Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Quantum Liquids, Miscellaneous 2
TT 19.4: Vortrag
Montag, 11. März 2013, 15:45–16:00, H21
Propagation of lines of excitations in the two-species Bose Hubbard model — •Carlo Krimphoff1, Masud Haque2, and Andreas M. Läuchli1 — 1Institut für Theoretische Physik, Universität Innsbruck, Österreich — 2Max-Planck-Institut für Physik komlexer Systeme, Dresden, Deutschland
We investigate numerically and analytically the time evolution of lines of overturned spins in the one and two-dimensional spin-1/2 Heisenberg XXZ model after a local quench of the magnetic field. In one dimension a rich sequence of bound states has already been observed, and these states propagate at different velocities. We investigate here how this picture changes and enriches as we move from decoupled one-dimensional chains towards the two-dimensional plane.
As the spin-1/2 Heisenberg model is the strong coupling limit of the two-species Bose Hubbard model at unit filling, our results will shed light on the expected dynamics of lines of mobile spin impurities in two-species bosonic atoms confined to a two-dimensional optical lattice.