title: Spin nematic order in multiple-spin exchange models on the triangular lattice.
abstract: We figure out that the ground state of a multiple-spin exchange model applicable to thin films of solid {3}He possesses an octahedral spin nematic order. In the presence of a magnetic field, it is deformed into an antiferroquadrupolar order in the perpendicular spin plane, in which lattice Z{3} rotational symmetry is also broken. Furthermore, this system shows a narrow magnetization plateau at half, m/m{sat}=1/2, which resembles recent magnetization measurements [H. Nema et al., Phys. Rev. Lett. 102, 075301 (2009)].
authors.affiliation: Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Momoi
authors.forename: Philippe
authors.initials: P
authors.lastname: Sindzingre
authors.forename: Kenn
authors.initials: K
authors.lastname: Kubo