Signature of stripe pinning in optical conductivity

Abstract

The response of charge stripes to an external electric field applied perpendicular to the stripe direction is studied within a diagrammatic approach for both weak and strong pinning by random impurities. The sound-like mode of the stripes described as elastic strings moves to finite frequency due to impurity pinning. By calculating the optical conductivity we determine this characteristic energy scale for both a single stripe and an array of interacting stripes. The results explain the anomalous far-infrared peak observed recently in optical-conductivity measurements on cuprates.

Revised version, to appear in Phys. Rev. B

References in corpus (4)

• Infrared signatures of charge stripes in La(2-x)Sr(x)CuO(4)
• Dynamics of metallic stripes in cuprates
• Anomalous optical absorption in overdoped cuprates near the charge-ordering instability
• Low-frequency dynamics of disordered XY spin chains and pinned density waves: from localized spin waves to soliton tunneling

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• The infrared conductivity of Na${}_x$CoO${}_2$: evidence of gapped states
• Ward identity and optical-conductivity sum rule in the d-density wave state
• Optical-conductivity sum rule in cuprates and unconventional charge density waves: a short review
• Effects of Superconductivity and Charge Order on the sub-Terahertz reflectivity of La${}_{1.875}$Ba${}_{0.125-y}$Sr${}_y$CuO${}_4$
• Reflectivity measurements in uniaxial superconductors: a methodological discussion applied to the case of La(2-x)Sr(x)CuO(4)
• Optical conductivity of Bose droplets in quenched disorder at T = 0: the effects of structure factor
• Optical response for a discrete stripe