title: Two interacting helical edge modes in quantum spin Hall systems.
abstract: We study theoretically two interacting one-dimensional helical modes at the edges of the quantum spin Hall systems. A new type of interedge correlated liquid without a spin gap is found when the intraedge repulsion is stronger than the interedge repulsion. This liquid shows a diverging density wave and superconductivity correlations much stronger than those of the spinfull electrons. Possible experimental observations are also discussed.
authors.affiliation: Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa