Excitonic condensation in systems of strongly correlated electrons

J Kuneš - Journal of Physics: Condensed Matter, 2015‏ - iopscience.iop.org
The idea of exciton condensation in solids was introduced in the 1960s with the analogy of
superconductivity in mind. While exciton supercurrents have been realised only in artificial …

Giant exciton Fano resonance in quasi-one-dimensional

TI Larkin, AN Yaresko, D Pröpper, KA Kikoin, YF Lu… - Physical Review B, 2017‏ - APS
We report the complex dielectric function of the quasi-one-dimensional chalcogenide Ta 2
NiSe 5, which undergoes a structural phase transition presumably associated with exciton …

A New Era of Excitonic Insulators

T Kaneko, Y Ohta - Journal of the Physical Society of Japan, 2025‏ - journals.jps.jp
The fundamental idea of the excitonic insulator (EI) driven by electron–hole correlations in
narrow-gap semiconductors or semimetals was originally proposed in the 1960s, and only …

Phase diagram and collective excitations in an excitonic insulator from an orbital physics viewpoint

J Nasu, T Watanabe, M Naka, S Ishihara - Physical Review B, 2016‏ - APS
An excitonic-insulating system is studied from a viewpoint of the orbital physics in strongly
correlated electron systems. An effective model Hamiltonian for low-energy electronic states …

Photoinduced gap closure in an excitonic insulator

D Golež, P Werner, M Eckstein - Physical Review B, 2016‏ - APS
We study the dynamical phase transition out of an excitonic insulator phase after
photoexcitation using a time-dependent extension of the self-consistent GW method. We …

Exciton-phonon cooperative mechanism of the triple- charge-density-wave and antiferroelectric electron polarization in

T Kaneko, Y Ohta, S Yunoki - Physical Review B, 2018‏ - APS
We investigate the microscopic mechanisms of the charge-density-wave (CDW) formation in
a monolayer TiSe 2 using a realistic multiorbital dp model with electron-phonon coupling …

Spin state ordering of strongly correlating induced at ultrahigh magnetic fields

A Ikeda, T Nomura, YH Matsuda, A Matsuo, K Kindo… - Physical Review B, 2016‏ - APS
Magnetization measurements of LaCoO 3 have been carried out up to 133 T, generated with
a destructive pulse magnet at a wide temperature range from 2 to 120 K. A novel magnetic …

Collective modes in excitonic magnets: Dynamical mean-field study

D Geffroy, J Kaufmann, A Hariki, P Gunacker… - Physical review …, 2019‏ - APS
We present a dynamical mean-field study of dynamical susceptibilities in the two-band
Hubbard model. Varying the model parameters we analyze the two-particle excitations in the …

Competition between excitonic charge and spin density waves: Influence of electron-phonon and Hund's rule couplings

T Kaneko, B Zenker, H Fehske, Y Ohta - Physical Review B, 2015‏ - APS
We analyze the stability of excitonic ground states in the two-band Hubbard model with
additional electron-phonon and Hund's rule couplings using a combination of mean-field …

Mott-enhanced exciton condensation in a Hubbard bilayer

S Giuli, A Amaricci, M Capone - Physical Review B, 2023‏ - APS
We study the conditions to realize an excitonic condensed phase in an electron-hole bilayer
system with local Hubbard-like interactions at half-filling, where we can address the interplay …