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Title: Compressibility of the Two-Dimensional Infinite-U Hubbard Model

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={infinity} 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 {delta}{sub c}=0.07{plus_minus}0.01 . We discuss the nature of this zero-temperature phase transition and its connection to phase separation and superconductivity. {copyright} {ital 1999} {ital The American Physical Society}

Authors:
;  [1];  [2];  [3]
  1. Department of Physics, Boston College, Chestnut Hill, Massachusetts 02167 (United States)
  2. Department of Physics, Boston University, Boston, Massachusetts 02215 (United States)
  3. Department of Physics, Rutgers University, Piscataway, New Jersey 08854 (United States)
Publication Date:
OSTI Identifier:
686472
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 83; Journal Issue: 10; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; FERMI GAS; HUBBARD MODEL; HIGH-TC SUPERCONDUCTORS; QUASI PARTICLES; MEAN-FIELD THEORY; COMPRESSIBILITY; HILBERT SPACE; TWO-DIMENSIONAL CALCULATIONS; DOPED MATERIALS; PHASE TRANSFORMATIONS

Citation Formats

Tandon, A., Wang, Z., Tandon, A., and Kotliar, G. Compressibility of the Two-Dimensional Infinite-U Hubbard Model. United States: N. p., 1999. Web. doi:10.1103/PhysRevLett.83.2046.
Tandon, A., Wang, Z., Tandon, A., & Kotliar, G. Compressibility of the Two-Dimensional Infinite-U Hubbard Model. United States. doi:10.1103/PhysRevLett.83.2046.
Tandon, A., Wang, Z., Tandon, A., and Kotliar, G. Wed . "Compressibility of the Two-Dimensional Infinite-U Hubbard Model". United States. doi:10.1103/PhysRevLett.83.2046.
@article{osti_686472,
title = {Compressibility of the Two-Dimensional Infinite-U Hubbard Model},
author = {Tandon, A. and Wang, Z. and Tandon, A. and Kotliar, G.},
abstractNote = {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={infinity} 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 {delta}{sub c}=0.07{plus_minus}0.01 . We discuss the nature of this zero-temperature phase transition and its connection to phase separation and superconductivity. {copyright} {ital 1999} {ital The American Physical Society}},
doi = {10.1103/PhysRevLett.83.2046},
journal = {Physical Review Letters},
number = 10,
volume = 83,
place = {United States},
year = {1999},
month = {9}
}