Response to Greiter's Comment
Demler, Eugene · Zhang, Shou-Cheng · Meixner, Stefan · Hanke, Werner
Original · EN
Greiter claimed erroneously that the pi-excitation of the Hubbard model has an energy of the order of U. This mistake originates from a inconsistent treatment of the two particle Hartree energy and the Hartee correction to the chemical potential. In any self-consistent calculations, these two contributions cancel exactly, as shown by Kohn, Luttinger and Ward. We also show that his interpretation of the finite-size studies is inconsistent.
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