Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 38: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...
TT 38.4: Talk
Friday, February 29, 2008, 11:00–11:15, H 3010
Spin - charge separation in ultracold two-component Bose-gases — •Adrian Kleine1, Corinna Kollath2, Ian P. McCulloch3, Thierry Giamarchi2, and Ulrich Schollwöck1 — 1Institut für Theoretische Physik C, RWTH Aachen, D-52056 Aachen, Germany — 2DPMC-MaNEP, University of Geneva, CH-1211 Geneva, Switzerland — 3School of Physical Sciences, University of Queensland, Brisbane, Qld 4072, Australia
The experimental search for signatures of spin-charge separation, a hallmark feature of one-dimensional interacting electron systems, is a key topic in strongly correlated electron physics. The recent progress in ultracold atom realizations allows for both interaction parameters to be fine-tuned and to trap atoms in quasi one dimensional set-ups, hence opening a novel path towards the observation of spin charge separation. Here we theoretically study a two-component system of bosonic ultracold atoms in the framework of the Bose-Hubbard model. We show that even close to a competing phase separation regime, such a model features spin charge separation [1]. To this end, we determine the real-time evolution of a single particle excitation and the single-particle spectral function using density-matrix renormalization group techniques. In anticipation of experimental realizations we calculate the velocities for spin and charge perturbations for a wide range of parameters.
[1] A. Kleine et al. to appear in Phys. Rev. A, preprint arXiv:0706.0709