6533b872fe1ef96bd12d38ef
RESEARCH PRODUCT
Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3
Junzhang MaSimin NieXin GuiMuntaser NaamnehJasmin JandkeChuanying XiJinglei ZhangTian ShangYimin XiongItzik KaponNeeraj KumarYona SohDaniel Gosálbez-martínezOleg V. YazyevWenhui FanHannes HübenerUmberto De GiovanniniNicholas Clark PlumbMilan RadovicMichael Andreas SentefWeiwei XieZhijun WangChristopher MudryMarkus MüllerMing Shisubject
Condensed Matter::Quantum Gasescharge-density-waveStrongly Correlated Electrons (cond-mat.str-el)tr-ARPESCondensed Matter::OtherMechanical EngineeringsuperconductivityFOS: Physical sciencestransitionGeneral ChemistryCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectSettore FIS/03 - Fisica Della MateriaCondensed Matter - Strongly Correlated ElectronsCondensed Matter::Materials ScienceMechanics of MaterialsGeneral Materials ScienceCondensed Matter::Strongly Correlated ElectronsPolarondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-15 |