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Title: Pairing tendencies in a two-orbital Hubbard model in one dimension

Abstract

The recent discovery of superconductivity under high pressure in the ladder compound BaFe2S3 has opened a new field of research in iron-based superconductors with focus on quasi-one-dimensional geometries. In this publication, using the density matrix renormalization group technique, we study a two-orbital Hubbard model defined in one-dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard U repulsion and robust Hund coupling JH / U = 0.25. Binding does not occur either in weak coupling or at very strong coupling. The pair-pair correlations that are dominant near half-filling, or of similar strength as the charge and spin correlation channels, involve hole-pair operators that are spin singlets, use nearest-neighbor sites, and employ different orbitals for each hole. As a result, the Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.

Authors:
 [1];  [1]; ORCiD logo [2];  [1];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1399230
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 96; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Patel, Niravkumar D., Nocera, Adriana, Alvarez, Gonzalo, Moreo, A., and Dagotto, Elbio R. Pairing tendencies in a two-orbital Hubbard model in one dimension. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.024520.
Patel, Niravkumar D., Nocera, Adriana, Alvarez, Gonzalo, Moreo, A., & Dagotto, Elbio R. Pairing tendencies in a two-orbital Hubbard model in one dimension. United States. doi:10.1103/PhysRevB.96.024520.
Patel, Niravkumar D., Nocera, Adriana, Alvarez, Gonzalo, Moreo, A., and Dagotto, Elbio R. Mon . "Pairing tendencies in a two-orbital Hubbard model in one dimension". United States. doi:10.1103/PhysRevB.96.024520.
@article{osti_1399230,
title = {Pairing tendencies in a two-orbital Hubbard model in one dimension},
author = {Patel, Niravkumar D. and Nocera, Adriana and Alvarez, Gonzalo and Moreo, A. and Dagotto, Elbio R.},
abstractNote = {The recent discovery of superconductivity under high pressure in the ladder compound BaFe2S3 has opened a new field of research in iron-based superconductors with focus on quasi-one-dimensional geometries. In this publication, using the density matrix renormalization group technique, we study a two-orbital Hubbard model defined in one-dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard U repulsion and robust Hund coupling JH / U = 0.25. Binding does not occur either in weak coupling or at very strong coupling. The pair-pair correlations that are dominant near half-filling, or of similar strength as the charge and spin correlation channels, involve hole-pair operators that are spin singlets, use nearest-neighbor sites, and employ different orbitals for each hole. As a result, the Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.},
doi = {10.1103/PhysRevB.96.024520},
journal = {Physical Review B},
number = 2,
volume = 96,
place = {United States},
year = {Mon Jul 31 00:00:00 EDT 2017},
month = {Mon Jul 31 00:00:00 EDT 2017}
}