Fidelity Study of Superconductivity in Extended Hubbard Models

Abstract

The Hubbard model with local on-site repulsion is generally thought to possess a superconducting ground-state for appropriate parameters, but the effects of more realistic long-range Coulomb interactions have not been studied extensively. We study the influence of these interactions on superconductivity by including nearest and next-nearest neighbor extended Hubbard interactions in addition to the usual on-site terms. Utilizing numerical exact diagonalization, we analyze the signatures of superconductivity in the ground states through the fidelity metric of quantum information theory. We find that nearest and next-nearest neighbor interactions have thresholds above which they destabilize superconductivity regardless of whether they are attractive or repulsive, seemingly due to competing charge fluctuations.

5 pages, 3 figures

References in corpus (18)

• Fidelity, dynamic structure factor, and susceptibility in critical phenomena
• Quantum critical scaling of the geometric tensors
• Superconductivity in the repulsive Hubbard model: an asymptotically exact weak-coupling solution
• Ground-State Fidelity and Bipartite Entanglement in the Bose-Hubbard Model
• Strongly Correlated Superconductivity: a plaquette Dynamical mean field theory study
• Quantum phase transitions and quantum fidelity in free fermion graphs
• Fidelity and Quantum phase transition for the Heisenberg chain with the next-nearest-neighbor interaction
• Fidelity analysis of topological quantum phase transitions
• Bond order instabilities in a correlated two-dimensional metal
• Fidelity approach to the disordered quantum XY model
• The fidelity approach to the Hubbard model
• Fidelity in topological quantum phases of matter
• Non-Perturbative Treatment of Charge and Spin Fluctuations in the Two-Dimensional Extended Hubbard Model: Extended Two-Particle Self-Consistent Approach
• On the theory of superconductivity in the extended Hubbard model: Spin-fluctuation pairing
• Optimal T${}_c$ of cuprates: role of screening and reservoir layers
• Fidelity and superconductivity in two-dimensional t-J models
• Origin of charge density wave in the coupled spin ladders in Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$
• Effects of Strong Correlations and Disorder in d-Wave Superconductors

Cited by in corpus (7)

• Spin-Triplet Pairing Induced by Near-Neighbor Attraction in the Cuprate Chain
• Enhancing $d$-wave superconductivity with nearest-neighbor attraction of extended Hubbard model
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• CDMFT+HFD : an extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model
• Superconducting fluctuations and charge-4$e$ plaquette state at strong coupling
• Interfacial Strain Modulated Correlated Plasmons in La1.85Sr0.15CuO4 and Their Role in High-temperature Superconductivity
• Order by projection in single-band Hubbard model: a DMRG study