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

Junzhang Ma1,2,3*, Simin Nie4, Xin Gui5, Muntaser Naamneh2, Jasmin Jandke2, Chuanying Xi6, Jinglei Zhang6, Tian Shang7, Yimin Xiong6, Itzik Kapon8, Neeraj Kumar9, Yeong Soh9, Daniel Gosálbez-Martínez10, Oleg V. Yazyev10, Wenhui Fan11,12, Hannes Hübener13, Umberto De Giovannini13, Nicholas Clark Plumb2, Milan Radovic2, Michael Andreas Sentef13, Weiwei Xie14, Zhijun Wang11,12, Christopher Mudry10,15, Markus Müller15*, Ming Shi2*

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: junzhama@cityu.edu.hk, Markus.Mueller@psi.ch, ming.shi@psi.ch
DOI10.24435/materialscloud:sr-aa [version v1]

Publication date: Feb 11, 2022

How to cite this record

Junzhang Ma, Simin Nie, Xin Gui, Muntaser Naamneh, Jasmin Jandke, Chuanying Xi, Jinglei Zhang, Tian Shang, Yimin Xiong, Itzik Kapon, Neeraj Kumar, Yeong Soh, Daniel Gosálbez-Martínez, Oleg V. Yazyev, Wenhui Fan, Hannes Hübener, Umberto De Giovannini, Nicholas Clark Plumb, Milan Radovic, Michael Andreas Sentef, Weiwei Xie, Zhijun Wang, Christopher Mudry, Markus Müller, Ming Shi, Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe₃, Materials Cloud Archive 2022.26 (2022), doi: 10.24435/materialscloud:sr-aa.

Description

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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External references

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.)
J.-Z. Ma, et al. Nature Materials, in press (2022). doi:https://doi.org/10.1038/s41563-022-01201-9
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Keywords

Mobile excitons in metal 1D metallic trichalcogennide interchain excitons and trions Dispersive bands from excitons ARPES MARVEL/DD6

Version history:

2022.26 (version v1) [This version] Feb 11, 2022 DOI10.24435/materialscloud:sr-aa