期刊
PHYSICAL REVIEW B
卷 84, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.014513
关键词
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资金
- NSF [DMR-0906655]
- MEXT of Japan [19052003]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906655] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [19052003, 19052007] Funding Source: KAKEN
We consider defect-mediated melting of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) and pair density wave (PDW) phases in two dimensions. Examining mean-field ground states in which the spatial oscillations of the FFLO/PDW superfluid order parameter exhibit hexagonal lattice symmetry, we find that thermal melting leads to a variety of novel phases. We find that a spatially homogeneous charge 6 superfluid can arise from melting a hexagonal vortex-antivortex lattice FFLO/PDW phase. The charge 6 superfluid has an order parameter corresponding to a bound state of six fermions. We further find that a hexagonal vortex-free FFLO/PDW phase can melt to yield a conventional (charge 2) homogeneous superfluid. A key role is played by topological defects that combine fractional vortices of the superfluid order and fractional dislocations of the lattice order.
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