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Andreas Mielke
Institut for Theoretical Physics
Ruprecht-Karls University
Philosophenweg 19
D-69120 Heidelberg
Germany
Tel.: ++49 6221 549431 (Secretary)
Fax: ++49 6221 549331
e-mail:
mielke@tphys.uni-heidelberg.de
Andreas Mielke: Pair formation of hard core bosons in flat band systems
J Stat Phys.171,
679-695
(2018)
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Abstract
Hard core bosons in a large class of one or two dimensional flat band systems have an upper critical density, below which the ground states can be described completely. At the critical density, the ground states are Wigner crystals. If one adds a particle to the system at the critical density, the ground state and the low lying multi particle states of the system can be described as a Wigner crystal with an additional pair of particles. The energy band for the pair is separated from the rest of the multi-particle spectrum. The proofs use a Gerschgorin type of argument for block diagonally dominant matrices. In certain one-dimensional or tree-like structures one can show that the pair is localised, for example in the chequerboard chain. For this one-dimensional system with periodic boundary condition the energy band for the pair is flat, the pair is localised.
BibTeX-entry
@article{Mielke2018,
author="Andreas Mielke",
title="Pair formation of hard core bosons in flat band systems",
journal="J Stat Phys.",
volume="171",
pages="679-695",
year="2018"
}
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Last changes: 2.9.2024.
mielke@tphys.uni-heidelberg.de
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