6533b7dbfe1ef96bd1271658
RESEARCH PRODUCT
Observation of an excitonic Mott transition through ultrafast core-cum-conduction photoemission spectroscopy
Samuel BeaulieuGianluca StefanucciMichael HeberAndrea MariniJasper HauerWilfried WurthMartin WolfEnrico PerfettoYves AcremannMaciej DendzikMaciej DendzikGünter BrennerTommaso PincelliRalph ErnstorferPhilip HofmannDavide SangalliShuo DongSteinn Ymir AgustssonLaurenz RettigDavide CurcioR. Patrick XianD. KutnyakhovFederico Pressaccosubject
Time ResolvedPhase transitionMaterials sciencePhotoemission spectroscopyExcitonFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciencesMolecular physicsCondensed Matter - Strongly Correlated ElectronsCore PhysicsX-ray photoelectron spectroscopyMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesddc:530010306 general physicsNon-equilibriumCondensed Matter - Materials ScienceSettore FIS/03Strongly Correlated Electrons (cond-mat.str-el)Condensed Matter - Mesoscale and Nanoscale PhysicsMaterials Science (cond-mat.mtrl-sci)3. Good healthMott transitionExcited stateMany-BodyUltrashort pulseExcitationdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-08-28 |