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Electrodynamic properties of the semimetallic Dirac material SrMnBi2: Two-carrier-model analysis

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Title
Electrodynamic properties of the semimetallic Dirac material SrMnBi2: Two-carrier-model analysis
Author(s)
H. J. Park; Byung Cheol Park; Min-Cheol Lee; Dawoon Jeong; Joonbum Park; Jun Sung Kim; Hyo Seok Ji; J. H. Shim; K. W. Kim; S. J. Moon; Hyeong-Do Kim; Deok-Yong Cho; T. W. Noh
Publication Date
2017-10
Journal
PHYSICAL REVIEW B, v.96, no.15, pp.155139
Publisher
AMER PHYSICAL SOC
Abstract
The electrodynamics of free carriers in the semimetallic Dirac material SrMnB i 2 was investigated using optical spectroscopy and first-principles calculations. Using a two-carrier-model analysis, the total free-carrier response was successfully decomposed into individual contributions from Dirac fermions and non-Dirac free carriers. Possible roles of chiral pseudospin, spin-orbit interaction (SOI), antiferromagnetism, and electron-phonon (e−ph)coupling in the Dirac fermion transport were also addressed. The Dirac fermions possess a low scattering rate of ∼10meV at low temperature and thereby experience coherent transport. However, at high temperatures, we observed that the Dirac fermion transport becomes significantly incoherent, possibly due to strong e−ph interactions. The SOI-induced gap and antiferromagnetism play minor roles in the electrodynamics of the free carriers in SrMnB i2. We also observed a seemingly optical-gap-like feature near 120 meV, which emerges at low temperatures but becomes filled in with increasing temperature. This gap-filling phenomenon is ascribed to phonon-assisted indirect transitions promoted at high temperatures. © 2017 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4160
DOI
10.1103/PhysRevB.96.155139
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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