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Ultrafast electronic state conversion at room temperature utilizing hidden state in cuprate ladder system
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Journal Article
Ultrafast electronic state conversion at room temperature utilizing hidden state in cuprate ladder system
2015
Overview
Photo-control of material properties on femto- (10
−15
) and pico- (10
−12
) second timescales at room temperature has been a long-sought goal of materials science. Here we demonstrate a unique ultrafast conversion between the metallic and insulating state and the emergence of a hidden insulating state by tuning the carrier coherence in a wide temperature range in the two-leg ladder superconductor Sr
14-x
Ca
x
Cu
24
O
41
through femtosecond time-resolved reflection spectroscopy. We also propose a theoretical scenario that can explain the experimental results. The calculations indicate that the holes injected by the ultrashort light reduce the coherence among the inherent hole pairs and result in suppression of conductivity, which is opposite to the conventional photocarrier-doping mechanism. By using trains of ultrashort laser pulses, we successively tune the carrier coherence to within 1 picosecond. Control of hole-pair coherence is shown to be a realistic strategy for tuning the electronic state on ultrafast timescales at room temperature.
Controlling material properties on sub-picosecond scales using photons could allow for ultrafast optoelectronic devices. Here, the authors propose an ultrafast photoinduced metal-to-insulator transition in a two-leg ladder cuprate superconductor based on time-resolved reflection spectroscopy.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
Subject
