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arxiv 1712.10019 v2 pith:KCGCAFO5 submitted 2017-12-28 cond-mat.supr-con cond-mat.mtrl-sci

Identifying a forward scattering superconductor through pump-probe spectroscopy

classification cond-mat.supr-con cond-mat.mtrl-sci
keywords caseforwardscatteringsuperconductingbehaviorcontrastisotropicorder
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Electron-boson scattering that is peaked in the forward direction has been suggested as an essential ingredient for enhanced superconductivity observed in FeSe monolayers. Here, we study the superconducting state of a system dominated by forward scattering in the time-domain and contrast its behavior against the standard isotropic BCS case for both s- and d-wave symmetries. An analysis of the electron's dynamics in the pump-driven non-equilibrium state reveals that the superconducting order in the forward-focused case is robust and persistent against the pump-induced perturbations. The superconducting order parameter also exhibits a non-uniform melting in momentum space. We show that this behavior is in sharp contrast to the isotropic interaction case and propose that time-resolved approaches are a potentially powerful tool to differentiate the nature of the dominant coupling in correlated materials.

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