TY - JOUR
T1 - Effect of impurity potentials on antiferromagnetism in two-dimensional Hubbard model
AU - Yokoyama, Hisatoshi
AU - Sato, Ryo
AU - Kobayashi, Kenji
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2017/7/26
Y1 - 2017/7/26
N2 - Recent numerical studies have shown that antiferromagnetism (AF) prevails widely near half filling in the two-dimensional Hubbard (t-t′-U) model, contrary to the experiments on cuprate superconductors. In cuprates, disorders owing to the dopants, which are usually disregarded in theory, are possibly intrinsic and considerable. Thus, as a first step, we consider the effects of point-type impurity potentials, which are randomly distributed on the lattice sites, on the stability of AF. It is found that a moderate impurity potential does not modify the stability of AF, but a sufficiently strong attractive potential V(V ≲ -U) appreciably weakens an antiferromagnetic state owing to an insufficient screening of V.
AB - Recent numerical studies have shown that antiferromagnetism (AF) prevails widely near half filling in the two-dimensional Hubbard (t-t′-U) model, contrary to the experiments on cuprate superconductors. In cuprates, disorders owing to the dopants, which are usually disregarded in theory, are possibly intrinsic and considerable. Thus, as a first step, we consider the effects of point-type impurity potentials, which are randomly distributed on the lattice sites, on the stability of AF. It is found that a moderate impurity potential does not modify the stability of AF, but a sufficiently strong attractive potential V(V ≲ -U) appreciably weakens an antiferromagnetic state owing to an insufficient screening of V.
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U2 - 10.1088/1742-6596/871/1/012032
DO - 10.1088/1742-6596/871/1/012032
M3 - Conference article
AN - SCOPUS:85027978367
VL - 871
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012032
T2 - 29th International Symposium on Superconductivity, ISS 2016
Y2 - 13 December 2016 through 15 December 2016
ER -