Weyl-Kondo semimetals: Phenomena and stabilization mechanisms

Gapless electronic topology driven by strong correlations is an emerging field of great interest, with heavy fermion compounds at its forefront. I will report on the giant signatures of topology observed in Ce₃Bi₄Pd₃, the material on which experiments [1,2], along with theoretical work on nonsymmorphic lattice models [3], have coined the notion of a Weyl-Kondo semimetal, and on the genuine topology control that can be achieved by magnetic field tuning, leading to the annihilation of the material’s Weyl nodes at moderate magnetic fields [4,5]. I will also discuss design strategies for further correlation-driven topological metals, and point to new candidate materials [6,7].

[1] S. Dzsaber, L. Prochaska, A. Sidorenko, G. Eguchi, R. Svagera, M. Waas, A. Prokofiev, Q. Si, and S. Paschen, Phys. Rev. Lett. 118, 246601 (2017).

[2] H.-H. Lai, S. E. Grefe, S. Paschen, and Q. Si, PNAS 115/1, 93 (2018).

[3] S. Dzsaber, X. Yan, M. Taupin, G. Eguchi, A. Prokofiev, T. Shiroka, P. Blaha, O. Rubel, S. E. Grefe, H.-H. Lai, Q. Si, and S. Paschen, PNAS 118, e2013386118 (2021).

[4] S. Dzsaber, D. A. Zocco, A. McCollam, F. Weickert, R. McDonald, M. Taupin, X. Yan, A. Prokofiev, L.M.K. Tang, B. Vlaar, L. E. Winter, M. Jaime, Q. Si, and S. Paschen, Nat. Commun. 13, 5729 (2022).

[5] S. E. Grefe, H.-H. Lai, S. Paschen, and Q. Si, arXiv:2012.15841.

[6] L. Chen, C. Setty, H. Hu, M. G. Vergniory, S. E. Grefe, L. Fischer, X. Yan, G. Eguchi, A. Prokofiev, S. Paschen, J. Cano, and Q. Si, Nat. Phys., Sept. 15 (2022), DOI:10.1038/s41567-022-01743-4.

[7] H. Hu, L. Chen, Ch. Setty, S. E. Grefe, A. Prokofiev, S. Kirchner, S. Paschen, J. Cano, and Q. Si, arXiv:2110.06182.