K. A. Matveev, A. Furusaki
Published 2008-08-05, updated 2008-08-12Version 2
We study a system of one-dimensional (iso)spin-1/2 bosons in the regime of strong repulsive interactions. We argue that the low-energy spectrum of the system consists of acoustic density waves and the spin excitations described by an effective ferromagnetic spin chain with a small exchange constant J. We use this description to compute the dynamic spin structure factor and the spectral functions of the system.
Comments: reference added
Journal: Phys. Rev. Lett. 101, 170403 (2008)
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