Wednesday, June 26, 2019, 2:30 pm — Bldg. 734, ISB Conference Room 201 (upstairs)
Spontaneous symmetry breaking is a prominent demonstration of the collective behavior of strongly correlated systems. Besides ordering of charge or of spin dipoles, more exotic types of long-range order are possible, which do not couple to conventional probes and are therefore sometimes called the hidden order. Excitonic magnets, or excitonic condensates, are examples of such systems. I will introduce the concept of excitonic condensate from the strong coupling perspective and discuss the rich variety of excitonic phases arising from the internal (spin, orbital) degrees of freedom of the excitons. I will present some numerical results obtained with dynamical mean-field theory for models as well as for specific materials, which we suspect to be excitonic magnets. The presentation will include the recently obtained results for dynamical susceptibilities in phases with long-range order and some proposals on how to detect excitonic condensates with today's experimental techniques.
Hosted by: Keith Gilmore
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