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Condensed Matter Seminar - "Non-Fermi Liquids and Novel Broken Symmetries in Multipolar Quantum Materials"

Event Type
UIUC Department Of Physics - Condensed Matter
Via ZOOM - see description for link
Nov 13, 2020   1:00 pm  
Yong-Baek Kim, University of Toronto
Stephen Bullwinkel
Originating Calendar
Physics - Condensed Matter Seminar

The hallmarks of non-Fermi liquids are singular thermodynamic and transport properties that are distinct from those associated with a Fermi liquid. Non-Fermi liquid behaviors are famously seen in cuprates, heavy fermion materials, and metallic quantum critical systems. In this talk, I discuss possible non-Fermi liquids in multipolar quantum materials, where conduction electrons interact with the local moments that do not carry any dipole moment, but possess higher-rank quadrupolar and octupolar moments. This theoretical work is partly motivated by recent experiments on cubic f-electron systems, where the local moments arise from non-Kramers ground states.


I present the renormalization group and conformal field theory solutions of a multipolar Kondo problem, where a single multipolar moment is interacting with the orbital and spin degrees of freedom of conduction electrons. I show that an unexpected non-Fermi liquid state arises in this system. I also discuss hidden multipolar orders in the lattice version of the model and how to experimentally detect such subtle broken symmetries.


Zoom link will be forwarded to Condensed Matter Seminar email list.  For a copy of the link or to be added to the email list, please contact Stephen Bullwinkel (


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