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Coupled exciton-trion spin dynamics in a MoSe 2 monolayer
- Source :
- 2D Materials. 5:045024
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- Understanding and controlling the spin degree of freedom in two-dimensional transition metal dichalcogenides offers the potential for designing functional quantum materials. This work investigates the dynamics of photo- and resident carrier spins in an encapsulated MoSe2 monolayer using non-degenerate time-resolved Kerr-rotation microscopy. The lightly doped monolayer exhibits clear exciton and trion resonances with spin-polarizations that are characterized by a fast (~20 ps) decay attributed to photocarrier relaxation and recombination, followed by a slow (~690 ps) decay associated with resident carrier depolarization. Dual-frequency Kerr-rotation spectra directly reveal exciton-trion coupling on ultrashort timescales and within the spin coherence time of the system. Moreover, the distribution of the exciton-trion coupling features exposes inhomogeneous broadening likely arising from different domains within the excitation spot.
- Subjects :
- Materials science
Spins
Mechanical Engineering
Exciton
Relaxation (NMR)
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Molecular physics
Condensed Matter::Materials Science
Transition metal
Mechanics of Materials
0103 physical sciences
Monolayer
Condensed Matter::Strongly Correlated Electrons
General Materials Science
Trion
010306 general physics
0210 nano-technology
Spin (physics)
Excitation
Subjects
Details
- ISSN :
- 20531583
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- 2D Materials
- Accession number :
- edsair.doi...........34dee95ef9849ae0c4e874218937a5d4