Terahertz time-domain spectroscopy of transient metallic and superconducting states

Abstract

Time-resolved terahertz time-domain spectroscopy (THz-TDS) is an ideal tool for probing photoinduced nonequilibrium metallic and superconducting states. Here, we focus on the interpretation of the two-dimensional response function $\Sigma (\omega ;t)$ that it measures, examining whether it provides an accurate snapshot of the instantaneous optical conductivity, $\sigma (\omega ;t)$. For the Drude model with a time-dependent carrier density, we show that $\Sigma (\omega ;t)$ is not simply related to $\sigma (\omega ;t)$. The difference in the two response functions is most pronounced when the momentum relaxation rate of photocarriers is long, as would be the case in a system that becomes superconducting following pulsed photoexcitation. From the analysis of our model, we identify signatures of photoinduced superconductivity that could be seen by time-resolved THz-TDS.

Replaced Fig. 4; minor revisions to captions, text, and bibliography

References in corpus (1)

• Electrodynamics of Correlated Electron Materials

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