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  The spontaneous symmetry breaking in Ta2NiSe5 is structural in nature

Baldini, E., Zong, A., Choi, D., Lee, C., Michael, M. H., Windgätter, L., et al. (2020). The spontaneous symmetry breaking in Ta2NiSe5 is structural in nature.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-325B-B Version Permalink: http://hdl.handle.net/21.11116/0000-0007-325C-A
Genre: Paper

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2007.02909.pdf (Preprint), 10MB
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2007.02909.pdf
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https://arxiv.org/abs/2007.02909 (Preprint)
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 Creators:
Baldini, E.1, Author
Zong, A.1, Author
Choi, D.2, Author
Lee, C.1, Author
Michael, M. H.3, Author
Windgätter, L.4, Author              
Mazin, I. I.5, Author
Latini, S.4, Author              
Azoury, D.1, Author
Lv, B.1, Author
Kogar, A.1, Author
Wang, Y.3, Author
Lu, Y.6, Author
Takayama, T.6, 7, Author
Takagi, H.6, 7, Author
Millis, A. J.8, 9, Author
Rubio, A.4, 9, 10, Author              
Demler, E.3, Author
Gedik, N.1, Author
Affiliations:
1Department of Physics, Massachusetts Institute of Technology, ou_persistent22              
2Department of Electrical Engineering & Computer Science, Massachusetts Institute of Technology, ou_persistent22              
3Department of Physics, Harvard University, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Department of Physics and Astronomy and Center for Quantum Materials, George Mason University, ou_persistent22              
6Department of Physics, University of Tokyo, ou_persistent22              
7Max Planck Institute for Solid State Research, ou_persistent22              
8Department of Physics, Columbia University, New York, ou_persistent22              
9Center for Computational Quantum Physics, The Flatiron Institute, ou_persistent22              
10Nano-Bio Spectroscopy Group, Departamento de Física de Materiales, Universidad del País Vasco, ou_persistent22              

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 Abstract: The excitonic insulator is an electronically-driven phase of matter that emerges upon the spontaneous formation and Bose condensation of excitons. Detecting this exotic order in candidate materials is a subject of paramount importance, as the size of the excitonic gap in the band structure establishes the potential of this collective state for superfluid energy transport. However, the identification of this phase in real solids is hindered by the coexistence of a structural order parameter with the same symmetry as the excitonic order. Only a few materials are currently believed to host a dominant excitonic phase, Ta2NiSe5 being the most promising. Here, we test this scenario by using an ultrashort laser pulse to quench the broken-symmetry phase of this transition metal chalcogenide. Tracking the dynamics of the material's electronic and crystal structure after light excitation reveals surprising spectroscopic fingerprints that are only compatible with a primary order parameter of phononic nature. We rationalize our findings through state-of-the-art calculations, confirming that the structural order accounts for most of the electronic gap opening. Not only do our results uncover the long-sought mechanism driving the phase transition of Ta2NiSe5, but they also conclusively rule out any substantial excitonic character in this instability.

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Language(s): eng - English
 Dates: 2020-07-06
 Publication Status: Published online
 Pages: 26
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2007.02909
 Degree: -

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