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Title	Spin Valley Polarization on two dimensional semiconducting WSE2
Alternative Title	Spin Valley Polarization on two dimensional semiconducting WSE2
Author	Μιχάλης Γαβαλάς
Thesis advisor	Κιοσέογλου, Γεώργιος
Abstract	Transition Metal Dichalcogenides (TMDs), MX2 (M = Mo, W and X = S, Se) is an extensively-studied class of materials. They are weakly bonded layered structures that can be reduced to single monolayer twodimensional semiconductor crystals. Unlike their three-dimensional counterparts that are indirect gap semiconductors, and unlike graphene which has a zero bandgap, single layers of MX2 have a direct-gap at the K-point of the Brillouin zone with a range of bandgaps in the visible spectrum, making them suitable for optoelectronic applications from light emitting diodes to light harvesting and sensors. In the present work, we study two-dimensional monolayers of WSe2 after mechanical exfoliation from the bulk crystal. Several spectroscopic techniques such as Raman, photoluminescence and reflection, are used to study the excitonic properties of this material. Also, using circular polarized light, we study the polarization of the emitted light as function of temperature in the range from 78K to 300K.
Language	English
Issue date	2020-03-18
Collection	School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Graduate theses
	Type of Work--Graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/9/0/c/metadata-dlib-user1591037180-30923.tkl
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