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Ultrafast charge dynamics in photoexcited Nd_2CuO_4 and La_2CuO_4 cuprate compounds investigated by femtosecond absorption spectroscopy

机译:飞秒吸收光谱法研究光激发的Nd_2CuO_4和La_2CuO_4铜酸盐化合物中的超快电荷动力学

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摘要

Charge and lattice dynamics caused by photocarrier doping of the undoped cuprates Nd_2CuO_4 and La_2CuO_4 were studied by femtosecond absorption spectroscopy. In both compounds, a metallic state is formed just after photoexcitation and decays within ~200 fs. Photogenerated electrons and holes are subsequently localized due to charge-spin coupling, producing midgap absorptions at different energies. Charge-phonon coupling also occurs in both compounds. This is more significant for La_2CuO_4 than for Nd_2CuO_4, and leads to higher midgap absorption energies, and slower recombination of polaronic carriers. The role of apical oxygen atoms in charge-phonon coupling in La_2CuO_4 is also discussed.
机译:通过飞秒吸收光谱研究了未掺杂铜酸盐Nd_2CuO_4和La_2CuO_4的光载流子掺杂引起的电荷和晶格动力学。在这两种化合物中,金属态都是在光激发后立即形成的,并在〜200 fs内衰减。由于电荷自旋耦合,光生电子和空穴随后被定位,从而在不同能量下产生中能隙吸收。两种化合物中也会发生电荷-声子耦合。对于La_2CuO_4,这比对Nd_2CuO_4更为重要,并导致更高的中能隙吸收能和极化子载流子的重组速度变慢。还讨论了顶端氧原子在La_2CuO_4中的电荷-声子偶联中的作用。

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  • 来源
    《Physical review》 |2010年第6期|p.060513.1-060513.4|共4页
  • 作者单位

    Department of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan;

    rnDepartment of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan;

    rnDepartment of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan;

    rnDepartment of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan;

    rnDepartment of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan;

    rnDepartment of Advanced Materials Science, University of Tokyo, Chiha 277-8561, Japan;

    rnCREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan;

    rnNational Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan;

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  • 正文语种 eng
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  • 关键词

    polarons and electron-phonon interactions; cuprate superconductors (high-Tc and insulating parent compounds);

    机译:极化子和电子-声子相互作用;铜酸盐超导体(高Tc和绝缘母体化合物);

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