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Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy

Part of the Springer Theses Book Series

DOI: 10.1007/978-3-319-25376-3

ISBN: 978-3-319-25374-9

Publisher: Springer International Publishing - Springer Journals

Nov 10, 2015

LitStream

Chapter 1Introduction and Background

Li, Yilei

Pages: 1 –8

[Two-dimensional atomically thin materials presents a new frontier in the nanomaterial research. In this chapter, we will first discuss the optical techniques for the studying of two-dimensional materials and then an overview of the basic electronic and optical properties of the model material...
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Chapter 2Intrinsic Doping Dependence of Raman 2D Mode in Graphene: Signatures of Electron–Electron Interaction

Li, Yilei

Pages: 9 –18

[We have studied the Raman 2D mode in graphene, a resonant second-order process involving optical phonons pairs near the K point, under highly controlled variation in the charge density. To achieve excellent homogeneity of the charge density, we make use of electrostatic gating of graphene...
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Chapter 3Coupling of Strongly Localized Graphene Plasmons to Molecular Vibrations

Li, Yilei

Pages: 19 –28

[In this chapter, we first present a determination of the out-of-plane confinement of the plasmons in graphene nanoribbons. Using light with a free-space wavelength of ∼6 μm, we excite plasmons in graphene nanoribbons that are ∼100 nm wide. A red-shift in the plasmon frequency is induced by a...
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Chapter 4Dielectric Response of a Thin Sheet

Li, Yilei

Pages: 29 –32

[This chapter presents a general background of the dielectric response of materials, including the linear and nonlinear responses. In the context of two-dimensional materials, we discuss models that relates the intrinsic material response functions to the measurable optical properties.]
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Chapter 5Measurement of the Optical Dielectric Function of Monolayer Transition Metal Dichalcogenides: MoS2, MoSe2, WS2, and WSe2

Li, Yilei

Pages: 33 –43

[This chapter presents the complex in-plane dielectric function from 1.5 to 3 eV for monolayers of four transition metal dichalcogenides: MoSe2, WSe2, MoS2, and WS2. The results were obtained from optical reflection spectra using a Kramers–Kronig constrained variational analysis. From the...
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Chapter 6Measurement of the Second-Order Nonlinear Susceptibility and Probing Symmetry Properties of Few-Layer MoS2 and h-BN by Optical Second-Harmonic Generation

Li, Yilei

Pages: 45 –54

[We have measured optical second-harmonic generation (SHG) from atomically thin samples of MoS2 and h-BN with one to five layers. We observe strong modulation of the SHG intensity with layer number. This modulation is understood as the consequence of broken inversion symmetry in odd layers and...
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Chapter 7Valley Splitting and Polarization by Zeeman Effect in Monolayer MoSe2

Li, Yilei

Pages: 55 –64

[We have measured circularly polarization resolved photoluminescence in monolayer MoSe2 under magnetic fields up to 10 T in the Faraday geometry. The circularly polarized photoluminescence correspond to the emission from the K and K′ valleys, respectively. At low doping densities, the neutral and...
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Chapter 8Conclusion and Prospect

Li, Yilei

Pages: 65 –65

[In this chapter, we review briefly the topics covered in this thesis and then present a few remarks on the prospect of 2D materials research.]

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