Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator

Abstract We investigate the thermoelectric effect on a topological insulator surface with particular interest in impurity-induced resonant states. To clarify the role of the resonant states, we calculate the dc and ac conductivities and the thermoelectric coefficients along the longitudinal directio...

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Autores principales:	Min Zhong, Shuai Li, Hou-Jian Duan, Liang-Bin Hu, Mou Yang, Rui-Qiang Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/17429f212c9b478f82d3efeca153b12e
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spelling	oai:doaj.org-article:17429f212c9b478f82d3efeca153b12e2021-12-02T11:40:14ZEffect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator10.1038/s41598-017-04360-x2045-2322https://doaj.org/article/17429f212c9b478f82d3efeca153b12e2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04360-xhttps://doaj.org/toc/2045-2322Abstract We investigate the thermoelectric effect on a topological insulator surface with particular interest in impurity-induced resonant states. To clarify the role of the resonant states, we calculate the dc and ac conductivities and the thermoelectric coefficients along the longitudinal direction within the full Born approximation. It is found that at low temperatures, the impurity resonant state with strong energy de-pendence can lead to a zero-energy peak in the dc conductivity, whose height is sensitively dependent on the strength of scattering potential, and even can reverse the sign of the thermopower, implying the switching from n- to p-type carriers. Also, we exhibit the thermoelectric signatures for the filling process of a magnetic band gap by the resonant state. We further study the impurity effect on the dynamic optical conductivity, and find that the resonant state also generates an optical conductivity peak at the absorption edge for the interband transition. These results provide new perspectives for understanding the doping effect on topological insulator materials.Min ZhongShuai LiHou-Jian DuanLiang-Bin HuMou YangRui-Qiang WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Min Zhong Shuai Li Hou-Jian Duan Liang-Bin Hu Mou Yang Rui-Qiang Wang Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
description	Abstract We investigate the thermoelectric effect on a topological insulator surface with particular interest in impurity-induced resonant states. To clarify the role of the resonant states, we calculate the dc and ac conductivities and the thermoelectric coefficients along the longitudinal direction within the full Born approximation. It is found that at low temperatures, the impurity resonant state with strong energy de-pendence can lead to a zero-energy peak in the dc conductivity, whose height is sensitively dependent on the strength of scattering potential, and even can reverse the sign of the thermopower, implying the switching from n- to p-type carriers. Also, we exhibit the thermoelectric signatures for the filling process of a magnetic band gap by the resonant state. We further study the impurity effect on the dynamic optical conductivity, and find that the resonant state also generates an optical conductivity peak at the absorption edge for the interband transition. These results provide new perspectives for understanding the doping effect on topological insulator materials.
format	article
author	Min Zhong Shuai Li Hou-Jian Duan Liang-Bin Hu Mou Yang Rui-Qiang Wang
author_facet	Min Zhong Shuai Li Hou-Jian Duan Liang-Bin Hu Mou Yang Rui-Qiang Wang
author_sort	Min Zhong
title	Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
title_short	Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
title_full	Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
title_fullStr	Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
title_full_unstemmed	Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
title_sort	effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/17429f212c9b478f82d3efeca153b12e
work_keys_str_mv	AT minzhong effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator AT shuaili effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator AT houjianduan effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator AT liangbinhu effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator AT mouyang effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator AT ruiqiangwang effectofimpurityresonantstatesonopticalandthermoelectricpropertiesonthesurfaceofatopologicalinsulator
_version_	1718395625555361792

Effect of impurity resonant states on optical and thermoelectric properties on the surface of a topological insulator

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