Finite-temperature phase diagram of the Hubbard model


Migliorini G., Berker A.

EUROPEAN PHYSICAL JOURNAL B, cilt.17, ss.3-6, 2000 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 17 Konu: 1
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1007/s100510070153
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
  • Sayfa Sayıları: ss.3-6

Özet

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 tau phase in which the electron hopping strength t asymptotically becomes infinite under repeated rescalings. Next to the tau phase, a first-order phase boundary with very narrow phase separation (less than 2% jump in electron density) occurs. At temperatures above the tau phase, an incommensurate spin modulation phase is indicated. In d = 2, we find that the Hubbard model has no phase transition at finite temperature.