Title Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides Author(s) Sie, Edbert Jarvis Publication Cham, Springer International Publishing, 2018. Description XVII, 129 p. 83 illus., 82 illus. in color : online resource Abstract Note 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 ISBN,Price 9783319695549 Keyword(s) 1. ATOMS 2. Atoms and Molecules in Strong Fields, Laser Matter Interaction 3. EBOOK 4. EBOOK - SPRINGER 5. Electronic materials 6. Interfaces (Physical sciences) 7. LASERS 8. MICROSCOPY 9. Optical and Electronic Materials 10. OPTICAL MATERIALS 11. Optics, Lasers, Photonics, Optical Devices 12. PHOTONICS 13. PHYSICS 14. SEMICONDUCTORS 15. SPECTROSCOPY 16. Spectroscopy and Microscopy 17. Surface and Interface Science, Thin Films 18. Surfaces (Physics) 19. THIN FILMS Item Type eBook Multi-Media Links Please Click here for eBook Circulation Data Accession#   Call# Status Issued To Return Due On Physical Location I09896     On Shelf