Host: Eun-Ah Kim, Debanjan Chowdhury, & Chao-Ming Jian

Title: Non-Fermi liquids in Multipolar Quantum Materials

Abstract: 

Non-Fermi liquids, characterized by anomalous scaling of thermodynamic and transport properties, are present in a variety of prominent settings such as in cuprates and heavy fermion materials. In this talk, I will discuss how the embedding of multipolar local moments in a metallic host offers a new route to uncover novel non-Fermi liquid states. In this so-called multipolar Kondo effect, conduction electrons interact with localized moments that do not carry any dipole, but possess only higher-rank multipolar, moments. Using renormalization group and conformal field theory approaches, I present the solution of a multipolar Kondo problem, where conduction spin and orbital entangled fluctuations give rise to an unusual non-Fermi liquid state with highly singular scaling in its response functions. This work lays the foundation for the discovery of a variety of non-Fermi liquid ground states in quantum materials through the introduction of multipolar moments in itinerant electron systems.

[1] Adarsh S. Patri, Ilia Khait, and Yong Baek Kim, Phys. Rev. Research 2, 013257 (2020).

[2] Adarsh S. Patri and Yong Baek Kim, Phys. Rev. X 10, 041021 (2020).

Poster