TY - JOUR
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 -