We propose a model for realizing exotic paired states in cold Fermi gases by using a spin-dependent optical lattice to engineer mismatched Fermi surfaces for each hyperfine species. The BCS phase diagram shows a stable paired superfluid state with coexisting pockets of momentum space with gapless unpaired carriers, similar to the Sarma state in polarized mixtures, but in our case the system is unpolarized. We propose the possible existence of an exotic "Cooper-pair Bose-metal" phase, which has a gap for single fermion excitations but gapless and uncondensed "Cooper-pair" excitations residing on a "Bose surface" in momentum space.
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| http://dx.doi.org/10.1103/PhysRevLett.103.025303 | DOI Listing |
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Article Synopsis
- This letter proposes a new method for identifying confining dark sectors at the LHC through the detection of semi-visible jets resulting from collisions involving dark quarks from a hidden sector.
- It explains how these semi-visible jets can produce non-isolated photons and stable/unstable dark bound states, which may not align with current search strategies at the LHC.
- The authors suggest using a deep neural network to differentiate these exotic jets from background noise by analyzing their unique substructure, allowing for potential discoveries of heavy bosons with masses up to 5 TeV using data from the LHC's Run 2.
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