Pair binding and enhancement of pairing correlations in asymmetric Hubbard ladders

Asymmetric two-leg Hubbard ladders with different on-site interactions \(U_y\) and hoppings \(t_y\) on each leg are investigated using the density matrix renormalization group method and exact diagonalizations. The pairing found in symmetric ladders is robust against the introduction of the leg asym...

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Bibliographic Details
Published in:arXiv.org 2022-12
Main Authors: Abdelwahab, Anas, Polat, Gökmen, Jeckelmann, Eric
Format: Article
Language:English
Subjects:
Asymmetry
Charge transfer
Insulators
Ladders
Mathematical analysis
Online Access:Get full text
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Summary:Asymmetric two-leg Hubbard ladders with different on-site interactions \(U_y\) and hoppings \(t_y\) on each leg are investigated using the density matrix renormalization group method and exact diagonalizations. The pairing found in symmetric ladders is robust against the introduction of the leg asymmetry. When studying pairing, one-band Hubbard ladder models are better described as one-dimensional correlated two-band models than as sublattices of higher dimensional systems. The asymmetric Hubbard ladder provides us with a simple model for studying pairing in the crossover regime between charge transfer and Mott insulators.
ISSN:2331-8422
DOI:10.48550/arxiv.2209.05192