Nonsymmorphic Dirac semimetal and carrier dynamics in the doped spin-orbit-coupled Mott insulator Sr2IrO4
- Authors
- Han, J. W.; Kim, Sun-Woo; Kyung, W. S.; Kim, C.; Cao, G.; Chen, X.; Wilson, S. D.; Cheon, Sangmo; Lee, J. S.
- Issue Date
- Jul-2020
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.102, no.4, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 102
- Number
- 4
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/145446
- DOI
- 10.1103/PhysRevB.102.041108
- ISSN
- 2469-9950
- Abstract
- A Dirac fermion emerges as a result of interplay between symmetry and topology in condensed matter. Current research moves towards investigating the Dirac fermions in the presence of many-body effects in correlated systems. Here, we demonstrate the emergence of a correlation-induced symmetry-protected Dirac semimetal state in the lightly doped spin-orbit-coupled Mott insulator Sr2IrO4. We find that the nonsymmorphic crystalline symmetry stabilizes a Dirac line-node semimetal and that the correlation-induced symmetry-breaking electronic order further leads to a phase transition from the Dirac line-node to a Dirac point-node semimetal. The latter state is experimentally confirmed by angle-resolved photoemission spectroscopy and terahertz spectroscopy on Sr-2(Ir, Tb)O-4 and (Sr, La)(2)IrO4. Remarkably, the electrodynamics of the massless Dirac carriers is governed by the extremely small scattering rate of about 6 cm(-1) even at room temperature, which is iconic behavior of relativistic quasiparticles. Temperature-dependent changes in electrodynamic parameters are also consistently explained based on the Dirac point-node semimetal state.
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