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- W3100315308 abstract "We discuss the ground state and some excited states of the half-filled Hubbard model defined on an open chain with L sites, where only one of the boundary sites has a different value of chemical potential. We consider the case when the boundary site has a negative chemical potential -p and the Hubbard coupling U is positive. By an analytic method we show that when p is larger than the transfer integral some of the ground-state solutions of the Bethe ansatz equations become complex-valued. It follows that there is a ``surface phase transition'' at some critical value p_c; when p<p_c all the charge excitations have the gap for the half-filled band, while there exists a massless charge mode when p>p_c." @default.
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- W3100315308 date "1998-09-11" @default.
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- W3100315308 title "A gapless charge mode induced by the boundary states in the half-filled Hubbard open chain" @default.
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- W3100315308 doi "https://doi.org/10.1088/0305-4470/31/36/006" @default.
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