Magnetization, d-wave superconductivity, and non-Fermi-liquid behavior in a crossover from dispersive to flat bands

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2019-09-18

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Department of Applied Physics

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en

Pages

11

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Physical Review B, Volume 100, issue 12, pp. 1-11

Abstract

We explore the effect of inhomogeneity on electronic properties of the two-dimensional Hubbard model on a square lattice using dynamical mean-field theory (DMFT). The inhomogeneity is introduced via modulated lattice hopping such that in the extreme inhomogeneous limit the resulting geometry is a Lieb lattice, which exhibits a flat-band dispersion. The crossover can be observed in the uniform sublattice magnetization which is zero in the homogeneous case and increases with the inhomogeneity. Studying the spatially resolved frequency-dependent local self-energy, we find a crossover from Fermi-liquid to non-Fermi-liquid behavior happening at a moderate value of the inhomogeneity. This emergence of a non-Fermi liquid is concomitant of a quasiflat band. For finite doping the system with small inhomogeneity displays d-wave superconductivity coexisting with incommensurate spin-density order, inferred from the presence of oscillatory DMFT solutions. The d-wave superconductivity gets suppressed for moderate to large inhomogeneity for any finite doping while the incommensurate spin-density order still exists.

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| openaire: EC/H2020/771891/EU//QSIMCORR

Keywords

HIGH-TEMPERATURE SUPERCONDUCTIVITY, MEAN-FIELD THEORY, HUBBARD-MODEL, FERROMAGNETISM, INSULATOR, SYSTEMS, PHYSICS, CHARGE, PHASE, ORDER

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DOI

10.1103/PhysRevB.100.125141

Citation

Kumar, P, Torma, P & Vanhala, T 2019, ' Magnetization, d-wave superconductivity, and non-Fermi-liquid behavior in a crossover from dispersive to flat bands ', Physical Review B, vol. 100, no. 12, 125141, pp. 1-11 . https://doi.org/10.1103/PhysRevB.100.125141

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https://urn.fi/URN:NBN:fi:aalto-201911076144

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[article-cris] Perustieteiden korkeakoulu / SCI