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Coherent light-matter interactions i...

Sie, Edbert Jarvis.

Coherent light-matter interactions in monolayer transition-metal dichalcogenides

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Coherent light-matter interactions in monolayer transition-metal dichalcogenidesby Edbert Jarvis Sie.
作者:	Sie, Edbert Jarvis.
出版者:	Cham :Springer International Publishing :2018.
面頁冊數:	xvii, 129 p. :ill., digital ;24 cm.
Contained By:	Springer eBooks
標題:	Monomolecular films.
電子資源:	http://dx.doi.org/10.1007/978-3-319-69554-9
ISBN:	9783319695549$q(electronic bk.)

Coherent light-matter interactions in monolayer transition-metal dichalcogenides
Sie, Edbert Jarvis.

Coherent light-matter interactions in monolayer transition-metal dichalcogenides[electronic resource] /by Edbert Jarvis Sie. - Cham :Springer International Publishing :2018. - xvii, 129 p. :ill., digital ;24 cm. - Springer theses,2190-5053. - Springer theses..

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.

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: 9783319695549$q(electronic bk.)

Standard No.: 10.1007/978-3-319-69554-9doiSubjects--Topical Terms:

340254
Monomolecular films.

LC Class. No.: QD509.M65

Dewey Class. No.: 530.4175

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520 $a 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.
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