Files in this item
Coherent order parameter oscillations in the ground state of the excitonic insulator Ta2NiSe5
Item metadata
dc.contributor.author | Werdehausen, Daniel | |
dc.contributor.author | Takayama, Tomohiro | |
dc.contributor.author | Höppner, Marc | |
dc.contributor.author | Albrecht, Gelon | |
dc.contributor.author | Rost, Andreas W. | |
dc.contributor.author | Lu, Yangfan | |
dc.contributor.author | Manske, Dirk | |
dc.contributor.author | Takagi, Hidenori | |
dc.contributor.author | Kaiser, Stefan | |
dc.date.accessioned | 2018-04-04T10:30:14Z | |
dc.date.available | 2018-04-04T10:30:14Z | |
dc.date.issued | 2018-03-23 | |
dc.identifier.citation | Werdehausen , D , Takayama , T , Höppner , M , Albrecht , G , Rost , A W , Lu , Y , Manske , D , Takagi , H & Kaiser , S 2018 , ' Coherent order parameter oscillations in the ground state of the excitonic insulator Ta 2 NiSe 5 ' , Science Advances , vol. 4 , no. 3 , eaap8652 . https://doi.org/10.1126/sciadv.aap8652 | en |
dc.identifier.issn | 2375-2548 | |
dc.identifier.other | PURE: 252727473 | |
dc.identifier.other | PURE UUID: ef56246c-0ef8-4a65-89ac-ad4f3d78997a | |
dc.identifier.other | Scopus: 85044437006 | |
dc.identifier.other | WOS: 000431373300016 | |
dc.identifier.uri | https://hdl.handle.net/10023/13068 | |
dc.description | S.K. acknowledges support by the Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg through the Juniorprofessuren-Programm and a fellowship by the Daimler und Benz Stiftung. | en |
dc.description.abstract | The excitonic insulator is an intriguing electronic phase of condensed excitons. A prominent candidate is the small bandgap semiconductor Ta2NiSe5, in which excitons are believed to undergo a Bose-Einstein condensation-like transition. However, direct experimental evidence for the existence of a coherent condensate in this material is still missing. A direct fingerprint of such a state would be the observation of its collective modes, which are equivalent to the Higgs and Goldstone modes in superconductors. We report evidence for the existence of a coherent amplitude response in the excitonic insulator phase of Ta2NiSe5. Using nonlinear excitations with short laser pulses, we identify a phonon-coupled state of the condensate that can be understood as a novel amplitudemode. The condensate density contribution substantiates the picture of an electronically driven phase transition and characterizes the transient order parameter of the excitonic insulator as a function of temperature and excitation density. | |
dc.format.extent | 7 | |
dc.language.iso | eng | |
dc.relation.ispartof | Science Advances | en |
dc.rights | Copyright © 2018 The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. | en |
dc.subject | QC Physics | en |
dc.subject | NDAS | en |
dc.subject.lcc | QC | en |
dc.title | Coherent order parameter oscillations in the ground state of the excitonic insulator Ta2NiSe5 | en |
dc.type | Journal article | en |
dc.description.version | Publisher PDF | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.identifier.doi | https://doi.org/10.1126/sciadv.aap8652 | |
dc.description.status | Peer reviewed | en |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.