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Special Issue:
SPECIAL TOPIC — Topological semimetals
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| SPECIAL TOPIC—Topological semimetals |
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Optical investigation of topological semimetal SrMnSb2 |
| Zi-Yang Qiu(邱子阳)1,2, Zhi-Yu Liao(廖知裕)1,2, Xiang-Gang Qiu(邱祥冈)1,2,3 |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China |
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Abstract We investigate the temperature-dependent infrared spectroscopy of SrMnSb2, which is a semimetal with multiple Fermi surfaces. A notable blue shift of the plasma minimum in reflectivity upon cooling indicates that the carrier density varies with temperature. In the real part of the optical conductivity σ1(ω), a linearly-increased component which extrapolates to zero conductivity at finite frequency has been identified, which suggests dispersion of gapped Dirac band structures near the Fermi level. A two-Drude model, representing two different types of carriers, is introduced to describe the real part of optical conductivity. We separate the contributions of two-Drude model in dc conductivity, and demonstrate that the transport properties of SrMnSb2 are mainly affected by the narrow-Drude quasiparticles. Compared with the similar phenomena observed in CaMnSb2 and SrMnBi2, we can infer that the two-Drude model is an appropriate approach to investigate the multiband materials in AMnSb2 and AMnBi2 families.
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Received: 23 January 2019
Revised: 15 February 2019
Accepted manuscript online:
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PACS:
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78.30.-j
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(Infrared and Raman spectra)
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78.40.Kc
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(Metals, semimetals, and alloys)
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78.47.-p
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(Spectroscopy of solid state dynamics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11774400) and the National Key Basic Research Program of China (Grant Nos. 2015CB921102 and 2017YFA0302903). |
Corresponding Authors:
Xiang-Gang Qiu
E-mail: xgqiu@iphy.ac.cn
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Cite this article:
Zi-Yang Qiu(邱子阳), Zhi-Yu Liao(廖知裕), Xiang-Gang Qiu(邱祥冈) Optical investigation of topological semimetal SrMnSb2 2019 Chin. Phys. B 28 047801
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