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- W2091289416 abstract "We find and characterize the instabilities of the repulsive Hubbard chain in a magnetic field by studing all response functions at low frequency omega and arbitrary momentum. The instabilities occur at momenta which are simple combinations of the (U=0) sigma =uparrow ,downarrow Fermi points, pm k_{Fsigma}. For finite values of the on-site repulsion U the instabilities occur for single sigma electron adding or removing at momenta pm k_{Fsigma}, for transverse spin-density wave (SDW) at momenta pm 2k_F (where 2k_F=k_{Fuparrow}+k_{Fdownarrow}), and for charge-density wave (CDW) and SDW at momenta pm 2k_{Fuparrow} and pm 2k_{Fdownarrow}. While at zero magnetic field removing or adding single electrons is dominant, the presence of that field brings about a dominance for the transverse pm 2k_F SDW over all the remaining instabilities for a large domain of $U$ and density n values. We go beyond conformal-field theory and study divergences which occur at finite frequency in the one-electron Green function at half filling and in the transverse-spin response function in the fully-polarized ferromagnetic phase." @default.
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- W2091289416 date "1997-03-15" @default.
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- W2091289416 title "Instabilities of the Hubbard chain in a magnetic field" @default.
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- W2091289416 doi "https://doi.org/10.1103/physrevb.55.7565" @default.
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