Date:
Thu, 22/02/2024
Is Ta2NiSe5 an excitonic insulator?
The excitonic insulator phase is characterized by spontaneous formation of excitons, which condense and open a gap in the single-particle spectrum. Nevertheless, conclusively recognizing an excitonic insulator poses difficulties due to the concurrent occurrence of structural phase transitions in candidate materials. I will address the ongoing, decade-long debate surrounding the semimetal-to-insulator transition in Ta2NiSe5 and the contentious discussion about its physical origin.
The excitonic insulator phase is characterized by spontaneous formation of excitons, which condense and open a gap in the single-particle spectrum. Nevertheless, conclusively recognizing an excitonic insulator poses difficulties due to the concurrent occurrence of structural phase transitions in candidate materials. I will address the ongoing, decade-long debate surrounding the semimetal-to-insulator transition in Ta2NiSe5 and the contentious discussion about its physical origin.