Abstract

In materials, new quasi-particles can emerge as collective excitations of ordered states. Detecting
these modes and their associated properties is an essential step to understanding these new phases.
Here, I will discuss the utility of Raman Spectroscopy in detecting the various excitations that emerge
in quantum materials. I will focus on our discovery of an Axial Higgs mode emerging from a Charge
Density Wave (CDW) in the 2D Material family RTe3. For decades, the CDW in RTe3 was considered
conventional. However, using quantum interference and various optical techniques, we have proved
that a hidden Ferroaxial order emerges from a combined orbital and charge order. Time permitting, I
will also briefly discuss our efforts to combine quantum optics with Raman to detect entanglement and
our observation that exfoliation changes the interwined orders in FeSe.

https://uni-frankfurt.zoom.us/j/64682894085?pwd=T2hGTmNHZFB3ZFZvc1gyT2ZQVWYxdz09
Meeting ID: 646 8289 4085
Passcode: 205901