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Physica B Condensed Matter

Correlation gap in one-dimensional quarter-filled electron system

Masahisa Tsuchiizu, Hideo Yoshioka, Yoshikazu Suzumura

Published Jul 1, 2000• 6 citations
Publisher
DOI
10.1016/s0921-4526(99)02782-9

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We examine effects of the next-nearest-neighbor repulsion on electronic states of a one-dimensional interacting electron system which consists of quarter-filled band and interactions of on-site and nearest-neighbor repulsion. We derive the effective Hamiltonian for the electrons around wave number $\pm \kf$ ($\kf$: Fermi wave number) and apply the renormalization group method to the bosonized Hamiltonian. It is shown that the next-nearest-neighbor repulsion makes $4\kf$-charge ordering unstable and suppresses the spin fluctuation. Further the excitation gaps and spin susceptibility are also evaluated.