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Journal Article

Theory for anomalous terahertz emission in striped cuprate superconductors

MPS-Authors
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Michael,  M.
Department of Physics, Harvard University ;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Nicoletti,  D.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Buzzi,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Fechner,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Clarendon Laboratory, University of Oxford;

External Resource

https://arxiv.org/abs/2112.05772
(Preprint)

https://doi.org/10.1103/PhysRevB.108.L180508
(Publisher version)

Fulltext (restricted access)
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Fulltext (public)

PhysRevB.108.L180508.pdf
(Publisher version), 722KB

Supplementary Material (public)

Supplement.pdf
(Supplementary material), 498KB

Citation

Dolgirev, P. E., Michael, M., Curtis, J. B., Nicoletti, D., Buzzi, M., Fechner, M., et al. (2023). Theory for anomalous terahertz emission in striped cuprate superconductors. Physical Review B, 108(18): L180508. doi:10.1103/PhysRevB.108.L180508.


Cite as: https://hdl.handle.net/21.11116/0000-0009-A029-4
Abstract
Recent experiments in the doped cuprates La2−xBaxCuO4 have revealed the emission of anomalous terahertz radiation after impulsive optical excitation. Here, we theoretically investigate the nonlinear electrodynamics of such striped superconductors and explore the origin of the observed radiation. We argue that photoexcitation is converted into a photocurrent by a second-order optical nonlinearity, which is activated by the breaking of inversion symmetry in certain stripe configurations. We point out the importance of including umklapp photocurrents modulated at the stripe periodicity itself, which impulsively drive surface Josephson plasmons and lead to a resonant structure of outgoing radiation, consistent with the experiments. We speculate on the utility of the proposed mechanism in the context of generating tunable terahertz radiation.