin-flip) excitations. This process can drastically modify the electromagnetic response. As a case study we provide detailed analysis of the corrections to the non-local optical conductivity of both doped and undoped graphene. While the resummation of ladder diagram of Stoner excitations does not affect the TE mode in doped graphene, it allows for a new undampled TM mode in undoped graphene. This is the sole effect of corrections arising from ladder diagrams and is dominated by Stoner excitations along the ladder rung which goes away by turning off the source of spin-flip interactions. This can be considered as a direct probe of the spin fluctuations.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.04575