Topological Anderson Insulator in cation-disordered Cu2ZnSnS4

Autor:	Mukherjee, Binayak, Isotta, Eleonora, Ataollahi, Narges, Scardi, Paolo
Rok vydání:	2021
Předmět:	Condensed Matter - Materials Science Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
Popis:	Abstract: Using ab initio calculations supported by experimental transport measurements, we present the first credible candidate for the realization of a disorder-induced Topological Anderson Insulator in a real material system. High energy reactive ball-milling produces a polymorph of Cu2ZnSnS4 with high cation disorder, which shows an inverted ordering of bands at the Brillouin zone center, in contrast to its ordered phase. Adiabatic continuity arguments establish that this disordered Cu2ZnSnS4 can be connected to the closely related Cu2ZnSnSe4, previously predicted to be a 3D topological insulator. Band structure calculations with a slab geometry reveal the presence of robust surface states, while impedance spectroscopy coupled with resistivity measurements point to the surface-dominated transport which such states would imply; thus making a strong case in favor of a novel topological phase. As such, this study opens up a window to understanding and potentially exploiting topological behavior in a rich class of easily-synthesized multinary, disordered compounds. Comment: Correspondence: P.S. (paolo.scardi@unitn.it), B.M. (binayak.mukherjee@unitn.it)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2106.14714 Zobrazit plný text záznamu View this record from Arxiv