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Article: Structural phase transition in monolayer MoTe2 driven by electrostatic doping

TitleStructural phase transition in monolayer MoTe2 driven by electrostatic doping
Authors
Issue Date2017
PublisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/nature
Citation
Nature, 2017, v. 550 n. 7677, p. 487-491 How to Cite?
AbstractMonolayers of transition-metal dichalcogenides (TMDs) exhibit numerous crystal phases with distinct structures, symmetries and physical properties. Exploring the physics of transitions between these different structural phases in two dimensions may provide a means of switching material properties, with implications for potential applications. Structural phase transitions in TMDs have so far been induced by thermal or chemical means; purely electrostatic control over crystal phases through electrostatic doping was recently proposed as a theoretical possibility, but has not yet been realized. Here we report the experimental demonstration of an electrostatic-doping-driven phase transition between the hexagonal and monoclinic phases of monolayer molybdenum ditelluride (MoTe 2). We find that the phase transition shows a hysteretic loop in Raman spectra, and can be reversed by increasing or decreasing the gate voltage. We also combine second-harmonic generation spectroscopy with polarization-resolved Raman spectroscopy to show that the induced monoclinic phase preserves the crystal orientation of the original hexagonal phase. Moreover, this structural phase transition occurs simultaneously across the whole sample. This electrostatic-doping control of structural phase transition opens up new possibilities for developing phase-change devices based on atomically thin membranes. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/257377
ISSN
2020 Impact Factor: 49.962
2015 SCImago Journal Rankings: 21.936
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, Y-
dc.contributor.authorXiao, J-
dc.contributor.authorZhu, H-
dc.contributor.authorLi, Y-
dc.contributor.authorAlsaid, Y-
dc.contributor.authorFong, KY-
dc.contributor.authorZhou, Y-
dc.contributor.authorWang, S-
dc.contributor.authorShi, W-
dc.contributor.authorWang, Y-
dc.contributor.authorZettl, A-
dc.contributor.authorReed, EJ-
dc.contributor.authorZhang, X-
dc.date.accessioned2018-07-30T01:37:26Z-
dc.date.available2018-07-30T01:37:26Z-
dc.date.issued2017-
dc.identifier.citationNature, 2017, v. 550 n. 7677, p. 487-491-
dc.identifier.issn0028-0836-
dc.identifier.urihttp://hdl.handle.net/10722/257377-
dc.description.abstractMonolayers of transition-metal dichalcogenides (TMDs) exhibit numerous crystal phases with distinct structures, symmetries and physical properties. Exploring the physics of transitions between these different structural phases in two dimensions may provide a means of switching material properties, with implications for potential applications. Structural phase transitions in TMDs have so far been induced by thermal or chemical means; purely electrostatic control over crystal phases through electrostatic doping was recently proposed as a theoretical possibility, but has not yet been realized. Here we report the experimental demonstration of an electrostatic-doping-driven phase transition between the hexagonal and monoclinic phases of monolayer molybdenum ditelluride (MoTe 2). We find that the phase transition shows a hysteretic loop in Raman spectra, and can be reversed by increasing or decreasing the gate voltage. We also combine second-harmonic generation spectroscopy with polarization-resolved Raman spectroscopy to show that the induced monoclinic phase preserves the crystal orientation of the original hexagonal phase. Moreover, this structural phase transition occurs simultaneously across the whole sample. This electrostatic-doping control of structural phase transition opens up new possibilities for developing phase-change devices based on atomically thin membranes. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.-
dc.languageeng-
dc.publisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/nature-
dc.relation.ispartofNature-
dc.titleStructural phase transition in monolayer MoTe2 driven by electrostatic doping-
dc.typeArticle-
dc.identifier.emailZhang, X: president@hku.hk-
dc.identifier.authorityZhang, X=rp02411-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/nature24043-
dc.identifier.scopuseid_2-s2.0-85032451955-
dc.identifier.volume550-
dc.identifier.issue7677-
dc.identifier.spage487-
dc.identifier.epage491-
dc.identifier.isiWOS:000413697800036-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0028-0836-

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