Dynamic structure factor of a one-dimensional Peierls system

Tutiš, Eduard and Barišić, Slaven (1991) Dynamic structure factor of a one-dimensional Peierls system. Physical Review B, 43 (10). pp. 8431-8436. ISSN 1098-0121

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The Newtonian dynamics of a one-dimensional system with a complex order parameter and an anharmonic potential energy of the Landau type is examined in a wide temperature range using numerical Monte Carlo–molecular dynamics simulations. Results are discussed with an emphasis on the incommensurate Peierls systems. Dispersive-mode behavior found previously in the quartic region near TMF can be followed to lower temperatures where the frequency of the phonon mode decreases and the damping increases. Below 0.4TMF the dynamic structure factor is characterized by the overdamped mode down to 0.3TMF, when the separation between the phase and the amplitude mode becomes effective. The relation between the different regimes in S(k,ω) and the pseudogap in the electronic spectrum is also briefly discussed.

Item Type: Article
Keywords: Peierls instability, one-dimensional, unharmonic, ampliton, phason, lattice softening, molecular dynamics, unharmonicity
Date: April 1991
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1991) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jul 2014 11:20
Last Modified: 10 Jul 2014 11:20
URI: http://digre.pmf.unizg.hr/id/eprint/1468

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