Ultrafast Doublon Dynamics in Photoexcited 1T - TaS2
| Autor: | Uwe Bovensiepen, Martin Eckstein, Y. Beyazit, Ph. Werner, M. Kalläne, I. Avigo, Manuel Ligges, Ping Zhou, L. Stojchevska, Kai Rossnagel, Denis Golež, Hugo U. R. Strand, Florian Diekmann, K. Hanff |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Hubbard model Condensed matter physics Photoemission spectroscopy Doping Relaxation (NMR) General Physics and Astronomy Non-equilibrium thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences 0103 physical sciences Electronic effect Condensed Matter::Strongly Correlated Electrons Strongly correlated material 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Letters. 120 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.120.166401 |
| Popis: | 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 $1T$-$\mathrm{Ta}{\mathrm{S}}_{2}$, 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 $\ensuremath{\hbar}/J\ensuremath{\approx}14\text{ }\text{ }\mathrm{fs}$. 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. |
| Databáze: | OpenAIRE |
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