scholarly journals Ultrafast evolution of the complex dielectric function of monolayer WS2 after photoexcitation

2021 ◽  
Author(s):  
Stefano Calati ◽  
Qiuyang Li ◽  
Xiaoyang Zhu ◽  
Julia Stähler
Keyword(s):  
Transition Metal ◽  
Time Evolution ◽  
Dielectric Function ◽  
Transition Metal Dichalcogenides ◽  
Optical Spectra ◽  
Complex Dielectric Function ◽  
Metal Dichalcogenides

Transition metal dichalcogenides emerged as ideal materials for the investigation of exciton physics. Retrieving the excitonic signature in optical spectra, and tracking their time evolution upon photoexcitation requires appropriate analysis...

scholarly journals Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers

Nanoscale ◽  
2019 ◽  
Vol 11 (25) ◽  
pp. 12381-12387 ◽  
Author(s):  
Samuel Brem ◽  
Jonas Zipfel ◽  
Malte Selig ◽  
Archana Raja ◽  
Lutz Waldecker ◽  
...  
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Transition Metal Dichalcogenides ◽  
Optical Spectra ◽  
Tungsten Diselenide ◽  
Dielectric Screening ◽  
Metal Dichalcogenides ◽  
Excitonic States

The reduced dielectric screening in atomically thin transition metal dichalcogenides allows to study the hydrogen-like series of higher exciton states in optical spectra even at room temperature.

Magneto-optical spectra of transition metal dichalcogenides: A comparative study

2014 ◽  
Vol 105 (22) ◽  
pp. 222411 ◽  
Author(s):  
Yen-Hung Ho ◽  
Chih-Wei Chiu ◽  
Wu-Pei Su ◽  
Ming-Fa Lin
Keyword(s):  
Transition Metal ◽  
Comparative Study ◽  
Transition Metal Dichalcogenides ◽  
Optical Spectra ◽  
Metal Dichalcogenides

scholarly journals Nonlocal dielectric function and nested dark excitons in MoS2

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Andreas Koitzsch ◽  
Anna-Sophie Pawlik ◽  
Carsten Habenicht ◽  
Tom Klaproth ◽  
Roman Schuster ◽  
...  
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Dielectric Function ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Particle Model ◽  
Momentum Dependence ◽  
Strong Light ◽  
Local Maxima ◽  
Metal Dichalcogenides

Abstract Their exceptional optical properties are a driving force for the persistent interest in atomically thin transition metal dichalcogenides such as MoS2. The optical response is dominated by excitons. Apart from the bright excitons, which directly couple to light, it has been realized that dark excitons, where photon absorption or emission is inhibited by the spin state or momentum mismatch, are decisive for many optical properties. However, in particular the momentum dependence is difficult to assess experimentally and often remains elusive or is investigated by indirect means. Here we study the momentum dependent electronic structure experimentally and theoretically. We use angle-resolved photoemission as a one-particle probe of the occupied valence band structure and electron energy loss spectroscopy as a two-particle probe of electronic transitions across the gap to benchmark a single-particle model of the dielectric function $$\epsilon ({\bf{q}},\omega )$$ ϵ ( q , ω ) against momentum dependent experimental measurements. This ansatz captures key aspects of the data surprisingly well. In particular, the energy region where substantial nesting occurs, which is at the origin of the strong light–matter interaction of thin transition metal dichalcogenides and crucial for the prominent C-exciton, is described well and spans a more complex exciton landscape than previously anticipated. Its local maxima in $$({\bf{q}}\ \ne \ 0,\omega )$$ ( q ≠ 0 , ω ) space can be considered as dark excitons and might be relevant for higher order optical processes. Our study may lead to a more complete understanding of the optical properties of atomically thin transition metal dichalcogenides.

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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