Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

Abstract

We present a dynamical mean-field study of dynamical susceptibilities in two-band Hubbard model. Varying the model parameters we analyze the two-particle excitations in the normal as well as in the ordered phase, an excitonic condensate. The two-particle DMFT spectra in the ordered phase reveal the gapless Goldstone modes arising from spontaneous breaking of continuous symmetries. We also observe gapped Higgs mode, characterized by vanishing of the gap at the phase boundary. Qualitative changes observed in the spin susceptibility can be used as an experimental probe to identify the excitonic condensation.

arXiv commentpublished version

References in corpus (41)

• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• A continuous-time solver for quantum impurity models
• The ALPS project release 2.0: Open source software for strongly correlated systems
• Signatures of exciton condensation in a transition metal dichalcogenide
• Amplitude / Higgs Modes in Condensed Matter Physics
• Unified Description of Nambu-Goldstone Bosons without Lorentz Invariance
• Excitonic Magnetism in Van Vleck-type d^4 Mott Insulators
• Orthogonal Polynomial Representation of Imaginary-Time Green's Functions
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• The Higgs Mode in Disordered Superconductors Close to a Quantum Phase Transition
• Higgs mode and its decay in a two dimensional antiferromagnet
• w2dynamics: Local one- and two-particle quantities from dynamical mean field theory
• Excitonic quasiparticles in a spin-orbit Mott insulator
• Quantum and classical criticality in a dimerized quantum antiferromagnet
• Chirality density wave of the 'hidden order' phase in URu${}_2$Si${}_2$
• Excitonic condensation in systems of strongly correlated electrons
• Updated Core Libraries of the ALPS Project
• Maximum entropy formalism for the analytic continuation of matrix-valued Green's functions
• Sparse modeling approach to analytical continuation of imaginary-time quantum Monte Carlo data
• The magnetic excitation spectra in BaFe${}_2$As${}_2$: a two-particle approach within DFT+DMFT
• Efficient treatment of two-particle vertices in dynamical mean-field theory
• Magnetic properties and spin waves of bilayer magnets in a uniform field
• Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
• Excitonic Instability at the Spin-State Transition in the Two-Band Hubbard Model
• Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint
• Excitonic condensation of strongly correlated electrons: the case of Pr${}_{0.5}$Ca${}_{0.5}$CoO${}_3$
• Continuous-time hybridization expansion quantum impurity solver for multi-orbital systems with complex hybridizations
• Roles of Hund's rule coupling in excitonic density-wave states
• Competition between excitonic charge and spin density waves: Influence of electron-phonon and Hund's rule couplings
• Conservation in two-particle self-consistent extensions of dynamical-mean-field-theory
• Magnetic field effects in a correlated electron system with spin-state degree of freedom - Implication of an excitonic insulator -
• Excitonic order at strong-coupling: pseudo-spins, doping, and ferromagnetism
• Phase diagram of exciton condensate in doped two-band Hubbard model
• Selective insulators and anomalous responses in correlated fermions with synthetic extra dimensions
• Excitonic dispersion of the intermediate-spin state in LaCoO${}_3$ revealed by resonant inelastic X-ray scattering
• Theory of Ferromagnetism in Doped Excitonic Condensates
• Thermodynamic consistency of the charge response in dynamical mean-field based approaches
• Low-energy excitation spectra in the excitonic phase of cobalt oxides
• Getting back to Na_xCoO_2: spectral and thermoelectric properties
• Spontaneous Spin Textures in Multiorbital Mott Systems
• Excitonic magnet in external field: complex order parameter and spin currents

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