Franckeite as an Exfoliable Naturally Occurring Topological Insulator,Nano Letters

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Franckeite as an Exfoliable Naturally Occurring Topological Insulator
Nano Letters ( IF 9.6 ) Pub Date : 2021-08-30 , DOI: 10.1021/acs.nanolett.1c02742
Wendel S Paz _{1,

2} , Marcos G Menezes ₂ , Nathanael N Batista _{1,

3} , Gabriel Sanchez-Santolino ₄ , Matěj Velický ₅ , María Varela ₄ , Rodrigo B Capaz ₂ , Juan José Palacios ₆

Affiliation

Franckeite is a natural superlattice composed of two alternating layers of different composition which has shown potential for optoelectronic applications. In part, the interest in franckeite lies in its layered nature which makes it easy to exfoliate into very thin heterostructures. Not surprisingly, its chemical composition and lattice structure are so complex that franckeite has escaped screening protocols and high-throughput searches of materials with nontrivial topological properties. On the basis of density functional theory calculations, we predict a quantum phase transition originating from stoichiometric changes in one of franckeite composing layers (the quasihexagonal one). While for a large concentration of Sb, franckeite is a sequence of type-II semiconductor heterojunctions, for a large concentration of Sn, these turn into type-III, much alike InAs/GaSb artificial heterojunctions, and franckeite becomes a strong topological insulator. Transmission electron microscopy observations confirm that such a phase transition may actually occur in nature.

中文翻译：

Franckeite 作为可剥落的天然拓扑绝缘体

Franckeite 是一种天然超晶格，由两个不同成分的交替层组成，已显示出光电应用的潜力。在某种程度上，对方铅矿的兴趣在于它的分层性质，这使得它很容易剥落成非常薄的异质结构。毫不奇怪，它的化学成分和晶格结构非常复杂，以至于法兰克石已经逃脱了筛选协议和对具有重要拓扑特性的材料的高通量搜索。在密度泛函理论计算的基础上，我们预测了一种量子相变，该相变源于其中一个法兰克石组成层（准六边形层）的化学计量变化。而对于高浓度的 Sb，方铅矿是一系列 II 型半导体异质结，对于高浓度的 Sn，这些变成 III 型，与 InAs/GaSb 人工异质结非常相似，并且方铅矿成为强拓扑绝缘体。透射电子显微镜观察证实，这种相变实际上可能发生在自然界中。

更新日期：2021-09-22

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