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arXiv 1106.1685cond-mat.supr-conphysics.atom-ph
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二维六角Fulde-Ferrell-Larkin-Ovchinnikov相熔融的常规超流体和荷六超流体

Conventional and charge six superfluids from melting hexagonal Fulde-Ferrell-Larkin-Ovchinnikov phases in two dimensions

D. F. Agterberg, M Geracie, H. Tsunetsugu

摘要:

我们考虑二维Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)和对密度波(PDW)相的缺陷介导的熔化。检查平均场基态中的FFLO/PDW超流体序参量的空间振荡表现出六方晶格对称性,我们发现,热熔化导致各种新的阶段。我们发现,一个空间均匀的电荷六超流体可以产生熔化的六角涡旋-反涡旋晶格FFLO/PDW相。荷六超流体具有对应于六个费米子的束缚态的序参量。我们进一步发现,一个六角形的无涡FFLO/PDW相可以熔化,产生一个传统的(电荷2)均匀的超流体。一个关键的作用是发挥拓扑缺陷相结合的分数涡的超流秩序和分数位错的晶格顺序。

英文摘要:

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 six superfluid can arise from melting a hexagonal vortex-anitvortex lattice FFLO/PDW phase. The charge six 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 two) 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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