Speaker
Dr
Dominique Geffroy
(Masaryk University, Brno)
Description
We present a dynamical mean-field study of dynamical susceptibility in the two-orbital Hubbard model across the exciton condensation transition. We observe the appearance of Goldstone modes consistent with the broken symmetries. Reducing continuously the symmetry of the Hamiltonian we open gaps in the Goldstone modes. Upon increasing the amplitude of the symmetry breaking terms the character of the gapped modes smoothly changes from gapped Goldstone modes to Higgs amplitude fluctuations. Another notable observation is a qualitative change of the dynamical spin structure factor upon exciton condensation, which may be used as an experimentally accessible probe of the spin-triplet exciton condensate.
Primary author
Dr
Dominique Geffroy
(Masaryk University, Brno)
Co-authors
Dr
Jan Kuneš
(TU Wien, Austria)
Dr
Atsushi Hariki
(TU Wien, Austria)
Mr
Josef Kaufmann
(TU Wien, Austria )
Mr
Andreas Hausoel
(Univesity of Würzburg, Germany)
Dr
Patrik Gunacker
(TU Wien, Austria)
