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

Okanami, Yuki; Takemori, Nayuta; Koga, Akihisa

doi:10.1103/physreva.89.053622

Cited by 12 publications

(20 citation statements)

References 57 publications

(84 reference statements)

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“…A similar behavior has been found in the three-component Hubbard model at half-filling [33]. In this case, the SC state appears along the first-order phase boundary between the metallic and PM states in the paramagnetic phase.…”

Section: Resultssupporting

confidence: 54%

“…On the other hand, concerning the critical end point (CEP), there is a difference between these two systems. In the three component systems, the CEP for the SC state is located near the CEP for the Mott transitions at low temperatures [33]. On the other hand, in our model, the conventional Mott state is adiabatically connected to the PM state through the crossover.…”

Section: Resultsmentioning

confidence: 92%

“…The DMFT treatment allows us to discuss the stability of the s-wave SC state more quantitatively than the static BCS mean-field theory [26]. In fact, the DMFT method has been successfully applied to various strongly correlated fermion systems with SC and superfluid states [27][28][29][30][31][32][33][34].…”

Section: Model and Methodsmentioning

confidence: 99%

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Superconductivity in the two-band Hubbard model

Koga

Werner

2015

Phys. Rev. B

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We study the two-band Hubbard model in infinite dimensions by solving the dynamical mean-field equations with a strong coupling continuous-time quantum Monte Carlo method and show that an s-wave superconducting state can be stabilized in the repulsively interacting case. We discuss how this superconducting state competes with the metallic and paired Mott states. The effects of the Hund coupling and crystalline electric field are also addressed.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 92%

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Superconductivity in the two-band Hubbard model

Koga

Werner

2015

Phys. Rev. B

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“…We also find that the low energy fix point has a higher symmetry with respect to interaction between modes that the original model, signalling a dynamically emergent symmetry. This phenomenon was previously observed in the context of three leg ladders [61][62][63][64][65][66][67][68][69][70][71][72]. In our case, the massive phases are ground states of a Hamiltonian that is obtained by marginal deformations of an emergent SU(3) symmetry, which is not present in the UV, but that manifest itself in the IR.…”

Section: Discussion and Outlooksupporting

confidence: 77%

Interplay between intrinsic and emergent topological protection on interacting helical modes

2019

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The interplay between topology and interactions on the edge of a two dimensional topological insulator with time reversal symmetry is studied. We consider a simple non-interacting system of three helical channels with an inherent Z2 topological protection, and hence a zero-temperature conductance of G = e 2 /h. We show that when interactions are added to the model, the ground state exhibits two different phases as function of the interaction parameters. One of these phases is a trivial insulator at zero temperature, as the symmetry protecting the non-interacting topological phase is spontaneously broken. In this phase there is zero conductance (G = 0) at zerotemperature. The other phase displays enhanced topological properties, with a topologically protected zero-temperature conductance of G = 3e 2 /h and an emergent Z3 symmetry not present in the lattice model. The neutral sector in this phase is described by a massive version of Z3 parafermions. This state is an example of a dynamically enhanced symmetry protected topological state.

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“…The effective attraction for Cooper pairs can be understood from the imbalance of the Coulomb interactions [14,[33][34][35]. To see this, let us consider the situation with two electrons on one lattice site.…”

mentioning

confidence: 99%

Superconductivity from Emerging Magnetic Moments

2015

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Multiorbital Hubbard models are shown to exhibit a spatially isotropic spin-triplet superconducting phase, where equal-spin electrons in different local orbitals are paired. This superconducting state is stabilized in the spin-freezing crossover regime, where local moments emerge in the metal phase, and the pairing is substantially assisted by spin anisotropy. The phase diagram features a superconducting dome below a non-Fermi-liquid metallic region and next to a magnetically ordered phase. We suggest that this type of fluctuating-moment-induced superconductivity, which is not originating from fluctuations near a quantum critical point, may be realized in spin-triplet superconductors such as strontium ruthenates and uranium compounds.

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

Cited by 12 publications

References 57 publications

Superconductivity in the two-band Hubbard model

Superconductivity in the two-band Hubbard model

Interplay between intrinsic and emergent topological protection on interacting helical modes

Superconductivity from Emerging Magnetic Moments

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