scholarly journals Electrodynamics of two-dimensional materials: Role of anisotropy

2018 ◽  
Vol 98 (12) ◽  
Author(s):  
Bruno Majérus ◽  
Evdokia Dremetsika ◽  
Michaël Lobet ◽  
Luc Henrard ◽  
Pascal Kockaert
Keyword(s):  
Two Dimensional ◽  
Two Dimensional Materials

scholarly journals Ab initio nanofluidics: disentangling the role of the energy landscape and of density correlations on liquid/solid friction

Nanoscale ◽  
2020 ◽  
Vol 12 (20) ◽  
pp. 10994-11000
Author(s):  
Gabriele Tocci ◽  
Maria Bilichenko ◽  
Laurent Joly ◽  
Marcella Iannuzzi
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Energy Landscape ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Order Of Magnitude ◽  
Solid Friction ◽  
Density Correlations

Ab initio molecular dynamics reveals that subtle variations in the energy landscape and density correlations can change by up to one order of magnitude the slippage of water on two-dimensional materials.

scholarly journals Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Pranab Kumar Das ◽  
D. Di Sante ◽  
I. Vobornik ◽  
J. Fujii ◽  
T. Okuda ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Transition Metal Dichalcogenides ◽  
Photoemission Spectroscopy ◽  
Two Dimensional ◽  
Quantum Phenomenon ◽  
Two Dimensional Materials ◽  
Metal Dichalcogenides ◽  
Electron And Hole States ◽  
Dependent Behaviour

Abstract The behaviour of electrons and holes in a crystal lattice is a fundamental quantum phenomenon, accounting for a rich variety of material properties. Boosted by the remarkable electronic and physical properties of two-dimensional materials such as graphene and topological insulators, transition metal dichalcogenides have recently received renewed attention. In this context, the anomalous bulk properties of semimetallic WTe2 have attracted considerable interest. Here we report angle- and spin-resolved photoemission spectroscopy of WTe2 single crystals, through which we disentangle the role of W and Te atoms in the formation of the band structure and identify the interplay of charge, spin and orbital degrees of freedom. Supported by first-principles calculations and high-resolution surface topography, we reveal the existence of a layer-dependent behaviour. The balance of electron and hole states is found only when considering at least three Te–W–Te layers, showing that the behaviour of WTe2 is not strictly two dimensional.

Insights on the dual role of two-dimensional materials as catalysts and supports for energy and environmental catalysis

2021 ◽  
Author(s):  
Li Xin Chen ◽  
Zhi Wen Chen ◽  
Ming Jiang ◽  
Zhuole Lu ◽  
Chan Gao ◽  
...  
Keyword(s):  
Rational Design ◽  
2D Materials ◽  
Dual Role ◽  
Environmental Catalysis ◽  
Two Dimensional ◽  
Dual Roles ◽  
Two Dimensional Materials

The application of 2D materials in catalysis has great potential, opportunities, and challenges. The dual roles (catalysts and supports) of 2D materials determine different strategies for rational design of 2D-based catalysts.

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.

Energy Transfer from Quantum Dots to Graphene and MoS2: The Role of Absorption and Screening in Two-Dimensional Materials

Nano Letters ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 2328-2333 ◽  
Author(s):  
Archana Raja ◽  
Andrés Montoya−Castillo ◽  
Johanna Zultak ◽  
Xiao-Xiao Zhang ◽  
Ziliang Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Two Dimensional ◽  
Two Dimensional Materials
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