**Time/Date** Wednesday, March 15 at 11:00 am PST in Physics South 402 and via Zoom:

https://berkeley.zoom.us/j/99523499113pwd=REovb3pyam03WXQwbEhrU3dqNHZvdz09

Meeting ID: 995 2349 9113 Passcode: 600704

(Please note: we will enter 402 after a class ends at 2 pm.)**Host **Joel Moore **Title** Probing Band Topology in Theory & RIXS Experiment**Abstract** Since the discovery of the topological band insulator, “topology” has become the most important information of the many-body ground states in condensed matter physics. Despite its importance, it is not always straightforward to detect the information both in theory and experiment. This problem becomes particularly serious when the strong correlation presents. In the first part of this talk, we will present our novel detection scheme for the topology, applicable even when there are significant correlations. We demonstrate the performance of our scheme on several prototypical topological insulators such as Chern insulator, Su-Schrieffer-Heeger chain, multipolar insulators, boundary-polarization model, and chiral hinge insulators[1-4]. In the second part of this talk, we will show that some of these topological insulators leave definitive fingerprints in resonant inelastic X-ray scatterings (RIXS), which enables the unambiguous experimental detection of the topological band indices [5].

**Ref:**

[1] Kang, Shiozaki, GYC, Phys. Rev. B (2019)

[2] Lee, GYC, Kang, Phys. Rev. B (2022)

[3] Park, Kim, GYC, Lee, Phys. Rev. Lett (2019)

[4] Kang, Lee, GYC, Phys. Rev. Lett. (2021)

[5] Lee, Jin, Kang, Kim, GYC, Phys. Rev. B (2023)