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Journal Article

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;

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

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

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

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

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

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

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

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

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Fulltext (public)

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.