Dimerization-induced spin-charge coupling in one-dimensional Mott insulators revealed by femtosecond reflection spectroscopy of Rb-tetracyanoquinodimethane salts

DOI Web Site Web Site 被引用文献5件 参考文献27件

書誌事項

公開日
2012-03-14
資源種別
journal article
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevb.85.125112
公開者
American Physical Society (APS)

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説明

Effects of lattice dimerizations on charge dynamics in one-dimensional (1D) half-filled Mott insulators were studied using an organic compound, Rb-tetracyanoquinodimethane (TCNQ). First, we investigated the presence of the dimeric molecular displacements by the measurements of polarized Raman spectra and the time evolutions of photoinduced reflectivity changes. The results indicate that Rb-TCNQ shows a spin-Peierls-like structural phase transition and molecular dimerization occurs below 220 K. Second, we performed femtosecond reflection spectroscopy from visible to infrared regions down to 0.1 eV on Rb-TCNQ in both the low-temperature phase with dimerization and the high-temperature phase without dimerization. The results revealed that the molecular dimerization causes splitting of midgap absorption due to photocarriers. Theoretical calculations by the density-matrix renormalization group method reveal that low- and high-energy midgap absorptions are due to pure charge excitation and spin-charge-coupled excitation, respectively, of polarons stabilized by the electron-lattice interaction. This indicates that dimerization breaks the spin-charge separation characteristic of 1D Mott insulators with large electron correlation.

収録刊行物

  • Physical Review B

    Physical Review B 85 (12), 125112-, 2012-03-14

    American Physical Society (APS)

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