scholarly journals Microscopic Modeling of Pump–Probe Spectroscopy and Population Inversion in Transition Metal Dichalcogenides

2020 ◽  
Vol 257 (12) ◽  
pp. 2000223
Author(s):  
Raül Perea-Causín ◽  
Samuel Brem ◽  
Ermin Malic
Keyword(s):  
Transition Metal ◽  
Population Inversion ◽  
Transition Metal Dichalcogenides ◽  
Pump Probe ◽  
Metal Dichalcogenides ◽  
Microscopic Modeling ◽  
Probe Spectroscopy

scholarly journals Triple sum frequency pump-probe spectroscopy of transition metal dichalcogenides

2019 ◽  
Vol 100 (23) ◽  
Author(s):  
Darien J. Morrow ◽  
Daniel D. Kohler ◽  
Yuzhou Zhao ◽  
Song Jin ◽  
John C. Wright
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Pump Probe ◽  
Sum Frequency ◽  
Metal Dichalcogenides ◽  
Probe Spectroscopy

Microscopic pump-probe optical technique to characterize the defect of monolayer transition metal dichalcogenides

2019 ◽  
Vol 7 (7) ◽  
pp. 711
Author(s):  
Ying Yu ◽  
Xiankun Zhang ◽  
Zhangkai Zhou ◽  
Zheng Zhang ◽  
Yanjun Bao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Optical Technique ◽  
Pump Probe ◽  
Metal Dichalcogenides

scholarly journals Ultrafast generation of pseudo-magnetic field for valley excitons in WSe2monolayers

Science ◽  
2014 ◽  
Vol 346 (6214) ◽  
pp. 1205-1208 ◽  
Author(s):  
Jonghwan Kim ◽  
Xiaoping Hong ◽  
Chenhao Jin ◽  
Su-Fei Shi ◽  
Chih-Yuan S. Chang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Stark Effect ◽  
Transition Metal Dichalcogenides ◽  
Degree Of Freedom ◽  
Energy Splitting ◽  
Pump Probe ◽  
Valley Polarization ◽  
Metal Dichalcogenides ◽  
Optical Stark Effect ◽  
Probe Spectroscopy

The valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX2). The capability to manipulate it, in analogy to the control of spin in spintronics, can open up exciting opportunities. Here, we demonstrate that an ultrafast and ultrahigh valley pseudo-magnetic field can be generated by using circularly polarized femtosecond pulses to selectively control the valley degree of freedom in monolayer MX2.Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe2monolayers from the nonresonant pump, resulting in an energy splitting of more than 10 milli–electron volts between the K and K′ valley exciton transitions. Our study opens up the possibility to coherently manipulate the valley polarization for quantum information applications.

scholarly journals Valley depolarization in downconversion and upconversion emission of monolayer WS2 at room temperature

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4809-4818
Author(s):  
Han Li ◽  
Yating Ma ◽  
Yizhen Sui ◽  
Yuxiang Tang ◽  
Ke Wei ◽  
...  
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Transition Metal Dichalcogenides ◽  
Upconversion Emission ◽  
Pump Probe ◽  
Saturated Absorption ◽  
Metal Dichalcogenides ◽  
Exciton Interactions ◽  
Anti Stokes ◽  
Probe Measurements

AbstractBenefiting from strong photon–exciton and phonon–exciton interactions in atomic thickness, transition metal dichalcogenides (TMDCs) are viewed as one promising platform for exploring elementary excitonic photoluminescence (PL) and intrinsic spin–valley properties at the monolayer limit. Despite well-studied Stokes downconversion (DC) PL, the anti-Stokes upconversion (UC) PL has been recently reported in TMDC monolayers, which mainly focus on UC mechanisms while detailed valley-related dynamical processes are unwittingly less concerned. Here, we carry out an in-depth investigation on both DC and UC emission features of monolayer WS2 at room temperature, where UC PL persists with energy gain up to 190 meV. The PL excitation and power-dependent experiments clearly distinguish the origins of DC PL and UC PL, which refer to saturated absorption and phonon-assisted transition from charged trions to neutral A-excitons. And contrast valley properties are observed in DC and UC scenarios with polarization-resolved PL and pump–probe measurements. According to the experimental facts, phenomenological dynamical DC and UC scenarios are modeled with intervalley depolarization taken into consideration, in which intermediates from spontaneous intervalley depolarization account for the observed emission and valley properties. This work can help understand the light–matter interactions and valley properties in monolayer TMDCs.

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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