Details

Autor(en) / Beteiligte

• Dendzik, Maciej
• Xian, R. Patrick
• Perfetto, Enrico
• Sangalli, Davide
• Kutnyakhov, Dmytro
• Dong, Shuo
• Beaulieu, Samuel
• Pincelli, Tommaso
• Pressacco, Federico
• Curcio, Davide
• Agustsson, Steinn Ymir
• Heber, Michael
• Hauer, Jasper
• Wurth, Wilfried
• Brenner, Günter
• Acremann, Yves
• Hofmann, Philip
• Wolf, Martin
• Marini, Andrea
• Stefanucci, Gianluca
• Rettig, Laurenz
• Ernstorfer, Ralph

Titel

Observation of an Excitonic Mott Transition Through Ultrafast Core- cum -Conduction Photoemission Spectroscopy

Ist Teil von

• Physical review letters, 2020-08, Vol.125 (9), p.1-096401, Article 096401

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

PROLA

Beschreibungen/Notizen

• Time-resolved soft-x-ray photoemission spectroscopy is used to simultaneously measure the ultrafast dynamics of core-level spectral functions and excited states upon excitation of excitons in WSe2. We present a many-body approximation for the Green's function, which excellently describes the transient core-hole spectral function. The relative dynamics of excited-state signal and core levels clearly show a delayed core-hole renormalization due to screening by excited quasifree carriers resulting from an excitonic Mott transition. These findings establish time-resolved core-level photoelectron spectroscopy as a sensitive probe of subtle electronic many-body interactions and ultrafast electronic phase transitions.