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Weyl rings and enhanced susceptibilities in pyrochlore iridates: k · p analysis of cluster dynamical mean-field theory results

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Title
Weyl rings and enhanced susceptibilities in pyrochlore iridates: k · p analysis of cluster dynamical mean-field theory results
Author(s)
Wang R.; Go A.; Millis A.
Publication Date
2017-11
Journal
PHYSICAL REVIEW B, v.96, no.19, pp.195158 -
Publisher
AMER PHYSICAL SOC
Abstract
We match analytic results to numerical calculations to provide a detailed picture of the metal-insulator and topological transitions found in density functional plus cluster dynamical mean-field calculations of pyrochlore iridates. We discuss the transition from Weyl metal to Weyl semimetal regimes, and then analyze in detail the properties of the Weyl semimetal phase and its evolution into the topologically trivial insulator. The energy scales in the Weyl semimetal phase are found to be very small, as are the anisotropy parameters. The electronic structure can, to a good approximation, be described as Weyl rings and one of the two branches that contributes to the Weyl bands is essentially flat, leading to enhanced susceptibilities. The optical longitudinal and Hall conductivities are determined; the frequency dependence includes pronounced features that reveal the basic energy scales of the Weyl semimetal phase. © 2017 American Physical Society, ©2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/4421
DOI
10.1103/PhysRevB.96.195158
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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