Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides [[electronic resource] /] / by Edbert Jarvis Sie

• Autore: Sie Edbert Jarvis
• Pubblicazione: Cham : , : Springer International Publishing : , : Imprint : Springer, , 2018
• Edizione: 1st ed. 2018.
• Descrizione fisica: 1 online resource (XVII, 129 p. 83 illus., 82 illus. in color.)
• Disciplina: 541.33
• Soggetto topico: Surfaces (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; Atoms and Molecules in Strong Fields, Laser Matter Interaction
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: 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.
• Sommario/riassunto: 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.
• Titolo autorizzato: Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides
• ISBN: 3-319-69554-1
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910300551003321
• Lo trovi qui: Univ. Federico II
• Serie: Springer Theses, Recognizing Outstanding Ph.D. Research, . 2190-5053