FLEX Study on the compressibility of the two-dimensional Hubbard model

Kunihisa Morita; Hideaki Maebashi; Kazumasa Miyake

doi:10.1016/S0921-4526(01)01532-0

FLEX Study on the compressibility of the two-dimensional Hubbard model

Kunihisa Morita, Hideaki Maebashi, Kazumasa Miyake

Division for Humanities and Social Sciences

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

We investigate, on the basis of the fluctuation exchange (FLEX) approximation, a hole-number dependence of the compressibility in the two-dimensional t-t′-U Hubbard model. We choose a value of U near the critical Coulomb interaction of the antiferromagnetic transition, where the shape of the renormalized Fermi surface is deformed showing the tendency of nesting. It is found that, near half-filling, the charge susceptibility χ_c = ∂n/∂μ is larger about three times than the value given by the renormalized RPA, χ_c = Π₀/(1+UΠ₀), where Π₀ is the polarization function calculated by FLEX approximation.

Original language	English
Pages (from-to)	547-549
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	312-313
DOIs	https://doi.org/10.1016/S0921-4526(01)01532-0
Publication status	Published - Mar 1 2002
Event	International Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States Duration: Aug 6 2002 → Aug 6 2002

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "FLEX Study on the compressibility of the two-dimensional Hubbard model",

abstract = "We investigate, on the basis of the fluctuation exchange (FLEX) approximation, a hole-number dependence of the compressibility in the two-dimensional t-t′-U Hubbard model. We choose a value of U near the critical Coulomb interaction of the antiferromagnetic transition, where the shape of the renormalized Fermi surface is deformed showing the tendency of nesting. It is found that, near half-filling, the charge susceptibility χc = ∂n/∂μ is larger about three times than the value given by the renormalized RPA, χc = Π0/(1+UΠ0), where Π0 is the polarization function calculated by FLEX approximation.",

author = "Kunihisa Morita and Hideaki Maebashi and Kazumasa Miyake",

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T1 - FLEX Study on the compressibility of the two-dimensional Hubbard model

AU - Morita, Kunihisa

AU - Maebashi, Hideaki

AU - Miyake, Kazumasa

PY - 2002/3/1

Y1 - 2002/3/1

N2 - We investigate, on the basis of the fluctuation exchange (FLEX) approximation, a hole-number dependence of the compressibility in the two-dimensional t-t′-U Hubbard model. We choose a value of U near the critical Coulomb interaction of the antiferromagnetic transition, where the shape of the renormalized Fermi surface is deformed showing the tendency of nesting. It is found that, near half-filling, the charge susceptibility χc = ∂n/∂μ is larger about three times than the value given by the renormalized RPA, χc = Π0/(1+UΠ0), where Π0 is the polarization function calculated by FLEX approximation.

AB - We investigate, on the basis of the fluctuation exchange (FLEX) approximation, a hole-number dependence of the compressibility in the two-dimensional t-t′-U Hubbard model. We choose a value of U near the critical Coulomb interaction of the antiferromagnetic transition, where the shape of the renormalized Fermi surface is deformed showing the tendency of nesting. It is found that, near half-filling, the charge susceptibility χc = ∂n/∂μ is larger about three times than the value given by the renormalized RPA, χc = Π0/(1+UΠ0), where Π0 is the polarization function calculated by FLEX approximation.

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U2 - 10.1016/S0921-4526(01)01532-0

DO - 10.1016/S0921-4526(01)01532-0

M3 - Conference article

AN - SCOPUS:0036503776

VL - 312-313

SP - 547

EP - 549

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

T2 - International Conference on Strongly Correlated Electrons

Y2 - 6 August 2002 through 6 August 2002

ER -

FLEX Study on the compressibility of the two-dimensional Hubbard model

Abstract

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