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arXiv 2002.009392020-02-03cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sci

Can 1D topological states explain the extraordinary thermoelectric properties of Bi 2 Te 3 ? An exact analytical solution in the Tomonaga-Luttinger liquids (TLLs) framework

P. Chudzinski

发表信息：: Proc.Roy.Soc.A (June 2020)

英文摘要：

Topological insulators are frequently also one of the best known thermoelectric materials. It has been recently discovered that in 3D topological insulators each skew dislocation can host a pair of 1D topological states a helical TLL. We derive exact analytical formulas for thermoelectric Seebeck coefficient in TLL and investigate up to what extent one can ascribe the outstanding thermoelectric properties of Bi 2 Te 3 to these 1D topological states. To this end we take a model of a dense dislocation network and find an analytic formula for an overlap between 1D (the TLL) and 3D electronic states. Our study is applicable to a weakly n-doped Bi 2 Te 3 but also to a broader class of nano-structured materials with artificially created 1D systems. Furthermore, our results can be used at finite frequency settings e.g. to capture transport activated by photo-excitations.

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