title: Cooperative density wave and giant spin gap in the quarter-filled zigzag electron ladder.
abstract: Strong cooperative interactions occur between four different broken symmetries involving charge ordering and bond distortions in the quarter-filled correlated zigzag electron ladder. The ground state is singlet, with spin gap several times larger than in the spin-Peierls state of the one-dimensional quarter-filled chain with the same parameters. We propose the quarter-filled zigzag electron ladder model for several different organic charge transfer solids with coupled pairs of quasi-one-dimensional stacks, in which the spin-gap transition temperatures are unusually high.
authors.affiliation: Department of Physics and Astronomy and ERC Center for Computational Sciences, Mississippi State University, Mississippi State, Mississippi 39762, USA.
authors.forename: R T
authors.initials: RT
authors.lastname: Clay
authors.forename: S
authors.initials: S
authors.lastname: Mazumdar