Sixfold fermion near the Fermi level in cubic PtBi2

Thirupathaiah, Setti; Kushnirenk, Y. S.; Koepernik, Klaus; Piening, B. R.; Büchner, Bernd; Aswartham, S.; van den Brink, Jeroen; Borisenko, Sergey; Fulga, Ion Cosma

doi:10.21468/SciPostPhys.10.1.004

SciPost Physics

Sixfold fermion near the Fermi level in cubic PtBi2

S. Thirupathaiah, Y. S. Kushnirenk, K. Koepernik, B. R. Piening, B. Buechner, S. Aswartham, J. van den Brink, S. V. Borisenko, I. C. Fulga

SciPost Phys. 10, 004 (2021) · published 11 January 2021

doi: 10.21468/SciPostPhys.10.1.004
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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.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.10.1.004
TI  - Sixfold fermion near the Fermi level in cubic PtBi2
PY  - 2021/01/11
UR  - https://scipost.org/SciPostPhys.10.1.004
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 10
IS  - 1
SP  - 004
A1  - Thirupathaiah, Setti
AU  - Kushnirenk, Y. S.
AU  - Koepernik, Klaus
AU  - Piening, B. R.
AU  - Büchner, Bernd
AU  - Aswartham, S.
AU  - van den Brink, Jeroen
AU  - Borisenko, Sergey
AU  - Fulga, Ion Cosma
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.10.1.004,
	title={{Sixfold fermion near the Fermi level in cubic PtBi2}},
	author={S. Thirupathaiah and Y. S. Kushnirenk and K. Koepernik and B. R. Piening and B. Buechner and S. Aswartham and J. van den Brink and S. V. Borisenko and I. C. Fulga},
	journal={SciPost Phys.},
	volume={10},
	pages={004},
	year={2021},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.10.1.004},
	url={https://scipost.org/10.21468/SciPostPhys.10.1.004},
}

Cited by 8

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¹ ² Setti Thirupathaiah,
¹ Y. S. Kushnirenk,
¹ ³ Klaus Koepernik,
¹ B. R. Piening,
¹ ³ Bernd Büchner,
¹ S. Aswartham,
¹ ³ Jeroen van den Brink,
¹ Sergey Borisenko,
¹ ³ Ion Cosma Fulga

Funders for the research work leading to this publication

Bundesministerium für Bildung und Forschung / Federal Ministry of Education and Research [BMBF]
Department of Science and Technology, Ministry of Science and Technology (through Organization: विज्ञान एवं प्रौद्योगिकी विभाग / Department of Science and Technology [DST])
Deutsche Forschungsgemeinschaft / German Research FoundationDeutsche Forschungsgemeinschaft [DFG]