SCES Webinar Series

Título: Weyl-Kondo Semimetal – How Strong Correlations Intersect with Topology

Strongly correlated metals are known to display a rich variety of quantum phases. Whether and how they also produce electronic topology is of considerable current interest and, yet, a largely open question. A promising setting arises in heavy fermion systems, which may contain not only strong correlations but also a large spin-orbit coupling. Recently, a Weyl-Kondo semimetal state has been concurrently discovered in theoretical [1] and experimental [2] studies. It has several defining characteristics, including: Weyl nodes that are pinned to the Fermi energy; and linearly-dispersing nodal excitations with highly reduced velocity. They have clear signatures in thermodynamic [2] and transport [3] properties that are quite unique to the strongly correlated setting. Nonsymmorphic space-group symmetry plays an important role in realizing the Weyl-Kondo semimetal phase [4]. In this talk, I will summarize these developments, discuss how they open up a general strategy for strong correlations to cooperate with space-group symmetry in creating topological conductors, and draw their implications for the strong correlation physics in general through a global phase diagram.

Work done in collaboration with Sarah Grefe, Hsin-Hua Lai, Sami Dzsaber, and Silke Paschen, and supported by NSF (DMR-1920740) and the Robert A. Welch Foundation (C-1411).

[1] H.-H. Lai et al., PNAS 115, 93 (2018).

[2] S. Dzsaber et al., Phys. Rev. Lett. 118, 246601 (2017).

[3] S. Dzsaber et al., arXiv:1811.02819; arXiv:1906.01182.

[4] S. E. Grefe et al., Phys. Rev. B 101, 075138 (2020).

O evento será transmitido pelo Zoom: https://us02web.zoom.us/j/5565055558?pwd=amZCMWpJMkRaWjRKZE1HcW1OKzJtQT09, pelo Google Meets: meet.google.com/bmc-pamy-hix e na página do Facebook do IFGW https://www.facebook.com/FisicaUnicamp/