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  Anomalous Terahertz Emission in Striped Cuprates

Nicoletti, D., Buzzi, M., Fechner, M., Dolgirev, P. E., Michael, M. H., Curtis, J. B., et al. (2021). Anomalous Terahertz Emission in Striped Cuprates.

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2111.14904.pdf (Preprint), 7MB
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https://arxiv.org/abs/2111.14904 (Preprint)
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 Creators:
Nicoletti, D.1, Author              
Buzzi, M.1, Author              
Fechner, M.1, Author              
Dolgirev, P. E.2, Author
Michael, M. H.1, 2, Author
Curtis, J. B.2, 3, Author
Demler, E.4, Author
Gu, G. D.5, Author
Cavalleri, A.1, 6, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Department of Physics, Harvard University, ou_persistent22              
3John A. Paulson School of Engineering and Applied Sciences, Harvard University, ou_persistent22              
4Institute for Theoretical Physics, ETH Zurich, ou_persistent22              
5Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, ou_persistent22              
6Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22              

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
 Abstract: Terahertz emission is observed after impulsive optical excitation only in media in which inversion or time-reversal symmetry are broken. For this reason, in centrosymmetric superconductors this phenomenon is generally not seen, unless a current bias or a magnetic field are applied. Here, we report evidence for anomalous terahertz emission in unbiased cuprates in which charge stripes coexist with superconductivity. Emission is only observed when stripes are either incommensurate with the lattice or fluctuating, such as in La1.905Ba0.095CuO4 (x=9.5%) and in La1.845Ba0.155CuO4 (x=15.5%). A sharp response at frequencies immediately below the bulk Josephson plasma resonance suggests that this radiation originates from surface Josephson plasmons, which are generally dark modes but appear to be coupled to the electromagnetic continuum in these materials. We attribute this activated anomalous emission to the fact that incommensurate stripes break inversion symmetry in the out-of-plane direction and fold the plasmon dispersion curve onto the light cone.

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Language(s): eng - English
 Dates: 2021-11-29
 Publication Status: Published online
 Pages: 21
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2111.14904
 Degree: -

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