Two Quantum Liquids
1989 ◽
Vol 03
(12)
◽
pp. 2019-2047
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We describe a theory of the two dimensional Heisenberg-Hubbard model working in the spin and hole fermion representation based on the use of a singular gauge transformation on the spins. We are motivated by a new mean field theory for a system of strongly coupled fermions and bosons which is also described. In the latter case we obtain the bose condensed—fermi liquid phase; in the former we obtain equations governing generalized flux phases. We do not find superconducting solutions to these equations in the atomic limit, J=0. If solutions exist for finite J case then it is argued that an energy gap is present in that case.
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2018 ◽
Vol 51
(14)
◽
pp. 145302
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2017 ◽
Vol 31
(09)
◽
pp. 1750066
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