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

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.

Authors:
 [1];  [2];  [1]
  1. Columbia Univ., New York, NY (United States)
  2. Inst. for Basic Science, Daejeon (Korea, Republic of)
Publication Date:
Research Org.:
Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1511821
Alternate Identifier(s):
OSTI ID: 1410392
Grant/Contract Number:  
FG02-04ER46169
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 19; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wang, Runzhi, Go, Ara, and Millis, Andrew. Weyl rings and enhanced susceptibilities in pyrochlore iridates: k·p analysis of cluster dynamical mean-field theory results. United States: N. p., 2017. Web. doi:10.1103/physrevb.96.195158.
Wang, Runzhi, Go, Ara, & Millis, Andrew. Weyl rings and enhanced susceptibilities in pyrochlore iridates: k·p analysis of cluster dynamical mean-field theory results. United States. doi:10.1103/physrevb.96.195158.
Wang, Runzhi, Go, Ara, and Millis, Andrew. Mon . "Weyl rings and enhanced susceptibilities in pyrochlore iridates: k·p analysis of cluster dynamical mean-field theory results". United States. doi:10.1103/physrevb.96.195158. https://www.osti.gov/servlets/purl/1511821.
@article{osti_1511821,
title = {Weyl rings and enhanced susceptibilities in pyrochlore iridates: k·p analysis of cluster dynamical mean-field theory results},
author = {Wang, Runzhi and Go, Ara and Millis, Andrew},
abstractNote = {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.},
doi = {10.1103/physrevb.96.195158},
journal = {Physical Review B},
number = 19,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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