title: Persistent spin currents without spin-orbit coupling in a spin-1/2 ring.
abstract: We show that a spatially dependent magnetic field can induce a persistent spin current in a spin-1/2 Heisenberg antiferromagnetic ring, proportional to the solid angle subtended by the magnetic field on a unit sphere. The magnitude of the spin current is determined by the ratio of longitudinal and transverse exchange interactions J(parallel)/J(perpendicular) and by the magnetic field magnitude.
authors.affiliation: Department of Physics, City College of the City University of New York, New York, New York 10031, USA. david@sci.ccny.cuny.edu
authors.forename: D
authors.initials: D
authors.lastname: Schmeltzer
authors.forename: A
authors.initials: A
authors.lastname: Saxena
authors.forename: A R
authors.initials: AR
authors.lastname: Bishop
authors.forename: D L
authors.initials: DL
authors.lastname: Smith