학술논문
Observation of an excitonic Mott transition through ultrafast core-$\textit{cum}$-conduction photoemission spectroscopy
Document Type
Working Paper
Author
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
Source
Phys. Rev. Lett. 125, 096401 (2020)
Subject
Language
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.
Comment: 6 pages, 4 figures
Comment: 6 pages, 4 figures