Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy

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Springer, Nov 9, 2015 - Technology & Engineering - 69 pages
This thesis focuses on the study of the optical response of new atomically thin two-dimensional crystals, principally the family of transition metal dichalcogenides like MoS2. One central theme of the thesis is the precise treatment of the linear and second-order nonlinear optical susceptibilities of atomically thin transition metal dichalcogenides. In addition to their significant scientific interest as fundamental material responses, these studies provide essential knowledge and convenient characterization tools for the application of these 2D materials in opto-electronic devices. Another important theme of the thesis is the valley physics of atomically thin transition metal dichalcogenides. It is shown that the degeneracy in the valley degree of freedom can be lifted and a valley polarization can be created using a magnetic field, which breaks time reversal symmetry in these materials. These findings enhance our basic understanding of the valley electronic states and open up new opportunities for valleytronic applications using two-dimensional materials.
 

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Contents

Introduction and Background
1
Intrinsic Doping Dependence of Raman 2D Mode in Graphene Signatures of ElectronElectron Interaction
9
Coupling of Strongly Localized Graphene Plasmons to Molecular Vibrations
19
Dielectric Response of a Thin Sheet
29
Measurement of the Optical Dielectric Function of Monolayer Transition Metal Dichalcogenides MoS2 MoSe2 WS2 and WSe2
33
Measurement of the SecondOrder Nonlinear Susceptibility and Probing Symmetry Properties of FewLayer MoS2 and hBN by Optical SecondHarmo...
45
Valley Splitting and Polarization by Zeeman Effect in Monolayer MoSe2
55
Conclusion and Prospect
65
Curriculum Vitae
66
Copyright

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