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Effective holographic theory of charge density waves
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.
2018 (engelsk)Inngår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, nr 8, artikkel-id 086017Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We use gauge/gravity duality to write down an effective low energy holographic theory of charge density waves. We consider a simple gravity model which breaks translations spontaneously in the dual field theory in a homogeneous manner, capturing the low energy dynamics of phonons coupled to conserved currents. We first focus on the leading two-derivative action, which leads to excited states with nonzero strain. We show that including subleading quartic derivative terms leads to dynamical instabilities of AdS2 translation invariant states and to stable phases breaking translations spontaneously. We compute analytically the real part of the electric conductivity. The model allows to construct Lifshitz-like hyperscaling violating quantum critical ground states breaking translations spontaneously. At these critical points, the real part of the dc conductivity can be metallic or insulating.

sted, utgiver, år, opplag, sider
American Physical Society, 2018. Vol. 97, nr 8, artikkel-id 086017
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-228924DOI: 10.1103/PhysRevD.97.086017ISI: 000432961200013Scopus ID: 2-s2.0-85046293438OAI: oai:DiVA.org:kth-228924DiVA, id: diva2:1211175
Forskningsfinansiär
EU, FP7, Seventh Framework Programme, 317089 CERN/FIS-NUC/0045/2015
Merknad

QC 20180530

Tilgjengelig fra: 2018-05-30 Laget: 2018-05-30 Sist oppdatert: 2018-06-20bibliografisk kontrollert

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