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Sixfold fermion near the Fermi level in cubic PtBi2
by S. Thirupathaiah, Y. S. Kushnirenk, K. Koepernik, B. R. Piening, B. Buechner, S. Aswartham, J. van den Brink, S. V. Borisenko, I. C. Fulga
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Submission summary
| Authors (as registered SciPost users): | Ion Cosma Fulga · Setti Thirupathaiah · Jeroen van den Brink |
| Submission information | |
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| Preprint Link: | scipost_202011_00002v1 (pdf) |
| Date accepted: | 2020-12-03 |
| Date submitted: | 2020-11-03 15:52 |
| Submitted by: | Fulga, Ion Cosma |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Experimental |
Abstract
We show that the cubic compound PtBi2, is a topological semimetal hosting a sixfold band touching point in close proximity to the Fermi level. Using angle-resolved photoemission spectroscopy, we map the bandstructure of the system, which is in good agreement with results from density functional theory. Further, by employing a low energy effective Hamiltonian valid close to the crossing point, we study the effect of a magnetic field on the sixfold fermion. The latter splits into a total of twenty Weyl cones for a Zeeman field oriented in the diagonal, [111] direction. Our results mark cubic PtBi2, as an ideal candidate to study the transport properties of gapless topological systems beyond Dirac and Weyl semimetals.
Author comments upon resubmission
https://www.dropbox.com/s/38d82fjlasf7q6x/reply.pdf?dl=0
List of changes
Text changes are marked in red.
- We have marked the theoretical calculations with the `theory' label in Figs. 1-4.
- We have added arrows to Figs. 1 and 2, pointing to the features mentioned in the main text.
- We have added a new panel in Fig. 2, showing a side-by-side comparison of Brillouin zones at different energies.
- We have replaced the crosses with arrows in Fig. 4.
- On page 6, before the Conclusion section, we have added a sentence pointing to our uploaded code. The latter confirms the Weyl nature of the band crossing points.
Published as SciPost Phys. 10, 004 (2021)