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Dynamical Properties of the One-Dimensional Spin-1/2 Bose-Hubbard Model near a Mott-Insulator to Ferromagnetic-Liquid Transition

Authors
Cheianov, V. V.
Published in Physical Review Letters. 2009, vol. 103, no. 11
Abstract We investigate the dynamics of the one-dimensional strongly repulsive spin-1/2 Bose-Hubbard model for filling ν≤1. While at ν=1 the system is a Hubbard-Mott insulator exhibiting dynamical properties of the Heisenberg ferromagnet, at ν<1 it is a ferromagnetic liquid with complex spin dynamics. We find that close to the insulator-liquid transition the system admits for a complete separation of spin and density degrees of freedom valid at all energy and momentum scales within the t-J approximation. This allows us to derive the propagator of transverse spin waves and the shape of the magnon peak in the dynamic spin structure factor.
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PMID: 19792352
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ZVONAREV, Mikhail, CHEIANOV, V. V., GIAMARCHI, Thierry. Dynamical Properties of the One-Dimensional Spin-1/2 Bose-Hubbard Model near a Mott-Insulator to Ferromagnetic-Liquid Transition. In: Physical Review Letters, 2009, vol. 103, n° 11. https://archive-ouverte.unige.ch/unige:36016

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Deposited on : 2014-04-28

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