Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-06-28
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages, RevTex, uses epsf.sty and multicol.sty
Scientific paper
10.1143/JPSJ.67.1377
In order to shed light whether the `even-odd conjecture' (even numbers of legs will superconduct accompanied by a spin gap while odd ones do not) for correlated electrons in ladder systems, the pairing correlation is studied for the Hubbard model on a two- and three-leg ladders. We have employed both the weak-coupling renormalization group and the quantum Monte Carlo (QMC) method for strong interactions. For the two-leg Hubbard ladder, a systematic QMC (with a controlled level spacings) has detected an enhanced pairing correlation, which is consistent with the weak-coupling prediction. We also calculate the correlation functions in the three-leg Hubbard ladder and show that the weak-coupling study predicts the dominant superconductivity, which refutes the naive even-odd conjecture. A crucial point is a spin gap for only some of the multiple spin modes is enough to make the ladder superconduct with a pairing symmetry (d-like here) compatible with the gapped mode. A QMC study for the three-leg ladder endorses the enhanced pairing correlation.
Aoki Hideo
Kimura Takashi
Kuroki Kazuhiko
No associations
LandOfFree
Pairing correlation in the two- and three-leg Hubbard ladders --- Renormalization and quantum Monte Carlo studies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pairing correlation in the two- and three-leg Hubbard ladders --- Renormalization and quantum Monte Carlo studies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pairing correlation in the two- and three-leg Hubbard ladders --- Renormalization and quantum Monte Carlo studies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-128871