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Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides : Springer Theses - Edbert Jarvis Sie

Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

By: Edbert Jarvis Sie

Hardcover | 21 November 2017

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This thesis presents optical methods to split the energy levels of electronic valleys in transition-metal dichalcogenides (TMDs) by means of coherent light-matter interactions. The electronic valleys found in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors when thinned down to a few atomic layers, and have have been proposed as a new way to carry information in next generation devices (so-called valleytronics). These valleys are, however, normally locked in the same energy level, which limits their potential use for applications. The author describes experiments performed with a pump-probe technique using transient absorption spectroscopy on MoS2 and WS2. It is demonstrated that hybridizing the electronic valleys with light allows one to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, one can tune the energy level of one valley through the optical Stark effect. Also presented within are observations, at larger detuning, of a separate contribution from the so-called Bloch--Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, enabling one to separate the two effects at two different valleys.

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Non-FictionSciencePhysicsMaterials & States of MatterCondensed Matter Physics including Liquid State & Solid State PhysicsEngineering & TechnologyOther Technologies & Applied SciencesApplied OpticsLaser Technology & HolographyPlasma PhysicsElectronics & Communications EngineeringElectronics Engineering
Electronic Devices & MaterialsSemi-Conductors & Super-ConductorsChemistryAnalytical ChemistrySpectrum AnalysisMechanical Engineering & MaterialsMaterials ScienceAtomic & Molecular PhysicsOptical Physics

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