Thermoelectric transport in temperature-driven two-dimensional topological insulators

Abstract 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...

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Autores principales:	H. M. Dong, L. L. Li, W. Xu, J. L. Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a065085690e34b088e9265372c5230a5
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spelling	oai:doaj.org-article:a065085690e34b088e9265372c5230a52021-12-02T12:32:32ZThermoelectric transport in temperature-driven two-dimensional topological insulators10.1038/s41598-017-08084-w2045-2322https://doaj.org/article/a065085690e34b088e9265372c5230a52017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08084-whttps://doaj.org/toc/2045-2322Abstract 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.H. M. DongL. L. LiW. XuJ. L. LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q H. M. Dong L. L. Li W. Xu J. L. Liu Thermoelectric transport in temperature-driven two-dimensional topological insulators
description	Abstract 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.
format	article
author	H. M. Dong L. L. Li W. Xu J. L. Liu
author_facet	H. M. Dong L. L. Li W. Xu J. L. Liu
author_sort	H. M. Dong
title	Thermoelectric transport in temperature-driven two-dimensional topological insulators
title_short	Thermoelectric transport in temperature-driven two-dimensional topological insulators
title_full	Thermoelectric transport in temperature-driven two-dimensional topological insulators
title_fullStr	Thermoelectric transport in temperature-driven two-dimensional topological insulators
title_full_unstemmed	Thermoelectric transport in temperature-driven two-dimensional topological insulators
title_sort	thermoelectric transport in temperature-driven two-dimensional topological insulators
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/a065085690e34b088e9265372c5230a5
work_keys_str_mv	AT hmdong thermoelectrictransportintemperaturedriventwodimensionaltopologicalinsulators AT llli thermoelectrictransportintemperaturedriventwodimensionaltopologicalinsulators AT wxu thermoelectrictransportintemperaturedriventwodimensionaltopologicalinsulators AT jlliu thermoelectrictransportintemperaturedriventwodimensionaltopologicalinsulators
_version_	1718394051812655104

Thermoelectric transport in temperature-driven two-dimensional topological insulators

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