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2015 ; 5
(ä): 10824
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Skyrmion Superfluidity in Two-Dimensional Interacting Fermionic Systems
#MMPMID26083978
Palumbo G
; Cirio M
Sci Rep
2015[Jun]; 5
(ä): 10824
PMID26083978
show ga
In this article we describe a multi-layered honeycomb lattice model of
interacting fermions which supports a new kind of parity-preserving skyrmion
superfluidity. We derive the low-energy field theory describing a non-BCS
fermionic superfluid phase by means of functional fermionization. Such effective
theory is a new kind of non-linear sigma model, which we call double skyrmion
model. In the bi-layer case, the quasiparticles of the system (skyrmions) have
bosonic statistics and replace the Cooper-pairs role. Moreover, we show that the
model is also equivalent to a Maxwell-BF theory, which naturally establishes an
effective Meissner effect without requiring a breaking of the gauge symmetry.
Finally, we map effective superfluidity effects to identities among fermionic
observables for the lattice model. This provides a signature of our theoretical
skyrmion superfluidy that can be detected in a possible implementation of the
lattice model in a real quantum system.