• Corpus ID: 238531634

Fermi surface expansion above critical temperature in a Hund ferromagnet

@inproceedings{Nomura2021FermiSE,
  title={Fermi surface expansion above critical temperature in a Hund ferromagnet},
  author={Yusuke Nomura and Shiro Sakai and Ryotaro Arita},
  year={2021}
}
Using a cluster extension of the dynamical mean-field theory, we show that strongly correlated metals subject to Hund’s physics exhibit significant electronic structure modulations above magnetic transition temperatures. In particular, in a ferromagnet having a large local moment due to Hund’s coupling (Hund’s ferromagnet), the Fermi surface expands even above the Curie temperature (Tc) as if the spin polarization occurred. Behind this phenomenon, effective “Hund’s physics” works in momentum… 

Figures from this paper

References

SHOWING 1-10 OF 38 REFERENCES
Nonlocal correlations induced by Hund's coupling: A cluster DMFT study
We study spatial correlation effects in multiorbital systems, especially in a paramagnetic metallic state subject to Hund's coupling. We apply a cluster extension of the dynamical mean-field theory
Dynamical Mean-Field Theory Plus Numerical Renormalization-Group Study of Spin-Orbital Separation in a Three-Band Hund Metal.
We show that the numerical renormalization group is a viable multi-band impurity solver for dynamical mean-field theory (DMFT), offering unprecedented real-frequency spectral resolution at
Spin freezing transition and non-Fermi-liquid self-energy in a three-orbital model.
A single-site dynamical mean-field study of a three band model with the rotationally invariant interactions appropriate to the t_(2g) levels of a transition metal oxide reveals a quantum phase
Strong Correlations from Hund’s Coupling
Strong electronic correlations are often associated with the proximity of a Mott-insulating state. In recent years however, it has become increasingly clear that the Hund’s rule coupling
Microscopic conditions favoring itinerant ferromagnetism: Hund's rule coupling and orbital degeneracy
Abstract:The importance of Hund's rule coupling for the stabilization of itinerant ferromagnetism is investigated within a two-band Hubbard model. The magnetic phase diagram is calculated by
Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions
We review the dynamical mean-field theory of strongly correlated electron systems which is based on a mapping of lattice models onto quantum impurity models subject to a self-consistency condition.
Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study.
TLDR
Comparison of three-dimensional lattice structures in the single- and multiorbital Hubbard models with the dynamical mean-field theory with an improved quantum Monte Carlo algorithm indicates that both the lattice structure and the d-orbital degeneracy are essential for the ferromagnetism in the parameter region representing a transition metal.
FERMI SURFACE AND SOME SIMPLE EQUILIBRIUM PROPERTIES OF A SYSTEM OF INTERACTING FERMIONS
It was shown that certain analytical properties of the propagators of many-ferraion systems led rigorously to the existence of sharp discontinuities of the momentum distribution at absolute zero.
Fluctuation Diagnostics of the Electron Self-Energy: Origin of the Pseudogap Physics.
TLDR
It is demonstrated how to identify which physical processes dominate the low-energy spectral functions of correlated electron systems through an analysis of the equation of motion for the electron self-energy in its charge, spin, and particle-particle representations.
Hidden-fermion representation of self-energy in pseudogap and superconducting states of the two-dimensional Hubbard model
We study the frequency-dependent structure of electronic self-energy in the pseudogap and superconducting states of the two-dimensional Hubbard model. We present the self-energy calculated with the
...
1
2
3
4
...