Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-01-30
Phys. Rev. B 64, 125123 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
REVTeX, 11 pages, 9 figures
Scientific paper
10.1103/PhysRevB.64.125123
We study spin fluctuations in quarter-filled one-dimensional spin-density-wave systems in presence of short-range Coulomb interactions. By applying a path integral method, the spin-wave velocity is calculated as a function of on-site (U), nearest (V) and next-nearest (V_2) neighbor-site interactions. With increasing V or V_2, the pure spin-density-wave state evolves into a state with coexisting spin- and charge-density waves. The spin-wave velocity is reduced when several density waves coexist in the ground state, and may even vanish at large V. The effect of dimerization along the chain is also considered.
Dupuis N.
Suzumura Yoshikazu
Tomio Yuh
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