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

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 investigati...

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Autores principales:	Tsung-Han Lee, Nicola Lanatà, Minjae Kim, Gabriel Kotliar
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/3913d915751441d6a631898459952862
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spelling	oai:doaj.org-article:3913d915751441d6a6318984599528622021-11-29T18:10:15ZEfficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity10.1103/PhysRevX.11.0410402160-3308https://doaj.org/article/3913d915751441d6a6318984599528622021-11-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.041040http://doi.org/10.1103/PhysRevX.11.041040https://doaj.org/toc/2160-3308We 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 particle-particle 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.Tsung-Han LeeNicola LanatàMinjae KimGabriel KotliarAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 4, p 041040 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Tsung-Han Lee Nicola Lanatà Minjae Kim Gabriel Kotliar Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
description	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 particle-particle 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.
format	article
author	Tsung-Han Lee Nicola Lanatà Minjae Kim Gabriel Kotliar
author_facet	Tsung-Han Lee Nicola Lanatà Minjae Kim Gabriel Kotliar
author_sort	Tsung-Han Lee
title	Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
title_short	Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
title_full	Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
title_fullStr	Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
title_full_unstemmed	Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity
title_sort	efficient slave-boson approach for multiorbital two-particle response functions and superconductivity
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/3913d915751441d6a631898459952862
work_keys_str_mv	AT tsunghanlee efficientslavebosonapproachformultiorbitaltwoparticleresponsefunctionsandsuperconductivity AT nicolalanata efficientslavebosonapproachformultiorbitaltwoparticleresponsefunctionsandsuperconductivity AT minjaekim efficientslavebosonapproachformultiorbitaltwoparticleresponsefunctionsandsuperconductivity AT gabrielkotliar efficientslavebosonapproachformultiorbitaltwoparticleresponsefunctionsandsuperconductivity
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Efficient Slave-Boson Approach for Multiorbital Two-Particle Response Functions and Superconductivity

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