Temperature, strain and charge mediated multiple and dynamical phase changes of selenium and tellurium

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buir.contributor.authorDemirci, Salih
buir.contributor.authorJahangirov, Seymur
buir.contributor.authorÇıracı, Salim
buir.contributor.orcidÇıracı, Salim|0000-0001-8023-9860
dc.citation.epage3258en_US
dc.citation.issueNumber5en_US
dc.citation.spage3249en_US
dc.citation.volumeNumber12en_US
dc.contributor.authorDemirci, Salih
dc.contributor.authorGürel, H. H.
dc.contributor.authorJahangirov, Seymur
dc.contributor.authorÇıracı, Salim
dc.date.accessioned2021-03-03T12:55:54Z
dc.date.available2021-03-03T12:55:54Z
dc.date.issued2020
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractSemiconducting selenium and tellurium in their 3D bulk trigonal structures consist of parallel and weakly interacting helical chains of atoms and display a number of peculiarities. We predict that thermal excitations, 2D compressive strain and excess charge of positive and negative polarity mediate metal–insulator transitions by transforming these semiconductors into different metallic crystal structures. When heated to high temperature, or compressed, or charged positively, they change into a simple cubic structure with metallic bands, which is very rare among elemental crystals. When charged negatively, they transform first into body-centered tetragonal and subsequently into the body-centered orthorhombic structures with increasing negative charging. These two new structures stabilized by excess electrons also have overlapping metallic bands and quasi 2D and 1D substructures of lower dimensionality. Since the external charging of crystals can be achieved through their surfaces, the effects of charging on 2D structures of selenium and tellurium are also investigated. Similar structural transformations have been mediated also in 2D nanosheets and free-standing monolayers of these elements. These phase changes assisted by phonons are dynamical, reversible and tunable; the resulting metal–insulator transitions can occur within very short time intervals and may offer important device applications.en_US
dc.identifier.doi10.1039/c9nr06069cen_US
dc.identifier.issn2040-3364
dc.identifier.urihttp://hdl.handle.net/11693/75725
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://dx.doi.org/10.1039/c9nr06069cen_US
dc.source.titleNanoscaleen_US
dc.titleTemperature, strain and charge mediated multiple and dynamical phase changes of selenium and telluriumen_US
dc.typeArticleen_US
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Institute of Materials Science and Nanotechnology (UNAM)