Transverse collective modes in interacting holographic plasmas
Entity
UAM. Departamento de Física TeóricaPublisher
SpringerDate
2020-04-17Citation
10.1007/JHEP04(2020)106
Journal of High Energy Physics 2020.4 (2020): 106
ISSN
1029-8479 (online); 1126-6708 (online)DOI
10.1007/JHEP04(2020)106Funded by
M.B. acknowledges the support of the Spanish MINECO’s “Centro de Excelencia Severo Ochoa” Programme under grant SEV-2012-0249. U.G. and M.T. are supported by the Swedish Research CouncilProject
Gobierno de España. SEV-2012-0249Editor's Version
https://dx.doi.org/10.1007/JHEP04(2020)106Subjects
Gauge-gravity correspondence; Holography and condensed matter physics (AdS/CMT); FísicaRights
© 2020, The Author(s)Abstract
We study in detail the transverse collective modes of simple holographic models in presence of electromagnetic Coulomb interactions. We render the Maxwell gauge field dynamical via mixed boundary conditions, corresponding to a double trace deformation in the boundary field theory. We consider three different situations: (i) a holographic plasma with conserved momentum, (ii) a holographic (dirty) plasma with finite momentum relaxation and (iii) a holographic viscoelastic plasma with propagating transverse phonons. We observe two interesting new features induced by the Coulomb interactions: a mode repulsion between the shear mode and the photon mode at finite momentum relaxation, and a propagation-to-diffusion crossover of the transverse collective modes induced by the finite electromagnetic interactions. Finally, at large charge density, our results are in agreement with the transverse collective mode spectrum of a charged Fermi liquid for strong interaction between quasi-particles, but with an important difference: the gapped photon mode is damped even at zero momentum. This property, usually referred to as anomalous attenuation, is produced by the interaction with a quantum critical continuum of states and might be experimentally observable in strongly correlated materials close to quantum criticality, e.g. in strange metals
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Google Scholar:Baggioli, Matteo
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Gran, Ulf
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Tornsö, Marcus
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