Prog. Theor. Phys. Vol. 122 No. 4 (2009) pp. 943-951
Induced Order in Nonequivalent Two-Leg Hubbard Ladder
Yukawa Institute for Theoretical Physics, Kyoto University,
Kyoto 606-8502, Japan
(Received March 4, 2009; Revised June 24, 2009)
Motivated by the presence of different orders in multilayered
superconductors, we examine a model consisting of nonequivalent two Hubbard
chains coupled by interchain hopping by using the density-matrix
renormalization group (DMRG) and a mean-field theory. As an example, we
consider a system with noninteracting chain without order and a Hubbard chain
with strong antiferromagnetic (AF) spin-density-wave correlation. We find that
the magnitude of the interchain hopping controls the strength of induced AF
correlation as well as that of original one. It is also found that the induced
AF correlation decreases with increasing the magnitude of the original
correlation. Implications to the multilayered system are discussed.
Subject Index :
DOI : 10.1143/PTP.122.943
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