Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides
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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. eBook.

Lieferung aus: Vereinigte Staaten von Amerika, Lagernd.
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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Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides: 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. Englisch, Ebook.

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Erscheinungsdatum: 02.12.2017, Medium: Buch, Einband: Gebunden, Titel: Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides, Autor: Sie, Edbert Jarvis, Verlag: Springer-Verlag GmbH // Springer International Publishing, Sprache: Englisch, Schlagworte: Elektronik // Halbleiter // Leitung // physikalisch // Experiment // Versuch // Forschung // naturwissenschaftlich // Festkörperphysik // Physik // Plasma // Chemie // Massenspektrometrie // Spektrometrie // Spektroskopie // Elektrogerät // Gerät // Laser // Mathematik // Technologie // Optik // Materialwissenschaft // SCIENCE // Physics // Condensed Matter // Wissenschaftliche Ausstattung // Experimente und Techniken // Plasmaphysik // Spektrochemie // Elektronische Geräte und Materialien // Lasertechnik und Holographie // Mathematische Physik // Optische Physik, Rubrik: Theoretische Physik, Seiten: 129, Abbildungen: 1 schwarz-weisse und 74 farbige Abbildungen, 75 farbige Tabellen, Bibliographie, Herkunft: GROSSBRITANNIEN (GB), Reihe: Springer Theses, Informationen: Book, Gewicht: 380 gr, Verkäufer: averdo.

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Erscheinungsdatum: 04.09.2018, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides, Auflage: Softcover reprint of the original 1st ed. 2018, Autor: Sie, Edbert Jarvis, Verlag: Springer International Publishing, Sprache: Englisch, Rubrik: Theoretische Physik, Seiten: 148, Informationen: Previously published in hardcover, Gewicht: 234 gr, Verkäufer: averdo.

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