Zi Cai, Congjun Wu, U. Schollwöck
Due to the mechanism of confinement, as known from quantum chromodynamics, it
is difficult to observe individual particles carrying fractional quantum number
(e.g. quark with fractional electric charge). A condensed matter example of
fractionalized particles is spinons in quasi-one-dimensional spin systems,
which are domain walls in the background of Neel configurations carrying
spin-1/2. Using the time-evolving block decimation algorithm, we visualize the
nontrivial domain wall dynamics induced by the confine mechanism in a two-leg
spin-1/2 ladder. It can be illustrated by a simple single-particle picture of
Bloch oscillation, not only qualitatively but also quantitatively. We propose
the experimental realization and the real time detection of the domain wall
dynamics in the ultra-cold boson systems of $^{87}$Rb.
View original:
http://arxiv.org/abs/1111.0275
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