Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 110401 |
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<mark>Journal publication date</mark> | 11/09/2009 |
<mark>Journal</mark> | Physical review letters |
Issue number | 11 |
Volume | 103 |
Number of pages | 4 |
Pages (from-to) | - |
Publication Status | Published |
<mark>Original language</mark> | English |
We investigate the dynamics of the one-dimensional strongly repulsive spin-1/2 Bose-Hubbard model for filling nu <= 1. While at nu = 1 the system is a Hubbard-Mott insulator exhibiting dynamical properties of the Heisenberg ferromagnet, at nu < 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.