Microscopic quantum interference in excitonic condensation of Ta${}_2$NiSe${}_5$

Koudai Sugimoto, Tatsuya Kaneko, Yukinori Ohta

The microscopic quantum interference associated with excitonic condensation in Ta${}_2$NiSe${}_5$ is studied in the BCS-type mean-field approximation. We show that in ultrasonic attenu…