Superfluid State in the Periodic Anderson Model with Attractive Interactions

Koga, Akihisa; Werner, Philipp

doi:10.1143/jpsj.79.114401

Cited by 16 publications

(11 citation statements)

References 60 publications

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“…This allows us to discuss the stability of the s-wave SF state more quantitatively beyond the static BCS mean-field theory [36]. In fact, the DMFT method has successfully been applied to various strongly correlated fermion systems with SF or superconducting states [32,[37][38][39][40][41][42][43].…”

Section: Model and Methodsmentioning

confidence: 99%

Stability of the superfluid state in three-component fermionic optical lattice systems

2014

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Three-component fermionic optical lattice systems are investigated in dynamical mean-field theory for the Hubbard model. Solving the effective impurity model by means of continuous-time quantum Monte Carlo simulations in the Nambu formalism, we find that the s-wave superfluid state proposed recently is indeed stabilized in the repulsively interacting case and appears along a first-order phase boundary between metallic and paired Mott states in the paramagnetic system. The BCS-BEC (Bose-Einstein condensation) crossover in the three-component fermionic system is also addressed.

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Section: Model and Methodsmentioning

confidence: 99%

Stability of the superfluid state in three-component fermionic optical lattice systems

2014

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“…14) Here, to discuss low-temperature properties quantitatively, we use the CTQMC method. 21) This technique has recently been developed 21) and has successfully been applied to general classes of models such as the Hubbard model, [29][30][31] periodic Anderson model, 32,33) Kondo lattice model, 34) and HolsteinHubbard model. 35) Here, we use the hybridization-expansion version of the CTQMC method 29) extended to the Nambu formalism.…”

Section: Model and Methodsmentioning

confidence: 99%

Mott Transitions in the Hubbard Model with Spatially Modulated Interactions

2013

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We study two-component fermions in optical lattices with spatially alternating on-site interactions using dynamical mean-field theory. Calculating the quasi-particle weight, double occupancy, and order parameters for each sublattice, we discuss the low-temperature properties of the system. When both interactions are repulsive, the magnetically ordered state is realized at half-filling. In the attractive case, the superfluid state is, in general, realized with a particle number imbalance. On the other hand, when repulsive and attractive interactions are comparable in the half-filled system, the magnetically ordered and superfluid states are not realized, but the metal-insulator transition occurs. This transition is characterized by the Mott and pairing transitions discussed in the conventional repulsive and attractive Hubbard models. In the doped system, commensurability emerges owing to the repulsive interactions and the metalinsulator transition occurs down to quarter-filling.

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“…Notice that the ratio between hybridization and bandwidth, which depends on the overlap of different wave functions is sensitive to these external parameters. Consequently, theoretical phase diagrams [8][9][10][11][12][13][14] obtained as a function of this ratio have a direct resemblance to those obtained experimentally when pressure or doping is varied [5][6][7][15][16][17] . It turns out that in realistic cases, the parity of the hybridization is very important.…”

Section: Introductionmentioning

confidence: 99%

Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

et al. 2019

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In this work we study a two-band model of a superconductor in a square lattice. One band is narrow in energy and includes local Coulomb correlations between its quasi-particles. Pairing occurs in this band due to nearest neighbor attractive interactions. Extended s-wave, as well as d-wave symmetries of the superconducting order parameter are considered. The correlated electrons hybridize with those in another, wide conduction band through a k-dependent mixing, with even or odd parity depending on the nature of the orbitals. The many-body problem is treated within a slave-boson approach that has proved adequate to deal with the strong electronic correlations that are assumed here. Since applied pressure changes mostly the ratio between hybridization and bandwidths, we can use this ratio as a control parameter to obtain the phase diagrams of the model. We find that for a wide range of parameters, the critical temperature increases as a function of hybridization (pressure), with a region of first-order transitions. When frustration is introduced it gives rise to a stable superconducting phase. We find that superconductivity can be suppressed for specific values of band-filling due to the Coulomb repulsion. We show how pressure, composition and strength of correlations affect the superconductivity for different symmetries of the order parameter and the hybridization. arXiv:1904.04945v1 [cond-mat.supr-con]

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Superfluid State in the Periodic Anderson Model with Attractive Interactions

Cited by 16 publications

References 60 publications

Stability of the superfluid state in three-component fermionic optical lattice systems

Stability of the superfluid state in three-component fermionic optical lattice systems

Mott Transitions in the Hubbard Model with Spatially Modulated Interactions

Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

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