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Title: Observation of Dirac-like semi-metallic phase in NdSb

Abstract

The search of new topological phases of matter is one of the new directions in condensed matter physics. Recent experimental realizations of Dirac semimetal phases pave the way to look for other exotic phases of matter in real materials. In this paper, we present a systematic angle-resolved photoemission spectroscopy (ARPES) study of NdSb, a potential candidate for hosting a Dirac semi-metal phase. Our studies reveal two hole-like Fermi surface pockets present at the zone center ($$\Gamma$$ ) point as well as two elliptical electron-pockets present in the zone corner (X) point of the Brillouin zone (BZ). Interestingly, Dirac-like linearly dispersive states are observed about the zone corner (X) point in NdSb. Our first-principles calculations agree with the experimentally observed bands at the $$\Gamma$$ point. Moreover, the Dirac-like state observed in NdSb may be a novel correlated state, not yet predicted in calculations. Finally, our study opens a new direction to look for Dirac semi-metal states in other members of the rare earth monopnictide family.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1];  [3];  [2];  [3];  [3]
  1. Univ. of Central Florida, Orlando, FL (United States). Dept. of Physics
  2. Princeton Univ., NJ (United States). Joseph Henry Lab. Dept. of Physics
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Princeton Univ., NJ (United States); Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Gordon and Betty Moore Foundation (United States)
OSTI Identifier:
1441303
Report Number(s):
LA-UR-17-22718
Journal ID: ISSN 0953-8984; TRN: US1900887
Grant/Contract Number:  
AC52-06NA25396; NSF-DMR-1507585; NSF-DMR-1006492; GBMF4547
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 23; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Neupane, Madhab, Mofazzel Hosen, M., Belopolski, Ilya, Wakeham, Nicholas, Dimitri, Klauss, Dhakal, Nagendra, Zhu, Jian-Xin, Zahid Hasan, M., Bauer, Eric D., and Ronning, Filip. Observation of Dirac-like semi-metallic phase in NdSb. United States: N. p., 2016. Web. doi:10.1088/0953-8984/28/23/23LT02.
Neupane, Madhab, Mofazzel Hosen, M., Belopolski, Ilya, Wakeham, Nicholas, Dimitri, Klauss, Dhakal, Nagendra, Zhu, Jian-Xin, Zahid Hasan, M., Bauer, Eric D., & Ronning, Filip. Observation of Dirac-like semi-metallic phase in NdSb. United States. doi:10.1088/0953-8984/28/23/23LT02.
Neupane, Madhab, Mofazzel Hosen, M., Belopolski, Ilya, Wakeham, Nicholas, Dimitri, Klauss, Dhakal, Nagendra, Zhu, Jian-Xin, Zahid Hasan, M., Bauer, Eric D., and Ronning, Filip. Mon . "Observation of Dirac-like semi-metallic phase in NdSb". United States. doi:10.1088/0953-8984/28/23/23LT02. https://www.osti.gov/servlets/purl/1441303.
@article{osti_1441303,
title = {Observation of Dirac-like semi-metallic phase in NdSb},
author = {Neupane, Madhab and Mofazzel Hosen, M. and Belopolski, Ilya and Wakeham, Nicholas and Dimitri, Klauss and Dhakal, Nagendra and Zhu, Jian-Xin and Zahid Hasan, M. and Bauer, Eric D. and Ronning, Filip},
abstractNote = {The search of new topological phases of matter is one of the new directions in condensed matter physics. Recent experimental realizations of Dirac semimetal phases pave the way to look for other exotic phases of matter in real materials. In this paper, we present a systematic angle-resolved photoemission spectroscopy (ARPES) study of NdSb, a potential candidate for hosting a Dirac semi-metal phase. Our studies reveal two hole-like Fermi surface pockets present at the zone center ($\Gamma$ ) point as well as two elliptical electron-pockets present in the zone corner (X) point of the Brillouin zone (BZ). Interestingly, Dirac-like linearly dispersive states are observed about the zone corner (X) point in NdSb. Our first-principles calculations agree with the experimentally observed bands at the $\Gamma$ point. Moreover, the Dirac-like state observed in NdSb may be a novel correlated state, not yet predicted in calculations. Finally, our study opens a new direction to look for Dirac semi-metal states in other members of the rare earth monopnictide family.},
doi = {10.1088/0953-8984/28/23/23LT02},
journal = {Journal of Physics. Condensed Matter},
number = 23,
volume = 28,
place = {United States},
year = {2016},
month = {5}
}

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Figures / Tables:

FIG. 1: FIG. 1:: Brillouin zone, electronic structure and sample characterization of NdSb. (a) Rock-salt type crystal structure of NdSb, where yellow spheres represent Nd and blue spheres represent Sb. (b) Schematic 3D bulk Brillouin zone (BZ) and projected surface BZ of face-centered cubic lattice NdSb. High symmetry points are also marked.more » (c) First-principles band structure calculations along the high symmetry lines of bulk NdSb. Fermi level is also shown by dashed line. Inset shows the calculated bulk Fermi surface. (d) Core level spectrum of NdSb, which shows the sharp peak of Sb 4d and Nd 5p. This data is collected with a photon energy of 100eV. Inset shows the resistivity of NdSb as a function of temperature. A peak at ∼ 15 K indicates the magnetic transition temperature (TN ). Photoemission spectroscopy (PES) data were collected at SIS-HRPES end-station at SLS, PSI.« less

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