Topological transitions of gapless paired states in mixed-geometry lattices

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2013-02-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
1-5
Series
PHYSICAL REVIEW LETTERS, Volume 110, issue 5
Abstract
We propose a mixed-geometry system of fermionic species selectively confined in lattices of different geometry. We investigate how such asymmetry can lead to exotic multiband fermion pairing in an example system of honeycomb and triangular lattices. A rich phase diagram of interband pairing with gapped and gapless excitations is found at zero temperature. We find that the two-band contribution of the honeycomb lattices to the paired state helps to stabilize the gapless phase with one or two Fermi surfaces. We also show that the Fermi surface topology further divides the gapless phase into subclasses between which the system undergoes density-driven Lifshitz transitions.
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Keywords
strongly correlated systems, superconductivity, ultracold atomic gases
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Citation
Kim , D-H , Lehikoinen , J S J & Törmä , P 2013 , ' Topological transitions of gapless paired states in mixed-geometry lattices ' , Physical Review Letters , vol. 110 , no. 5 , 055301 , pp. 1-5 . https://doi.org/10.1103/PhysRevLett.110.055301