scholarly journals Direct and ultrafast probing of quantum many-body interactions through coherent two-dimensional spectroscopy: From weak- to strong-interaction regimes

2021 ◽  
Vol 104 (11) ◽  
Author(s):  
Nguyen Thanh Phuc ◽  
Pham Quang Trung
Keyword(s):  
Strong Interaction ◽  
Two Dimensional ◽  
Many Body ◽  
Many Body Interactions

Possible weakening of the many-body interactions in the organic quasi-two-dimensional metal α-(BETS)2NH4Hg(SCN)4

2009 ◽  
Vol 109 (4) ◽  
pp. 664-666 ◽  
Author(s):  
S. I. Pesotskiĭ ◽  
R. B. Lyubovskiĭ ◽  
M. V. Kartsovnik ◽  
W. Biberacher ◽  
N. D. Kushch ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Many Body ◽  
The Many ◽  
Many Body Interactions

scholarly journals Giant enhancement of exciton diffusivity in two-dimensional semiconductors

2020 ◽  
Vol 6 (51) ◽  
pp. eabb4823
Author(s):  
Yiling Yu ◽  
Yifei Yu ◽  
Guoqing Li ◽  
Alexander A. Puretzky ◽  
David B. Geohegan ◽  
...  
Keyword(s):  
Threshold Value ◽  
Great Promise ◽  
Two Dimensional ◽  
Incident Power ◽  
Many Body ◽  
Device Development ◽  
Exciton Transport ◽  
2D Semiconductors ◽  
Many Body Interactions ◽  
Exciton Scattering

Two-dimensional (2D) semiconductors bear great promise for application in optoelectronic devices, but the low diffusivity of excitons stands as a notable challenge for device development. Here, we demonstrate that the diffusivity of excitons in monolayer MoS2 can be improved from 1.5 ± 0.5 to 22.5 ± 2.5 square centimeters per second with the presence of trapped charges. This is manifested by a spatial expansion of photoluminescence when the incident power reaches a threshold value to enable the onset of exciton Mott transition. The trapped charges are estimated to be in a scale of 1010 per square centimeter and do not affect the emission features and recombination dynamics of the excitons. The result indicates that trapped charges provide an attractive strategy to screen exciton scattering with phonons and impurities/defects. Pointing towards a new pathway to control exciton transport and many-body interactions in 2D semiconductors.

scholarly journals Phonon-assisted processes in the ultraviolet-transient optical response of graphene

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Dino Novko ◽  
Marko Kralj
Keyword(s):  
Dominant Role ◽  
Chemical Doping ◽  
Two Dimensional ◽  
Many Body ◽  
Time Resolved ◽  
Electron Phonon Interaction ◽  
Spectral Changes ◽  
Two Dimensional Materials ◽  
Many Body Interactions

AbstractMany recent experiments investigated potential and attractive means of modifying many-body interactions in two-dimensional materials through time-resolved spectroscopy techniques. However, the role of ultrafast phonon-assisted processes in two-dimensional systems is rarely discussed in depth. Here, we investigate the role of electron–phonon interaction in the transient optical absorption of graphene by means of first-principles methods. It is shown at equilibrium that the phonon-assisted transitions renormalize significantly the electronic structure. As a result, absorption peak around the Van-Hove singularity broadens and redshifts by ~100 meV. In addition, temperature increase and chemical doping are shown to notably enhance these phonon-assisted features. In the photoinduced transient response, we obtain spectral changes in close agreement with the experiments, and we associate them to the strong renormalization of occupied and unoccupied $$\pi$$π bands, which predominantly comes from the coupling with the zone-center $${E}_{2g}$$E2g optical phonon. Our estimation of the Coulomb interaction effects shows that the phonon-assisted processes can have a dominant role even in the subpicosecond regime.

Many-body interactions, the quantum Hall effect, and insulating phases in bilayer two-dimensional hole-gas systems

1998 ◽  
Vol 249-251 ◽  
pp. 819-823 ◽  
Author(s):  
A.R. Hamilton ◽  
M.Y. Simmons ◽  
T.G. Griffiths ◽  
A.K. Savchenko ◽  
M. Pepper ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Two Dimensional ◽  
Many Body ◽  
Many Body Interactions
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