Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides (Hardcover, 1st ed. 2018)

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.

General

Imprint:	Springer International Publishing AG
Country of origin:	Switzerland
Series:	Springer Theses
Release date:	November 2017
First published:	2018
Authors:	Edbert Jarvis Sie
Dimensions:	235 x 155mm (L x W)
Format:	Hardcover
Pages:	129
Edition:	1st ed. 2018
ISBN-13:	978-3-319-69553-2
Categories:	Books > Science & Mathematics > Physics > States of matter > Condensed matter physics (liquids & solids) Books > Science & Mathematics > Physics > States of matter > Plasma physics Books > Professional & Technical > Electronics & communications engineering > Electronics engineering > Electronic devices & materials > General Books > Professional & Technical > Electronics & communications engineering > Electronics engineering > Applied optics > Laser technology Books > Science & Mathematics > Chemistry > Analytical chemistry > Qualitative analytical chemistry > Chemical spectroscopy, spectrochemistry > General
LSN:	3-319-69553-3
Barcode:	9783319695532

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