Universität zu Köln

Berke, Christoph, Michetti, Paolo and Timm, Carsten (2018). Stability of the Weyl-semimetal phase on the pyrochlore lattice. New J. Phys., 20. BRISTOL: IOP PUBLISHING LTD. ISSN 1367-2630

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Abstract

Motivated by the proposal of a Weyl-semimetal phase in pyrochlore iridates, we consider a Hubbard-type model on the pyrochlore lattice. To shed light on the question as to why such a state has not been observed experimentally, its robustness is analyzed. On the one hand, we study the possible phases when the system is doped. Magnetic frustration favors several phases with magnetic and charge order that do not occur at half filling, including additional Weyl-semimetal states close to quarter filling. On the other hand, we search for density waves that break translational symmetry and destroy the Weyl-semimetal phase close to half filling. The uniform Weyl semimetal is found to be stable, which we attribute to the low density of states close to the Fermi energy.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Berke, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Michetti, Paolo UNSPECIFIED UNSPECIFIED UNSPECIFIED Timm, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-189029
DOI:	10.1088/1367-2630/aab881
Journal or Publication Title:	New J. Phys.
Volume:	20
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1367-2630
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INSULATORS; DISCOVERY; NEUTRINOS; TOPOLOGY; FERMIONS; ABSENCE Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18902