Theory for anomalous terahertz emission in striped cuprate superconductors
Pavel E. Dolgirev, Marios H. Michael, Jonathan B. Curtis, Daniele Nicoletti, Michele Buzzi, Michael Fechner, Andrea Cavalleri, Eugene Demler
DOI 10.1103/PhysRevB.108.L180508 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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