Compressibility of the Two-Dimensional Infinite- U Hubbard Model

Arti Tandon, Ziqiang Wang, and Gabriel Kotliar
Phys. Rev. Lett. 83, 2046 – Published 6 September 1999
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Abstract

We study the interactions between the coherent quasiparticles and the incoherent Mott-Hubbard excitations and their effects on the low-energy properties in the U= Hubbard model. Within the framework of a systematic large- N expansion, these effects first occur in the next-to-leading order in 1/N. We calculate the scattering phase shift and the free energy, and determine the quasiparticle weight Z, mass renormalization, and the compressibility. It is found that the compressibility is strongly renormalized and diverges at a critical doping δc=0.07±0.01. We discuss the nature of this zero-temperature phase transition and its connection to phase separation and superconductivity.

  • Received 16 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.2046

©1999 American Physical Society

Authors & Affiliations

Arti Tandon1,2, Ziqiang Wang1, and Gabriel Kotliar3

  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02167
  • 2Department of Physics, Boston University, Boston, Massachusetts 02215
  • 3Department of Physics, Rutgers University, Piscataway, New Jersey 08854

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Vol. 83, Iss. 10 — 6 September 1999

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