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Instrumentation development of a high-resolution two-laser spectroscopy setup and its applications to solid state devices

Zwol, F. A. van (2017) Instrumentation development of a high-resolution two-laser spectroscopy setup and its applications to solid state devices. Master's Thesis / Essay, Physics.

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Abstract

Optical methods can be used to find properties of solid state materials like the band structure, impurities, excitonic properties and information about lattice vibrations of these materials. In this thesis, we build a high resolution (< 1MHz linewidth and < 10MHz drift) two-laser spectroscopic setup which can be used to study these properties. We use the D 0 -D 0 X quantum spin system on shallow Si-doped gallium arsenide to confirm proper functioning of the setup. We obtain single-and two-laser scans and show the two-photon resonance effect of coherent population trapping at a magnetic field of about 1T. We also investigated the nuclear spin relaxation time and polarized the nuclear spin to increase this time, a main factor of the low spin coherence time of 2ns for the quantum superposition state in this GaAs system. We then modified the setup for single-laser photocurrent spectroscopy and obtain photocurrent spectra on MoSe 2 field effect transistors of a thickness varying from monolayer to bulk. We identified the A 0 exciton transition at 1.59eV and a spin-forbidden dark exciton optical transition A D 0 at 1.62eV from the photocurrent spectra of monolayer MoSe 2 . The bandgap dependence on thickness of MoSe 2 is characterized, ranging from 1.54eV for the monolayer to 1.46eV for the thicker TMDC-layers.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:32
Last Modified: 15 Feb 2018 08:32
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/15961

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