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Gapped Dirac semimetal with mixed linear and parabolic dispersions
- Source :
- Physical Review B 103, 115202 (2021)
- Publication Year :
- 2021
-
Abstract
- In this paper, we make a comprehensive study of the properties of a gapped Dirac semimetal model, which was originally proposed in the magnetoinfrared spectroscopy measurement of ZeTe$_5$, and includes both the linear and parabolic dispersions in all three directions. We find that, depending on the band inversion parameters, $\zeta'$ and $\zeta_z'$, the model can support three different phases: the single Dirac point (DP) phase, the double DPs phase and the Dirac ring phase. The three different phases can be distinguished by their low-energy features in the density of states (DOS) and optical conductivity. At high energy, both the DOS and optical conductivity exhibit power-law like behaviors, with the asymptotic exponents depending heavily on the signs of $\zeta'$ and $\zeta_z'$. Moreover, the thumb-of-rule formula between the DOS and optical conductivity is satisfied only when $(\zeta',\zeta_z')>0$. The implications of our results for experiments are discussed.<br />Comment: 8 pages, 5 figures
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Physical Review B 103, 115202 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2107.04933
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.103.115202