Ultrafast doublon dynamics in photo-excited 1T-TaS2Show others and affiliations
2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 16, article id 166401Article in journal (Refereed) Published
Abstract [en]
Strongly correlated materials exhibit intriguing properties caused by intertwined microscopic interactions that are hard to disentangle in equilibrium. Employing nonequilibrium time-resolved photoemission spectroscopy on the quasi-two-dimensional transition-metal dichalcogenide 1T-TaS2, we identify a spectroscopic signature of doubly occupied sites (doublons) that reflects fundamental Mott physics. Doublon-hole recombination is estimated to occur on timescales of electronic hopping ℏ/J≈14 fs. Despite strong electron-phonon coupling, the dynamics can be explained by purely electronic effects captured by the single-band Hubbard model under the assumption of weak hole doping, in agreement with our static sample characterization. This sensitive interplay of static doping and vicinity to the metal-insulator transition suggests a way to modify doublon relaxation on the few-femtosecond timescale.
Place, publisher, year, edition, pages
American Physical Society , 2018. Vol. 120, no 16, article id 166401
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-89807DOI: 10.1103/PhysRevLett.120.166401ISI: 000430306800006PubMedID: 29756943Scopus ID: 2-s2.0-85045558936OAI: oai:DiVA.org:oru-89807DiVA, id: diva2:1530392
Note
Funding Agencies:
German Research Foundation (DFG) SFB 616 SPP 1458 SFB 1242 FOR1700
European Research Council (ERC) 278023 724103
2021-02-222021-02-222021-02-23Bibliographically approved