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Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm$_{1-x}M_x$B$_6$ ($M$=Eu, Ce)
- Source :
- Phys. Rev. B 104, 115118 (2021)
- Publication Year :
- 2021
-
Abstract
- SmB6 is a strongly correlated material that has been attributed as a topological insulator and a Kondo insulator. Recent studies have found the topological surface states and low temperature insulating character to be profoundly robust against magnetic and non-magnetic impurities. Here, we use angle resolved photoemission spectroscopy to chart the evolution of topologically-linked electronic structure features versus magnetic doping and temperature in Sm$_{1-x}$M$_x$B$_6$ (M=Eu, Ce). Topological coherence phenomena are observed out to unprecedented ~30% Eu and 50% Ce concentrations that represent extreme nominal hole and electron doping, respectively. Theoretical analysis reveals that a recent re-designation of the topologically inverted band symmetries provides a natural route to reconciling the persistence of topological surface state emergence even as the insulating gap is lost through decoherence.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 104, 115118 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2108.11453
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.104.115118