Influence of many-body effects on hole quasiparticle dynamics in a WS2 monolayer
| Autor: | Jing Yang, Kuan Eng Johnson Goh, Fabio Bussolotti, Hiroyo Kawai, Jing Yee Chee |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Electron mobility Spintronics Condensed matter physics Angle-resolved photoemission spectroscopy Charge (physics) 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Effective mass (spring–mass system) Condensed Matter::Superconductivity 0103 physical sciences Valleytronics Quasiparticle Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.045412 |
| Popis: | Monolayer (ML) transition metal dichalcogenides (TMDCs) emerged as ideal materials to combine spin and momentum of charge carriers for spintronics and valleytronics applications. Despite its relevance for TMDC-based technology, the impact of the various many-body-like interactions of charge carriers with defects, phonons, and other system's quasiparticles on the charge dynamics and transport properties remains experimentally elusive, being commonly overshadowed by the strong ML interactions with other materials (such as substrate and contacts) introduced in standard experimental approaches. Here, a method combining interface engineering and angle-resolved photoemission spectroscopy (ARPES) enables a direct investigation of the impact of many-body effects on the hole quasiparticle dynamics of ${\mathrm{WS}}_{2}$ ML on graphite and extraction of relevant transport parameters. In particular, at the valence band edge, a clear ARPES line-shape asymmetry is observed, mainly reflecting the hole interaction with intralayer electrons and defects while a negligible hole-phonon coupling is found. Using the valley hole quasiparticle lifetime and effective mass extracted from ARPES data at different temperatures, we estimated a hole mobility of $\ensuremath{\sim}300\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{2}\phantom{\rule{0.16em}{0ex}}{\mathrm{V}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$, comparable to some of the highest values reported by transport measurements. |
| Databáze: | OpenAIRE |
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