Niravkumar D. Patel

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

The recent discovery of superconductivity under high pressure in the ladder compound BaFe

Signatures of Pairing in the Magnetic Excitation Spectrum of Strongly Correlated two-leg Ladders

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Magnetic excitation spectra of strongly correlated quasi-one-dimensional systems: Heisenberg versus Hubbard-like behavior

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Magnetic properties and pairing tendencies of the iron-based superconducting ladder BaFe2S3: Combined ab initio and density matrix renormalization group study

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Orbital selective directional conductor in the two-orbital Hubbard model

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

Non-Fermi Liquid Behavior and Continuously Tunable Resistivity Exponents in the Anderson-Hubbard Model at Finite Temperature

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Diverging nematic susceptibility, physical meaning of T * scale, and pseudogap in the spin fermion model for the pnictides

repulsion and robust Hund coupling

Testing the Monte Carlo–mean field approximation in the one-band Hubbard model

J_H/U=0.25

Orbital and Charge Excitations as Fingerprints of an Orbital-Selective Mott Phase in the Block Magnetic State of BaFe

. Binding does not occur neither in weak coupling nor 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. The Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.

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Magnetic interactions are widely believed to play a crucial role in the microscopic mechanism leading to high critical temperature superconductivity. It is therefore important to study the signatures of pairing in the magnetic excitation spectrum of simple models known to show unconventional superconducting tendencies. Using the Density Matrix Renormalization Group technique, we calculate the dynamical spin structure factor