| Issue |
Europhys. Lett.
Volume 75, Number 1, July 2006
|
|
|---|---|---|
| Page(s) | 133 - 138 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2006-10092-x | |
| 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
Received:
28
March
2006
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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