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Title: Topological states and phase transitions in Sb2Te3-GeTe multilayers
Authors: Nguyen, Thuy-Anh
Backes, Dirk
Singh, Angadjit
Mansell, Rhodri
Barnes, Crispin
Ritchie, David A.
Mussler, Gregor
Lanius, Martin
Grutzmacher, Detlev
Narayan, Vijay
Keywords: Phase transitions and critical phenomena
Topological insulators
Issue Date: 2016
Publisher: Nature
Citation: NGUYEN, T.-A. ... et al, 2016. Topological states and phase transitions in Sb2Te3-GeTe multilayers. Scientific Reports, 6, 27716.
Abstract: Topological insulators (TIs) are bulk insulators with exotic ‘topologically protected’ surface conducting modes. It has recently been pointed out that when stacked together, interactions between surface modes can induce diverse phases including the TI, Dirac semimetal, and Weyl semimetal. However, currently a full experimental understanding of the conditions under which topological modes interact is lacking. Here, working with multilayers of the TI Sb2Te3 and the band insulator GeTe, we provide experimental evidence of multiple topological modes in a single Sb2Te3-GeTe-Sb2Te3 structure. Furthermore, we show that reducing the thickness of the GeTe layer induces a phase transition from a Dirac-like phase to a gapped phase. By comparing different multilayer structures we demonstrate that this transition occurs due to the hybridisation of states associated with different TI films. Our results demonstrate that the Sb2Te3-GeTe system offers strong potential towards manipulating topological states as well as towards controlledly inducing various topological phases.
Description: This is an Open Access Article. It is published by Nature under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at http://creativecommons.org/licenses/by/4.0/
Sponsor: Leverhulme Trust, EPSRC (UK), DFG-funded priority programme SPP1666.
Version: Published
DOI: 10.1038/srep27716
URI: https://dspace.lboro.ac.uk/2134/22922
Publisher Link: http://dx.doi.org/10.1038/srep27716
Appears in Collections:Published Articles (Physics)

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