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

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 tr...

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Bibliographic Details
Published in:Physical review letters 2020-08, Vol.125 (9), p.1-096401, Article 096401
Main Authors: 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
Format: Article
Language:English
Subjects:
Electrons
Excitation
Excitation spectra
Excitons
Green's functions
Many body interactions
Phase transitions
Photoelectric emission
Photoelectron spectroscopy
Photoelectrons
Spectrum analysis
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Summary: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.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.125.096401