Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity

Lee, Tsung-HanRutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA. (författare)

Nordita SUQC 20211220
We develop an efficient approach for computing two-particle response functions and interaction vertices for multiorbital strongly correlated systems based on the rotationally invariant slave-boson framework. The method is applied to the degenerate three-orbital Hubbard-Kanamori model for investigating the origin of the s-wave orbital antisymmetric spin-triplet superconductivity in Hund's metal regime, previously found in the dynamical mean-field theory studies. By computing the pairing interaction considering the particleparticle and the particle-hole scattering channels, we identify the mechanism leading to the pairing instability around Hund's metal crossover arises from the particle-particle channel, which contains the local electron pair fluctuation between different particle-number sectors of the atomic Hilbert space. On the other hand, the particle-hole spin fluctuations induce the s-wave pairing instability before entering Hund's regime. Our approach paves the way for investigating the pairing mechanism in realistic correlated materials.

Lanata, NicolaStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Aarhus University, Denmark,Nordita SU(Swepub:su)nila2849 (författare)
Kim, MinjaeRutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA.;Pohang Univ Sci & Technol POSTECH, Dept Chem, Pohang 37673, South Korea. (författare)
Kotliar, GabrielRutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA.;Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA. (författare)
Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA.Nordiska institutet för teoretisk fysik (Nordita) (creator_code:org_t)

Av författaren/redakt...: Lee, Tsung-Han; Lanata, Nicola; Kim, Minjae; Kotliar, Gabriel

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