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arXiv:cond-mat/9904150 · The European Physical Journal B

Single hole dynamics in the one-dimensional - model

M. Brunner, Fakher F. Assaad, A. Muramatsu

Published Jul 1, 2000• 24 citations
arXivHTMLPDF
DOI
10.1007/s100510070220

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We obtain an exact result on the single-hole dynamics in one-dimensional Mott-Hubbard insulators through a study of the supersymmetric $t\ensuremath{-}J$ model with long-range interaction at half filling. We calculate the expression G1s1h(x,t){G}_{1s1h}(x,t)G1s1h​(x,t) for the one-spinon one-holon contribution to the hole propagator, which contributes 7575%75 of the total spectral weight. The matrix element is independent of the holon momentum. The spectral weight has an inverse square root singularity along the holon band. Comparison with the hole dynamics of the $U\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\infty}$ Hubbard model is also made.
Dynamics of a single hole in the t−Jt-Jt−J model
We study nonequilibrium dynamics in the one-dimensional Bose-Hubbard model starting from an initial product state with one boson per site and a single-hole defect. We find that for parameters close to the quantum critical point, the hole splits into a core showing a very slow diffusive dynamics, and a fast mode which propagates ballistically. Using an effective fermionic model at large Hubbard interactions UUU, we show that the ballistic mode is a consequence of an interference between slow-holon and fast-doublon dynamics, which occurs once the hole defect starts propagating into the bosonic background at unit filling. Within this model, the signal velocity of the fast ballistic mode is given by the maximum slope of the dispersion of the doublon quasiparticle in good agreement with the numerical data. Furthermore, we contrast this global quench with the dynamics of a single-hole defect in the ground state of the Bose-Hubbard model and show that the dynamics in the latter case is very different even for large values of UUU. This can also be seen in the entanglement entropy of the time-evolved states which grows much more rapidly in time in the global quench case.