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Naslov:Dissecting Mott and charge-density wave dynamics in the photoinduced phase of 1T-TaS[sub]2
Avtorji:ID Simoncig, Alberto (Avtor)
ID Stupar, Matija (Avtor)
ID Ressel, Barbara (Avtor)
ID Saha, Tanusree (Avtor)
ID Rebernik Ribič, Primož (Avtor)
ID De Ninno, Giovanni (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:The two-dimensional transition-metal dichalcogenide 1T−TaS2 is a complex material standing out for its puzzling low temperature phase marked by signatures amenable to both Mott-insulating and charge-density wave states. Electronic Mott states, coupled to a lattice, respond to coherent optical excitations via a modulation of the lower (valence) Hubbard band. Such dynamics is driven by strong electron-phonon coupling and typically lasts for tens of picoseconds, mimicking coherent structural distortions. Instead, the response occurring at the much faster timescale, mainly dominated by electronic many-body effects, is still a matter of intense research. By performing time- and angle-resolved photoemission spectroscopy, we investigated the photoinduced phase of 1T−TaS2 and found out that its lower Hubbard band promptly reacts to coherent optical excitations by shifting its binding energy towards a slightly larger value. This process lasts for a time comparable to the optical pump pulse length, mirroring a transient change of the onsite Coulomb repulsion energy (U). Such an observation suggests that the correction to the bare value of U, ascribed to the phonon-mediated screening which slightly opposes the Hubbard repulsion, is lost within an interval of a few tens of femtoseconds and can be understood as a fingerprint of electronic states largely decoupled from the lattice. Additionally, these results enforce the hypothesis, envisaged in the current literature, that the transient photoinduced states belong to a sort of crossover phase instead of an equilibrium metallic one.
Ključne besede:ultrafast phenomena, time resolved photoemission, strongly correlated systems, transition metal dichalcogenide
Leto izida:2021
Št. strani:str. 1-7
Številčenje:Vol. 103, iss. 5
PID:20.500.12556/RUNG-6471 Novo okno
COBISS.SI-ID:59328771 Novo okno
UDK:53
ISSN pri članku:2469-9950
DOI:10.1103/PhysRevB.103.155120 Novo okno
NUK URN:URN:SI:UNG:REP:OCCSHWAX
Datum objave v RUNG:13.04.2021
Število ogledov:3935
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
SIMONCIG, Alberto, STUPAR, Matija, RESSEL, Barbara, SAHA, Tanusree, REBERNIK RIBIČ, Primož in DE NINNO, Giovanni, 2021, Dissecting Mott and charge-density wave dynamics in the photoinduced phase of 1T-TaS[sub]2. Physical review [na spletu]. 2021. Vol. 103, no. 5, p. 1–7. [Dostopano 7 april 2025]. DOI 10.1103/PhysRevB.103.155120. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=6471
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Gradivo je del revije

Naslov:Physical review
Založnik:American Physical Society
ISSN:2469-9950
COBISS.SI-ID:2997348 Novo okno

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