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Autore: | Sie Edbert Jarvis |
Titolo: | Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides / / by Edbert Jarvis Sie |
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 |
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