Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/23/23LT02
Keywords
topological; semi-metal; Dirac; ARPES; NdSb; rare earth monopnictide
Categories
Funding
- University of Central Florida (UCF)
- NSF GRFP
- Emergent Phenomena in Quantum Systems Initiative of the Gordon and Betty Moore Foundation [GBMF4547]
- National Science Foundation, Division of Materials Research [NSF-DMR-1507585, NSF-DMR-1006492]
- U.S. Department of Energy, Office of Science
- Los Alamos National Laboratory LDRD program
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507585] Funding Source: National Science Foundation
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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. Here 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. Our study opens a new direction to look for Dirac semi-metal states in other members of the rare earth monopnictide family.
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