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

Dendzik, Maciej Ramon; 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

doi:10.1103/PhysRevLett.125.096401

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

MPS-Authors

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Dendzik, Maciej Ramon
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Applied Physics, KTH Royal Institute of Technology;

/persons/resource/persons136124

Xian, R. Patrick
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons206871

Dong, Shuo
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons227651

Beaulieu, Samuel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons227631

Pincelli, Tommaso
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons213881

Hauer, Jasper
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22250

Wolf, Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons104701

Rettig, Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21497

Ernstorfer, Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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2003.12925.pdf
(Preprint), 9MB

PhysRevLett.125.096401.pdf
(Publisher version), 957KB

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Citation

Dendzik, M. R., Xian, R. P., Perfetto, E., Sangalli, D., Kutnyakhov, D., Dong, S., et al. (2020). Observation of an Excitonic Mott Transition through Ultrafast Core-cum-Conduction Photoemission Spectroscopy. Physical Review Letters, 125(09): 096401. doi:10.1103/PhysRevLett.125.096401.

Cite as: https://hdl.handle.net/21.11116/0000-0006-8E13-5

Abstract

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 WSe$_2$. 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 reveals a delayed core-hole renormalization due to
screening by excited quasi-free carriers, revealing an excitonic Mott
transition. These findings establish time-resolved core-level photoelectron
spectroscopy as a sensitive probe of subtle electronic many-body interactions
and an ultrafast electronic phase transition.