Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-04
Phys. Rev. B 78, 155128 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures
Scientific paper
10.1103/PhysRevB.78.155128
The variational cluster approach (VCA) based on the self-energy functional theory is applied to the two-dimensional symmetric periodic Anderson model at half filling. We calculate a variety of physical quantities including the staggered moments and single-particle spectra at zero temperature to show that the symmetry breaking due to antiferromagnetic ordering occurs in the strong coupling region, whereas in the weak coupling region, the Kondo insulating state without symmetry breaking is realized. The critical interaction strength is estimated. We thus demonstrate that the phase transition due to competition between antiferromagnetism and Kondo screening in the model can be described quantitatively by VCA.
Horiuchi Shunsaku
Kudo Seishi
Ohta Yasuhiro
Shirakawa Tatsuya
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