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We investigate magnetic excitations and spin transport properties of afrustrated spin chain with ferromagnetic nearest-neighbor and antiferromagneticnext-nearest-neighbor exchange couplings in a magnetic field by density-matrixrenormalization group methods. In the field-induced quadrupole and octupoleregimes, the low-energy excitation is governed by two- and three-magnon boundstates, respectively, so that bound magnon clusters would contribute to thespin transport. We show that spin current correlations decrease when the systemgoes from the quadrupole regime into the octupole regime. This indicates thatthe spin transport is suppressed in the octupole regime, although boundthree-magnon clusters carry a larger amount of angular momentum than boundtwo-magnon clusters.

Excitation and transport of bound magnon clusters in frustrated ferromagnetic chain