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Bagnarol, Mirko (2017) Measurements of the surface susceptibility and conductivity of atomically thin MoS2 and WS2 by spectroscopic ellipsometry. [Laurea triennale]

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Abstract

The optical properties of a monolayer MoS2 or WS2 are described in literature by a bulk dielectric function. The material is modelled as a homogeneous medium with an effective thickness given by the interlayer spacing of the exfoliating bulk material. This model has been considered equivalent to the surface current model where the monolayer material is described as a truly two-dimensional system. Here we prove experimentally that for a monolayer MoS2 and WS2 the two models are not equivalent. We show how to correctly extract from the experimental data the surface susceptibility and the surface conductivity that describe the optical properties of a monolayer MoS2

Item Type:Laurea triennale
Corsi di Laurea Triennale:Scuola di Scienze > Fisica
Uncontrolled Keywords:monolayer, MoS2, WS2, surface current, transition metal dichalcogenide, ellipsometry, surface conductivity, surface susceptibility
Subjects:Area 02 - Scienze fisiche > FIS/01 Fisica sperimentale
Codice ID:56943
Relatore:Merano, Michele
Data della tesi:September 2017
Biblioteca:Polo di Scienze > Dip. Fisica e Astronomia "Galileo Galilei" - Biblioteca
Tipo di fruizione per il documento:on-line per i full-text
Tesi sperimentale (Si) o compilativa (No)?:Yes

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