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Pump- and Probe-polarization Analyses of Ultrafast Carrier Dynamics in Organic Superconductors

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Abstract

We investigated photo-excited carrier relaxation dynamics in the strongly correlated organic superconductors κ-(BEDT-TTF)2Cu(NCS)2 and κ-(BEDT-TTF)2Cu[N(CN)2]Br, using different polarizations of pump and probe pulses. Below the glasslike transition temperature (T g) anisotropic responses for probe polarization were observed in both compounds. Decomposing the data into anisotropic and isotropic components, we found the anisotropic component shows no pump polarization dependence, meaning that dissipative excitation process was dominant for the anisotropic carrier relaxation. This behavior indicates that the appearance of anisotropic responses can be associated with spatial symmetry breaking due to structural change of BEDT-TTF molecules.

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Acknowledgments

This work was partially supported by a Grant-in-Aid for Young Scientists B (No. 15K17685) from the Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    K. Nakagawa, S. Tsuchiya & Y. Toda

  2. Graduate School of Material Science, University of Hyogo, Ako-gun, Hyogo, 678-1297, Japan

    J. Yamada

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  1. K. Nakagawa
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  2. S. Tsuchiya
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  3. J. Yamada
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  4. Y. Toda
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Correspondence to K. Nakagawa.

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Nakagawa, K., Tsuchiya, S., Yamada, J. et al. Pump- and Probe-polarization Analyses of Ultrafast Carrier Dynamics in Organic Superconductors. J Supercond Nov Magn 29, 3065–3069 (2016). https://doi.org/10.1007/s10948-016-3741-6

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  • DOI: https://doi.org/10.1007/s10948-016-3741-6

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