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Thermoelectric transport in temperature-driven two-dimensional topological insulators
Dong, H. M.1; Li, L. L.2; Xu, W.2,3; Liu, J. L.4
2017-08-08
发表期刊SCIENTIFIC REPORTS
卷号7
摘要We theoretically investigate on the thermoelectric (TE) transport properties of edge and bulk states in a temperature-driven two-dimensional (2D) topological insulator (TI) realized from CdTe/HgTe/CdTe quantum wells (QWs). It is found that the temperature can effectively drive a TI phase in CdTe/HgTe/CdTe QWs. We find that the TE transport properties of 2D TI can be governed by edge states, bulk states, or their interplay, depending on driving temperature and chemical potential of the system. Moreover, we find that the TE figure of merit ZT shows a peak at relatively low temperatures due to the competition between bulk and edge transports. This peak vanishes at relatively high temperatures due to the dominance of bulk states in the TE transport. With decreasing the ribbon width of the temperature-driven 2D TI, the low-temperature ZT exhibits two peaks, among which one occurs due to the bulk-edge competition and the other occurs due to the edge-edge hybridization; while the high-temperature ZT first exhibits the bulk-state behavior and then the edge-state one, which is indicative of a bulk-to-edge transition in the TE transport.
文章类型Article
WOS标题词Science & Technology
资助者National Natural Science Foundation of China(11304316 ; National Natural Science Foundation of China(11304316 ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; 11604380) ; 11604380) ; National Natural Science Foundation of China(11304316 ; National Natural Science Foundation of China(11304316 ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; 11604380) ; 11604380)
DOI10.1038/s41598-017-08084-w
关键词[WOS]HGTE QUANTUM-WELLS ; ENERGY-GAP ; ALLOY COMPOSITION ; HG1-XCDXTE ; DEPENDENCE ; STATE ; PHASE
收录类别SCI
语种英语
资助者National Natural Science Foundation of China(11304316 ; National Natural Science Foundation of China(11304316 ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; 11604380) ; 11604380) ; National Natural Science Foundation of China(11304316 ; National Natural Science Foundation of China(11304316 ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; Fundamental Research Funds for the Central Universities(2015XKMS077) ; 11604380) ; 11604380)
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000407180400018
引用统计
文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/33591
专题中科院固体物理研究所
作者单位1.China Univ Min & Technol, Sch Phys, Xuzhou 221116, Peoples R China
2.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China
3.Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China
4.China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Peoples R China
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GB/T 7714
Dong, H. M.,Li, L. L.,Xu, W.,et al. Thermoelectric transport in temperature-driven two-dimensional topological insulators[J]. SCIENTIFIC REPORTS,2017,7.
APA Dong, H. M.,Li, L. L.,Xu, W.,&Liu, J. L..(2017).Thermoelectric transport in temperature-driven two-dimensional topological insulators.SCIENTIFIC REPORTS,7.
MLA Dong, H. M.,et al."Thermoelectric transport in temperature-driven two-dimensional topological insulators".SCIENTIFIC REPORTS 7(2017).
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