Abstract:
The finite-temperature phase diagram of the Hubbard model in d=3 is obtained from renormalization-group analysis. It exhibits, around half filling, an antiferromagnetic phase and, between 30%-40% electron or hole doping from half filling, a new τ phase in which the electron hopping strength t asymptotically becomes infinite under repeated rescalings. Next to the τ phase, a first-order phase boundary with very narrow phase separation (less than 2% jump in electron density) occurs. At temperatures above the τ phase, an incommensurate spin modulation phase is indicated. In d=2, we find that the Hubbard model has no phase transition at finite temperature.
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Received 29 May 2000
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Migliorini, G., Nihat Berker, A. Finite-temperature phase diagram of the Hubbard model. Eur. Phys. J. B 17, 3–6 (2000). https://doi.org/10.1007/s100510070153
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DOI: https://doi.org/10.1007/s100510070153