Effects of Charge Ordering on Spin-Wave of Quarter-Filled Spin-Density-Wave States

Details Effects of Charge Ordering on Spin-Wave of Quarter-Filled Spin-Density-Wave States Effects of Charge Ordering on Spin-Wave of Quarter-Filled Spin-Density-Wave States

2002-02-14

arxiv.org/abs/cond-mat/0202227v2

J. Phys. Soc. Jpn. 71, 1174 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 11 figures

Scientific paper

10.1143/JPSJ.71.1174

Spin-wave excitations of quarter-filled spin-density-wave state, which coexists with charge ordering, have been studied for one-dimensional extended Hubbard model with the nearest-neighbor repulsive interaction (V) and next-nearest-neighbor one (V_2). We calculate dispersion relations for the acoustic and optical spin-wave within the random phase approximation. Our numerical calculation shows that energy spectrum of the acoustic branch is well described by a simple sine function form. In the states coexisting with charge-density-wave, the spin-wave velocity decreases with increasing V or V_2. Our numerical result, that velocity reduces to zero in the limit of large V or V_2, is analyzed in terms of a spin 1/2 Heisenberg model with effective antiferromagnetic exchange interaction.

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