Übersicht			Auf mobile öffnen

Lieferstatus:	Auf Bestellung (Lieferzeit unbekannt)
Veröffentlichung:	November 2017
Genre:	Naturwissensch., Medizin, Technik
	Applied optics / Atoms / B / Electronic devices & materials / Electronic materials / Interfaces (Physical sciences) / Laser / Lasers / Microscopy / Optical and Electronic Materials / Optical Materials / Optical physics / Optics, Lasers, Photonics, Optical Devices / Photonics / Physics / Physics and Astronomy / Plasma Physics / Scientific equipment, experiments & techniques / Semiconductors / spectroscopy / Spectroscopy and Microscopy / Spectrum analysis, spectrochemistry, mass spectrometry / Surface and Interface and Thin Film / Surface and Interface Science, Thin Films / Surfaces (Physics) / Thin films
ISBN:	9783319695532
EAN-Code:	9783319695532
Verlag:	Springer Nature EN
Einband:	Gebunden
Sprache:	English
Serie:	Springer Theses
Dimensionen:	H 235 mm / B 155 mm / D
Gewicht:	3495 gr
Seiten:	129
Illustration:	XVII, 129 p. 83 illus., 82 illus. in color., schwarz-weiss Illustrationen, farbige Illustrationen
Bewertung:	Titel bewerten / Meinung schreiben

Inhalt:

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 ofone 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.