Cuprate superconductors and Hubbard model. Functional RG for fermions. Computation of order parameters. Superconductivity versus magnetism. Functional
superconductivity in the Hubbard Model Andre LeClair Cornell University CBPF & UFF Rio de Janeiro Setembro 2010
Dynamic Hubbard models Dynamic Hubbard models are extensions of the conventional Hubbard model that describe essential physics of correlated electrons not described by the conventional Hubbard model: namely, that not only the energy changes when an atomic orbital is doubly occupied, but the wavefunction also does! Emergence of superconductivity in doped multiorbital Hubbard chains Niravkumar D. Patel1, Nitin Kaushal 2,3, Alberto Nocera2,4, Gonzalo Alvarez5 and Elbio Dagotto We introduce a variational state for one-dimensional two-orbital Hubbard models that intuitively explains the recent computational discovery of pairing in these systems when hole doped. Abstract Using a variational Monte Carlo method, we discuss the interplay between antiferromagnetism (AF) and superconductivity (SC) in a Hubbard model on a square lattice with a diagonal transfer t ′ . We simultaneously introduce the following improvements into the trial function: (1) coexistence of AF and d-wave singlet gaps that allows a continuous description of their interplay, (2) band Harvard University Antiferromagnetism and Superconductivity in the Hubbard model Spectral functions Order parameters Doping dependence of the superconducting gap Hubbard-model results and the fitwo-energy-gap scenariofl Explanation by spin-uctuations Conclusions OCompeting orders, spectral functions, and the superconducting gap in the Hubbard model Œ p.2/16 Abstract. In this paper a pairing mechanism caused by the kinematical interaction in the Hubbard model is considered. On the basis of equations of motion for two-time Green functions with anomalous pairings taken into account, equations are derived for the superconducting gap of an extended S-type and T{sub c}.
Modeling high-temperature superconductivity (HTS) remains extremely challenging. Many The superconducting instabilities of the doped repulsive 2D Hubbard model are studied in the inter-mediate to strong coupling regime with the help of the dynamical cluster approximation. To solve the effective cluster problem we employ an extended noncrossing approximation, which allows for a transi-tion to the broken symmetry state. Slave boson mean-field studies of the ground state of the Hubbard model with correlated hopping were performed.
The Hubbard model is defined with attractive interactions. Lattice phonons do not play a role. •What is the pseudogap? Is it a distinct phenomenon from superconductivity?
In this paper a pairing mechanism caused by the kinematical interaction in the Hubbard model is considered. On the basis of equations of motion for two-time Green functions with anomalous pairings taken into account, equations are derived for the superconducting gap of an … From the early stages of the study of high-temperature superconductivity, the single-band two-dimensional (2D) Hubbard model was argued to be the paradigmatic model for the problem [ ] [ ] .
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May 30, 2019 Using cellular dynamical mean-field theory for the Hubbard model, we revisit the question of the coexistence and competition of these phases in 2019年9月27日 The Hubbard model is widely believed to contain the essential ingredients of high-temperature superconductivity.
The Hubbard model, named after John Hubbard, is a simple model of interacting particles in a lattice, with only two terms in the Hamiltonian: a kinetic term allowing for tunneling of particles between sites of the lattice and a potential term consisting of an on-site interaction. The particles can either be fermions, as in Hubbard
Superconductivity in the doped bilayer Hubbard model. We study by the Gutzwiller approximation the melting of the valence-bond crystal phase of a bilayer Hubbard model at sufficiently large interlayer hopping.
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Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity · Terms of use.
Der Kampf des Atheismus gegen das Christentum in der DDR - Modell einer Svenska Handelsbanken and a proven model for post-crash banking. With a LYNTON, E. A., Superconductivity.
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We study the superconducting pairing correlations in the ground state of the doped Hubbard model -- in its original form without hopping beyond nearest neighbor or other perturbing parameters -- in two dimensions at intermediate to strong coupling and near optimal doping. The nature of such correlations has been a central question ever since the discovery of cuprate high-temperature
Anisotropic superconductivity of Unconventional superconductivity in generalized Hubbard model: role of electron hole symmetry breaking terms Marcin M Wysokiski and Jan Kaczmarczyk-Antiferromagnetism, charge density wave, and d-wave superconductivity in the extended t-J-U model: role of intersite Coulomb interaction and a critical overview of renormalized mean field theory Harvard University 2019-01-30 Abstract Using a variational Monte Carlo method, we discuss the interplay between antiferromagnetism (AF) and superconductivity (SC) in a Hubbard model on a square lattice with a diagonal transfer t ′ . We simultaneously introduce the following improvements into the trial function: (1) coexistence of AF and d-wave singlet gaps that allows a continuous description of their interplay, (2) band 1999-06-01 2018-06-05 · Superconductivity in the Hubbard model and its interplay with charge stripes and next-nearest hopping t' Hong-Chen Jiang, Thomas P. Devereaux We report a large-scale density-matrix renormalization group study of the lightly doped Hubbard model on 4-leg cylinders at hole doping concentration. while keeping U=tarbitrary. The result is that the Hubbard model is a superconductor [5], but the symmetry of the pairing state is not d x2 2y.
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In particular, the hole superconductivity proposed by J. Hirsch [4], based on a generalized Hubbard model that includes nearest neighbor hopping (t) and the so-called nearestneighbor correlated
On the other hand, compelling experimental evidence for an EPI has arrived from isotope effects,18 high-resolution Superconductivity.