COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |
Topological Kondo semimetalsAdd to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Romy Hall. In this presentation, we will report our recent progress on studying the topological properties of the correlated semimetals YbPtBi and RX (R = Ce, Pr, Sm; X=Sb, Bi). Evidence for Weyl fermions has also been found in the heavy fermion semimetal YbPtBi. At higher temperatures where the Kondo interaction is weaker, the presence of Weyl fermions is inferred from the chiral anomaly in magnetotransport measurements, as well as the ARPES measurements and DFT calculations [1]. Upon lowering temperature, the Kondo interaction between the 4f electrons and conduction electrons is strengthened and therefore the electronic bands are renormalized. As a result, the contributions of chiral anomaly to the magnetotransport become negligible in the heavy fermion state. Instead, we obtained evidence for Weyl fermions at low temperatures from the measurements of specific heat and topological Hall effect. [1]. These results demonstrate that the Weyl fermion state is modified upon increasing the hybridization strength, providing a good opportunity to study the relationship between topologic states, electron-electron correlations and quantum criticality. The RX family of materials show very large magnetoresistance. Both trivial and non-trivial band topologies are observed in these compounds [2]. Angular dependent magnetoresistance measurements and band structure calculations provide evidence for Weyl fermions in the field-induced ferromagnetic state of CeSb [3]. In PrSb a trivial topology is revealed [4], whereas evidence for a non-trivial topology is found in SmSb, which quantum oscillations show anomalous behavior [5]. [1] C. Y. Guo et al., arXiv: 1710.05522, Nat. Commun. (accepted). [2] P. Li et al., Phys. Rev. B 98 , 085103 (2018); X. Duan et al., arXiv: 1802.04554 [3] C. Y. Guo et. al., npj Quantum Materials 2, 39 (2017). [4] F. Wu et al., Phys. Rev. B 96 , 125122 (2018). [5] F. Wu et al., arXiv: 1807.03070 (2018). This talk is part of the Quantum Matter Seminar series. This talk is included in these lists:
Note that ex-directory lists are not shown. |
Other listsEnterprise Tuesday 2010/2011 CUSPE Forum Kavli Institute for Cosmology - Summer SeriesOther talksOrganoids and clonal analysis to study cell community interactions during pancreas development Power analysis Let them eat plants: how can cafeterias encourage more vegetarian sales and reduce meat consumption? The Solar Revolution – Who Made It Happen? 'The architecture of the semantic network' and 'From pixels to semantics - machine learning as a key to understanding the dynamic computations along the human ventral stream' Professor Bjorn Basberg: Two Strategies - C.A.Larsen and Chr. Christensen: a comparative analysis of two Antarctic Entrepreneurs |