title: Spin-chirality duality in a spin ladder with four-spin cyclic exchange.
abstract: Effect of four-spin cyclic exchange on magnetism is studied in the two-leg S=1/2 ladder. We develop an exact spin-chirality duality transformation, under which the system is self-dual when the four-spin exchange J4 is half of the two-spin exchange. Using the density-matrix renormalization-group method and the duality relation, we find that the four-spin exchange makes the vector-chirality correlation dominant. A "chirality short-range resonating-valence-bond" phase is identified for the first time at large J4.
authors.affiliation: Computational Materials Science Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Toshiya
authors.initials: T
authors.lastname: Hikihara
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Momoi
authors.forename: Xiao
authors.initials: X
authors.lastname: Hu