Oleg V. Yazyev10,
Umberto De Giovannini13,
Nicholas Clark Plumb2,
Michael Andreas Sentef13,
1 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China
2 Photon Science Division, Paul Scherrer Institute, Villigen, Switzerland
3 City University of Hong Kong Shenzhen Research Institute, Shenzhen, China
4 Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
5 Department of Chemistry, Princeton University, Princeton, NJ, USA
6 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, CAS
7 Key Laboratory of Polar Materials and Devices, School of Physics and Electronic Science, East China Normal University, Shanghai, China
8 Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
9 Paul Scherrer Institute, Villigen, Switzerland
10 Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
11 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
12 University of Chinese Academy of Sciences, Beijing, China
13 Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
14 Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, USA
15 Condensed Matter Theory Group, Paul Scherrer Institute, Villigen, Switzerland
* Corresponding authors emails:
How to cite this record
Oleg V. Yazyev,
Umberto De Giovannini,
Nicholas Clark Plumb,
Michael Andreas Sentef,
Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe₃
, Materials Cloud Archive
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 quasi-one-dimensional metallic trichalcogenide, TaSe₃. The low density of conduction electrons and 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. This document contains the raw data of this project.
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Journal reference (The paper is accepted by Nature materials, and now is in press. If the DOI is not valid, please be patient to wait till the publication soon.)
Mobile excitons in metal
1D metallic trichalcogennide
interchain excitons and trions
Dispersive bands from excitons