Volume 75, Number 1, July 2006
|Page(s)||133 - 138|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||31 May 2006|
On confined fractional charges: A simple model
Max-Planck-Institut für Physik komplexer Systeme Nöthnitzer-Str. 38, 01187 Dresden, Germany
Accepted: 15 May 2006
We address the question whether features known from quantum chromodynamics (QCD) can possibly also show up in solid-state physics. It is shown that spinless fermions of charge e on a checkerboard lattice with nearest-neighbor repulsion provide for a simple model of confined fractional charges. After defining a proper vacuum the system supports excitations with charges attached to the ends of strings. There is a constant confining force acting between the fractional charges. It results from a reduction of vacuum fluctuations and a polarization of the vacuum in the vicinity of the connecting strings.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.10.-w – Theories and models of many-electron systems
© EDP Sciences, 2006
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