Produktbild: Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

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Springer Theses

ISBN: 3319695533
ISBN 13: 9783319695532
Autor: Sie, Edbert Jarvis
Verlag: Springer Verlag GmbH
Umfang: xvii, 129 S., 1 s/w Illustr., 82 farbige Illustr., 129 p. 83 illus., 82 illus. in color.
Erscheinungsdatum: 21.11.2017
Auflage: 1/2018
Produktform: Gebunden/Hardback
Einband: Gebunden

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.

Artikelnummer: 2876020 Kategorie:

Beschreibung

Nominated as an outstanding Ph.D. thesis by Massachusetts Institute of Technology, USA Presents results that are vital for the emerging field of valleytronics Offers insights into the novel optical and electronic properties or monolayer transition-metal dichalcogenides Describes innovative spectroscopic techniques for semiconductor physics

Autorenporträt

Edbert Jarvis Sie was awarded a PhD in physics by Massachusetts Institute of Technology in 2017. He is now a postdoctoral research fellow at Stanford University.

Herstellerkennzeichnung:


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E-Mail: juergen.hartmann@springer.com

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