Time-resolved spectroscopy of coupled spin-valley-dynamics in monolayer transition metal dichalcogenides at low temperatures

2015 ◽  
Author(s):  
Gerd Plechinger ◽  
Philipp Nagler ◽  
Christian Schüller ◽  
Tobias Korn
Keyword(s):  
Transition Metal ◽  
Low Temperatures ◽  
Transition Metal Dichalcogenides ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Metal Dichalcogenides

scholarly journals Optically initialized robust valley-polarized holes in monolayer WSe2

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Wei-Ting Hsu ◽  
Yen-Lun Chen ◽  
Chang-Hsiao Chen ◽  
Pang-Shiuan Liu ◽  
Tuo-Hung Hou ◽  
...  
Keyword(s):  
Transition Metal ◽  
Low Temperatures ◽  
Room Temperature ◽  
Optical Pumping ◽  
Transition Metal Dichalcogenides ◽  
Kerr Rotation ◽  
Time Resolved ◽  
Recombination Lifetime ◽  
Valley Polarization ◽  
Metal Dichalcogenides

Abstract A robust valley polarization is a key prerequisite for exploiting valley pseudospin to carry information in next-generation electronics and optoelectronics. Although monolayer transition metal dichalcogenides with inherent spin–valley coupling offer a unique platform to develop such valleytronic devices, the anticipated long-lived valley pseudospin has not been observed yet. Here we demonstrate that robust valley-polarized holes in monolayer WSe2 can be initialized by optical pumping. Using time-resolved Kerr rotation spectroscopy, we observe a long-lived valley polarization for positive trion with a lifetime approaching 1 ns at low temperatures, which is much longer than the trion recombination lifetime (∼10–20 ps). The long-lived valley polarization arises from the transfer of valley pseudospin from photocarriers to resident holes in a specific valley. The optically initialized valley pseudospin of holes remains robust even at room temperature, which opens up the possibility to realize room-temperature valleytronics based on transition metal dichalcogenides.

scholarly journals Negative effective excitonic diffusion in monolayer transition metal dichalcogenides

Nanoscale ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 356-363 ◽  
Author(s):  
Roberto Rosati ◽  
Raül Perea-Causín ◽  
Samuel Brem ◽  
Ermin Malic
Keyword(s):  
Transition Metal ◽  
Low Temperatures ◽  
Effective Diffusion ◽  
Transition Metal Dichalcogenides ◽  
Spatial Profile ◽  
Intervalley Scattering ◽  
Metal Dichalcogenides

The bright exciton propagation in monolayers of transition metal dichalcogenides (TMDs) shows at low temperatures a shrinking of the spatial profile, i.e. negative effective diffusion due to intervalley scattering in the TMDs excitonic landscape.

The Phonon Mediated Anomalies of Thermal Expansion in Transition-Metal Componds and Emergent Nanostructures

2016 ◽  
Vol 257 ◽  
pp. 81-85 ◽  
Author(s):  
Victor Eremenko ◽  
Valentyna Sirenko ◽  
Alexander Dolbin ◽  
Sergey Feodosyev ◽  
Igor Gospodarev ◽  
...  
Keyword(s):  
Transition Metal ◽  
Low Temperatures ◽  
Lattice Dynamics ◽  
High Temperature Superconductors ◽  
Transition Metal Dichalcogenides ◽  
Tight Binding ◽  
Harmonic Approximation ◽  
Microscopic Analysis ◽  
Complex Structures ◽  
Metal Dichalcogenides

Abstract. The negative expansion observed at low temperatures in specific crystallographic directions of complex structures with anisotropic interactions is explained by microscopic analysis within the tight-binding, quasi-harmonic approximation of lattice dynamics. The results agree with measurements on multilayer sandwiches of transition-metal dichalcogenides, high-temperature superconductors and relevant nanostructures including the carbon-based nanotubes.

scholarly journals Super-resolved Optical Mapping of Reactive Sulfur-Vacancies in Two-Dimensional Transition Metal Dichalcogenides

ACS Nano ◽  
2021 ◽  
Author(s):  
Miao Zhang ◽  
Martina Lihter ◽  
Tzu-Heng Chen ◽  
Michal Macha ◽  
Archith Rayabharam ◽  
...  
Keyword(s):  
Transition Metal ◽  
Optical Mapping ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides

Highly electroconductive and uniform WS2 film growth by sulfurization of W film using diethyl sulfide

2021 ◽  
Author(s):  
Yoobeen Lee ◽  
Jin Won Jung ◽  
Jin Seok Lee
Keyword(s):  
Transition Metal ◽  
Grain Boundaries ◽  
High Performance ◽  
Film Growth ◽  
Transition Metal Dichalcogenides ◽  
Electronic Systems ◽  
Intrinsic Defects ◽  
Diethyl Sulfide ◽  
Metal Dichalcogenides

The reduction of intrinsic defects, including vacancies and grain boundaries, remains one of the greatest challenges to produce high-performance transition metal dichalcogenides (TMDCs) electronic systems. A deeper comprehension of the...

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