05164nam 22008655 450 991030055100332120200629201851.03-319-69554-110.1007/978-3-319-69554-9(CKB)4100000001040967(DE-He213)978-3-319-69554-9(MiAaPQ)EBC5144871(PPN)221247262(EXLCZ)99410000000104096720171112d2018 u| 0engurnn|008mamaatxtrdacontentcrdamediacrrdacarrierCoherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides /by Edbert Jarvis Sie1st ed. 2018.Cham :Springer International Publishing :Imprint: Springer,2018.1 online resource (XVII, 129 p. 83 illus., 82 illus. in color.) Springer Theses, Recognizing Outstanding Ph.D. Research,2190-50533-319-69553-3 Includes bibliographical references.Chapter1. Introduction -- Chapter2. Time-resolved absorption spectroscopy -- Chapter3. Intervalley biexcitons in monolayer MoS2 -- Chapter4. Valley-selective optical Stark effect in monolayer WS2 -- Chapter5. Intervalley biexcitonic optical Stark effect in monolayer WS2 -- Chapter6. Large, valley-exclusive Bloch--Siegert shift in monolayer WS2 -- Chapter7. Lennard--Jones-like potential of 2D excitons in monolayer WS2 -- Chapter8. WUV based Time-resolved ARPES.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 present in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors 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 experiment performed with a pump-probe technique using a 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.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Surfaces (Physics)Interfaces (Physical sciences)Thin filmsOptical materialsElectronic materialsSpectroscopyMicroscopyLasersPhotonicsSemiconductorsAtomsPhysicsSurface and Interface Science, Thin Filmshttps://scigraph.springernature.com/ontologies/product-market-codes/P25160Optical and Electronic Materialshttps://scigraph.springernature.com/ontologies/product-market-codes/Z12000Spectroscopy and Microscopyhttps://scigraph.springernature.com/ontologies/product-market-codes/P31090Optics, Lasers, Photonics, Optical Deviceshttps://scigraph.springernature.com/ontologies/product-market-codes/P31030Semiconductorshttps://scigraph.springernature.com/ontologies/product-market-codes/P25150Atoms and Molecules in Strong Fields, Laser Matter Interactionhttps://scigraph.springernature.com/ontologies/product-market-codes/P24025Surfaces (Physics).Interfaces (Physical sciences).Thin films.Optical materials.Electronic materials.Spectroscopy.Microscopy.Lasers.Photonics.Semiconductors.Atoms.Physics.Surface and Interface Science, Thin Films.Optical and Electronic Materials.Spectroscopy and Microscopy.Optics, Lasers, Photonics, Optical Devices.Semiconductors.Atoms and Molecules in Strong Fields, Laser Matter Interaction.541.33Sie Edbert Jarvisauthttp://id.loc.gov/vocabulary/relators/aut1058293MiAaPQMiAaPQMiAaPQBOOK9910300551003321Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides2498793UNINA