Interplay between Correlated Electrons and Quantum Phonons in Charge-Ordered and Mott-Insulating Organic Compounds

• Authors: K. Yonemitsu , N. Maeshima , Y. Tanaka
• Languages of publication: EN

Abstracts

EN

At an early stage of the photoinduced transition from an insulator to a metal in quasi-two-dimensional organic conductors, a coherent motion of electrons is observed in a charge-ordered insulator, but not so far in a Mott insulator. The mechanisms of these different photoinduced charge dynamics are theoretically studied by numerical solutions to the time-dependent Schrödinger equation for exact many-electron-phonon wave functions on small clusters of model systems. We use two-dimensional three-quarter-filled extended Holstein-Hubbard models on anisotropic triangular lattices. For a charge-ordered insulator on a lattice simplified from the structure of α-(BEDT-TTF)_2I_3, we indeed find a low-energy collective electronic motion coupled with quantum phonons even if the energy of photoexcitation is away from this energy. For a Mott insulator on a lattice simplified from the structure of κ-(BEDT-TTF)_2X, however, such a collective motion does not appear, and quantum phonons are hardly excited.

Keywords

EN

78.20.Bh; 71.30.+h; 71.45.Lr; 71.10.Fd

Discipline

• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 71.45.Lr: Charge-density-wave systems(see also 75.30.Fv Spin-density waves)
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 78.20.Bh: Theory, models, and numerical simulation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 372-374

Dates

published

2012-02

Contributors

author

K. Yonemitsu

• Institute for Molecular Science, Okazaki 444-8585, Japan
• Graduate University for Advanced Studies, Okazaki 444-8585, Japan
• JST, CREST, Tokyo 102-0076, Japan

author

N. Maeshima

• Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan
• Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan

author

Y. Tanaka

• Institute for Molecular Science, Okazaki 444-8585, Japan
• Graduate University for Advanced Studies, Okazaki 444-8585, Japan
• JST, CREST, Tokyo 102-0076, Japan

References

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Identifiers

DOI

10.12693/APhysPolA.121.372