Collective mode dispersions of organic chain compounds

• Autorzy: Željana Lošić , Paško Županović
• Języki publikacji: EN

Abstrakty

EN

We investigate the collective mode dispersions for the tight-binding dielectric matrix with two one-dimensional electron bands per donor and acceptor chains, and the three-dimensional long-range Coulomb electron-electron interaction within the random phase approximation. The hybridized collective modes are the result of the strong coupling between the intraband plasmon and the interband dipolar modes due to strong dipole Coulomb interactions. Our calculations show the existence of the low-energy renormalized plasmon mode above the electron-hole quasi-continuum in the long wavelength limit. The obtained modes are brought into correspondence with the optical data of quasi-one-dimensional organic conductor tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ). Namely, the renormalized plasmon and the dipolar mode are assigned to the observed excitations at respective energy scales of roughly 10 meV and 0.75 eV, explaining why lower excitation is eliminated while higher excitation persists below the temperature of the Peierls phase transition.

Słowa kluczowe

EN

dielectric response; collective modes

• Czasopismo: Open Physics
• Rocznik: 2010
• Tom: 8
• Numer: 3
• Strony: 283-288

Daty

wydano

2010-06-01

online

2010-04-24

Twórcy

autor

Željana Lošić

• Faculty of Science, University of Split, Teslina 12, 21000, Split, Croatia,

autor

Paško Županović

• Faculty of Science, University of Split, Teslina 12, 21000, Split, Croatia,

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Identyfikatory

DOI

10.2478/s11534-009-0113-x