Quantum Phase Transitions in 2D--dimensional paramagnetic half--filled Hubbard model

2024/08/22 by N. I. Chashchin, Chashchin, N. I.
Physics and Astronomy · #45F15 #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #G.1 #Mathematical Physics (math-ph) #Physics of Superconductivity and Magnetism #Strong Light-Matter Interactions #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2408.12284

openalex publication_date 2024/08/22 · openalex created_date 2024/12/16 · openalex updated_date 2026/07/28

Abstract

We investigate the quantum phase transitions in strongly correlated electronic systems at T=0⁰K by the example of the 2D Hubbard model. The model for numerical calculations were formalized in terms of the integral equations previously obtained for the half--filled paramagnetic Hubbard model by means of the variational derivatives technique and subsequent Legendre transformation. For principal results we submit in series the momentum distribution functions n(k) which display distinct attributes for the incipient regimes: the pure doublon phase, the metal phase, Weyl semimetal phase, and Weyl excitonic insulator phase at the sequential increasing the onsite Coulomb interaction U.

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