Optical absorption window in Na3Bi based three-dimensional Dirac electronic system

doi:10.1063/5.0022669

	Optical absorption window in Na3Bi based three-dimensional Dirac electronic system
	Li, Q. N.2,4; Xu, W.2,3,4; Xiao, Y. M.2,4; Ding, L.2,4; Van Duppen, B.1; Peeters, F. M.1,2,4
刊名	JOURNAL OF APPLIED PHYSICS
	2020-10-21
卷号	128
ISSN号	0021-8979
DOI	10.1063/5.0022669
通讯作者	Xu, W.(wenxu_issp@aliyun.com)
英文摘要	We present a detailed theoretical study of the optoelectronic properties of a Na3Bi based three-dimensional Dirac electronic system (3DDES). The optical conductivity is evaluated using the energy-balance equation derived from a Boltzmann equation, where the electron Hamiltonian is taken from a simplified k . p approach. We find that for short-wavelength irradiation, the optical absorption in Na3Bi is mainly due to inter-band electronic transitions. In contrast to the universal optical conductance observed for graphene, the optical conductivity for Na3Bi based 3DDES depends on the radiation frequency but not on temperature, carrier density, and electronic relaxation time. In the radiation wavelength regime of about 5 mu m, < lambda < 200 mu m, an optical absorption window is found. This is similar to what is observed in graphene. The position and width of the absorption window depend on the direction of the light polarization and sensitively on temperature, carrier density, and electronic relaxation time. Particularly, we demonstrate that the inter-band optical absorption channel can be switched on and off by applying the gate voltage. This implies that similar to graphene, Na3Bi based 3DDES can also be applied in infrared electro-optical modulators. Our theoretical findings are helpful in gaining an in-depth understanding of the basic optoelectronic properties of recently discovered 3DDESs.
资助项目	National Natural Science Foundation of China (NNSFC)[U1930116] ; National Natural Science Foundation of China (NNSFC)[U1832153] ; National Natural Science Foundation of China (NNSFC)[11764045] ; National Natural Science Foundation of China (NNSFC)[11574319] ; National Natural Science Foundation of China (NNSFC)[11847054] ; Center of Science and Technology of Hefei Academy of Science[2016FXZY002] ; Applied Basic Research Foundation of Department of Science and Technology of Yunnan Province[2019FD134] ; Department of Education of Yunnan Province[2018JS010] ; Young Backbone Teachers Training Program of Yunnan University ; Department of Science and Technology of Yunnan Province
WOS关键词	CARBON
WOS研究方向	Physics
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000585807400004
资助机构	National Natural Science Foundation of China (NNSFC) ; Center of Science and Technology of Hefei Academy of Science ; Applied Basic Research Foundation of Department of Science and Technology of Yunnan Province ; Department of Education of Yunnan Province ; Young Backbone Teachers Training Program of Yunnan University ; Department of Science and Technology of Yunnan Province
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/105262]
专题	中国科学院合肥物质科学研究院
通讯作者	Xu, W.
作者单位	1.Univ Antwerp, Dept Phys, Groenenborgerlaan 171, B-2020 Antwerp, Belgium 2.Yunnan Univ, Yunnan Key Lab Quantum Informat, Kunming 650504, Yunnan, Peoples R China 3.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 4.Yunnan Univ, Sch Phys & Astron, Kunming 650504, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Li, Q. N.,Xu, W.,Xiao, Y. M.,et al. Optical absorption window in Na3Bi based three-dimensional Dirac electronic system[J]. JOURNAL OF APPLIED PHYSICS,2020,128.
APA	Li, Q. N.,Xu, W.,Xiao, Y. M.,Ding, L.,Van Duppen, B.,&Peeters, F. M..(2020).Optical absorption window in Na3Bi based three-dimensional Dirac electronic system.JOURNAL OF APPLIED PHYSICS,128.
MLA	Li, Q. N.,et al."Optical absorption window in Na3Bi based three-dimensional Dirac electronic system".JOURNAL OF APPLIED PHYSICS 128(2020).