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Seminário de Matéria Condensada: Interplay between charge density wave and superconducting order in multiband systems (Daniel Reyes, IME-RJ)

16 de novembro de 2023:14:00 - 17:00

In this work we study the interplay between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands has a net attractive interaction (Jd ) that is responsible for SC. The model includes on-site Coulomb repulsion between quasiparticles in different bands (Udc ) and the hybridization (V ) between them. We are interested in describing intermetallic systems with a d-band of moderatelycorrelated electrons, for which a mean-field approximation is adequate, coexisting with a large sp-band. For simplicity, all interactions and the hybridization V are considered site-independent. We obtain the eigenvalues of the Hamiltonian numerically and minimize the free energy density with respect to the relevant parameters to obtain the phase diagrams as function of Jd, Udc, V, band-filling (ntot), and the relative depth of the bands ed0. The model reproduces most of the experimental features of high dimensionality (D > 1) metals with competing CDW and SC states, including the existence of first – and second-order phase transitions in their phase diagrams. Our results also show that the CDW and SC orders compete, but depending on the parameters of the model these phases may coexist

[1] Nei Lopes, Daniel Reyes, Mucio A. Continentino, and Christopher Thomas, Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction, Phys. Rev. B 103, 195150 (2021).

[2] Nei Lopes, Daniel Reyes, Natanael C. Costa, Mucio A. Continentino, and Christopher Thomas, Incommensurate charge density wave in multiband intermetallic systems exhibiting competing orders, Phys. Rev. B 107, 205141 (2023).


16 de novembro de 2023
14:00 - 17:00
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