engleski

Photoemission properties of quasi-one-dimensional conductors

We calculate the one-particle spectral function and the corresponding derived quantities for a chain lattice with a one-dimensional conducting electron band, and with a three-dimensional long-range Coulomb electron-electron interaction treated within the G0W0 approximation. It is shown that due to the anisotropic acoustic dispersion of the plasmon mode, the quasi-particle peak as a standard Fermi liquid feature does not show up in the spectral function. Instead, the latter comprises only a broad maximum with width of the order of plasmon energy. Such spectral properties are in the qualitative agreement with ARPES spectra of Bechgaard salts obtained in recent measurements. The present approach is appropriate for the treatment of wide energy scales defined by the width of the conducting band and the plasmon energy, and is complementary to earlier rigorous results obtained within the Luttinger liquid approach in the asymptotic limit of low energies close to the chemical potential.

photoemission; Green's function; spectral function; plasmon

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