Multiple triple-point fermions in Heusler compounds

Barik, Ranjan Kumar and Shinde, Ravindra and Singh, Abhishek K (2018) Multiple triple-point fermions in Heusler compounds. In: JOURNAL OF PHYSICS-CONDENSED MATTER, 30 (37).

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Abstract

Using the density functional theoretical calculations, we report a new set of topological semimetals X(2)YZ (X = {Cu, Rh, Pd, Ag, Au, Hg}, Y = {Li, Na, Sc, Zn, Y, Zr, Hf, La, Pr, Pm, Sm, Tb, Dy, Ho, Tm} and Z = {Mg, Al, Zn, Ga, Y, Ag, Cd, In, Sn, Ta, Sin)), which show the existence of multiple topological triple point fermions along four independent (C) over tilde (3) axes. These fermionic quasiparticles have no analogues elementary particle in the standard model. The angle-resolved photoemission spectroscopy is simulated to obtain the exotic topological surface states and the characteristic Fermi arcs. The inclusion of spin-orbit coupling splits the triple-point to two Dirac points. The triple-point fermions are exhibited on the easily cleavable (1 1 1) surface and are well separated from the surface (Gamma) over bar point, allowing them to be resolved in the surface spectroscopic techniques. This intermediate linearly dispersive degeneracy between Weyl and Dirac points may offer prospective candidates for quantum transport applications.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copy right for this article belong to IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Keywords:	topological materials; triple point fermion; semimetals
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	11 Sep 2018 14:56
Last Modified:	11 Sep 2018 14:56
URI:	http://eprints.iisc.ac.in/id/eprint/60643

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