TY - JOUR
T1 - Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3
AU - Ma, Junzhang
AU - Nie, Simin
AU - Gui, Xin
AU - Naamneh, Muntaser
AU - Jandke, Jasmin
AU - Xi, Chuanying
AU - Zhang, Jinglei
AU - Shang, Tian
AU - Xiong, Yimin
AU - Kapon, Itzik
AU - Kumar, Neeraj
AU - Soh, Yona
AU - Gosálbez-Martínez, Daniel
AU - Yazyev, Oleg V.
AU - Fan, Wenhui
AU - Hübener, Hannes
AU - Giovannini, Umberto De
AU - Plumb, Nicholas Clark
AU - Radovic, Milan
AU - Sentef, Michael Andreas
AU - Xie, Weiwei
AU - Wang, Zhijun
AU - Mudry, Christopher
AU - Müller, Markus
AU - Shi, Ming
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Limited.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85124981713&partnerID=8YFLogxK
U2 - 10.1038/s41563-022-01201-9
DO - 10.1038/s41563-022-01201-9
M3 - Article
C2 - 35190656
AN - SCOPUS:85124981713
SN - 1476-1122
VL - 21
SP - 423
EP - 429
JO - Nature Materials
JF - Nature Materials
IS - 4
ER -