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  Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3

Ma, J.-Z., Nie, S.-M., Gui, X., Naamneh, M., Jandke, J., Xi, C. Y., et al. (2022). Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3. Nature Materials, 21(4), 423-429. doi:10.1038/s41563-022-01201-9.

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Supplementary Information (pdf): I. Features of metallic TaSe3 that favour the observation of mobile bound states. II. Ruling out standard scenarios for replica bands. III. EDCs identifying SVBs and the polaronic QPs. IV. Doping dependence of ARPES spectra. V. Soft-X-ray ARPES spectra and bulk doping by W. VI. Mobile excitons in a 1D metal. VII. The effect of screening on a Q1D exciton problem. VIII. Doping dependence of 1D exciton characteristics. IX. Summary.
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 Creators:
Ma, J.-Z.1, Author
Nie, S.-M.1, Author
Gui, X.1, Author
Naamneh, M.1, Author
Jandke, J.1, Author
Xi, C. Y.1, Author
Zhang, J. L.1, Author
Shang, T.1, Author
Xiong, Y.M.1, Author
Kapon, I.1, Author
Kumar, N.1, Author
Soh, Y.1, Author
Gosalbezmartinez, D.1, Author
Yazyev, O.1, Author
Fan, W.H.1, Author
Plumb, N.1, Author
Radovic, M.1, Author
Hübener, H.2, Author           
de Giovannini, U.2, Author           
Sentef, M. A.3, Author           
Song, W.-W.1, AuthorWang, Z.1, AuthorMudry, C.1, AuthorMuller, M.1, AuthorShi, M.1, Author more..
Affiliations:
1external, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              

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 Abstract: Charge neutrality and their expected itinerant nature makes excitons potential transmitters of information. However, exciton mobility remains inaccessible to traditional optical experiments that only create and detect excitons with negligible momentum. Here, using angle-resolved photoemission spectroscopy, we detect dispersing excitons in the quasi-one-dimensional metallic trichalcogenide, TaSe3. The low density of conduction electrons and the low dimensionality in TaSe3 combined with a polaronic renormalization of the conduction band and the poorly screened interaction between these polarons and photo-induced valence holes leads to various excitonic bound states that we interpret as intrachain and interchain excitons, and possibly trions. The thresholds for the formation of a photo-hole together with an exciton appear as side valence bands with dispersions nearly parallel to the main valence band, but shifted to lower excitation energies. The energy separation between side and main valence bands can be controlled by surface doping, enabling the tuning of certain exciton properties.

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Language(s): eng - English
 Dates: 2020-09-222022-01-122022-02-212022-04
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2009.07157
DOI: 10.1038/s41563-022-01201-9
 Degree: -

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Project name : -
Grant ID : 701647
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

Source 1

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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 21 (4) Sequence Number: - Start / End Page: 423 - 429 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000