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Ultrafast Dynamics of Photoinduced Electronic Phase Modulation in Ladder Cuprate of Sr_{14 - x}Ca_{x}Cu_{24}O_{41}

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Fukaya R., Kunitomo M., Okimoto Y., Ishikawa T., Onda K., Koshihara S., Yui H., Sasagawa T.

Acta Physica Polonica A

2012

vol. 121

issue 2

310-312

Ultrafast carrier dynamics caused by photoexcitation in quasi-one-dimensional two-leg ladder cuprate Sr_4Ca_{10}Cu_{24}O_{41} was investigated by the femtosecond reflection spectroscopy. After the photoexcitation along the leg direction, the transient reflectivity changes (Δ R/R) in the mid-infrared region showed instant decrease within 150 fs. The suppressed Δ R/R increased so rapidly on the picosecond time scale that the reflectivity value finally became larger than that in the initial state. Such a successive response in Δ R/R, which was also observed in other photon energy regions, is discussed in terms of ultrafast variation of the Drude weight in the ladder system by the photoirradiation.

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1 Acta Physica Polonica A

1 2012

1 Fukaya R.

1 Ishikawa T.

1 Koshihara S.

1 Kunitomo M.

1 Okimoto Y.

1 Onda K.

1 Sasagawa T.

1 Yui H.

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Ultrafast Dynamics of Photoinduced Electronic Phase Modulation in Ladder Cuprate of Sr_{14 - x}Ca_{x}Cu_{24}O_{41}