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Title: Anisotropic Dirac Fermions in BaMnBi 2 and BaZnBi 2

Here, we investigate the electronic structure of BaMnBi 2 and BaZnBi 2 using angle-resolved photoemission spectroscopy and first-principles calculations. Although they share similar structural properties, we show that their electronic structure exhibit dramatic differences. A strong anisotropic Dirac dispersion is revealed in BaMnBi 2 with a decreased asymmetry factor compared with other members of AMnBi 2 (A = alkali earth or rare earth elements) family. In addition to the Dirac cones, multiple bands crossing the Fermi energy give rise to a complex Fermi surface topology for BaZnBi 2. We further show that the strength of hybridization between Bi-p and Mn-d/Zn-s states is the main driver of the differences in electronic structure for these two related compounds.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ORCiD logo [3] ; ORCiD logo [6] ; ORCiD logo [7]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Pohang Univ. of Science and Technology, Pohang (Korea); Korea Institute of Science and Technology, Seoul (Korea)
  2. Univ. of California, Berkeley, CA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences, Shenyang (China)
  5. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy Nanosciences Institute at Berkeley, Berkeley, CA (United States)
  6. Pusan National Univ., Busan (Korea)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Report Number(s):
BNL-209434-2018-JAAM
Journal ID: ISSN 2045-2322
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1482089

Ryu, Hyejin, Park, Se Young, Li, Lijun, Ren, Weijun, Neaton, Jeffrey B., Petrovic, Cedomir, Hwang, Choongyu, and Mo, Sung -Kwan. Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2. United States: N. p., Web. doi:10.1038/s41598-018-33512-w.
Ryu, Hyejin, Park, Se Young, Li, Lijun, Ren, Weijun, Neaton, Jeffrey B., Petrovic, Cedomir, Hwang, Choongyu, & Mo, Sung -Kwan. Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2. United States. doi:10.1038/s41598-018-33512-w.
Ryu, Hyejin, Park, Se Young, Li, Lijun, Ren, Weijun, Neaton, Jeffrey B., Petrovic, Cedomir, Hwang, Choongyu, and Mo, Sung -Kwan. 2018. "Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2". United States. doi:10.1038/s41598-018-33512-w. https://www.osti.gov/servlets/purl/1482089.
@article{osti_1482089,
title = {Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2},
author = {Ryu, Hyejin and Park, Se Young and Li, Lijun and Ren, Weijun and Neaton, Jeffrey B. and Petrovic, Cedomir and Hwang, Choongyu and Mo, Sung -Kwan},
abstractNote = {Here, we investigate the electronic structure of BaMnBi2 and BaZnBi2 using angle-resolved photoemission spectroscopy and first-principles calculations. Although they share similar structural properties, we show that their electronic structure exhibit dramatic differences. A strong anisotropic Dirac dispersion is revealed in BaMnBi2 with a decreased asymmetry factor compared with other members of AMnBi2 (A = alkali earth or rare earth elements) family. In addition to the Dirac cones, multiple bands crossing the Fermi energy give rise to a complex Fermi surface topology for BaZnBi2. We further show that the strength of hybridization between Bi-p and Mn-d/Zn-s states is the main driver of the differences in electronic structure for these two related compounds.},
doi = {10.1038/s41598-018-33512-w},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {10}
}

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