Significance of Coulomb interaction in interlayer coupling, polarized Raman intensities, and infrared activities in the layered van der Waals semiconductor GaSe

2021 ◽  
Vol 103 (19) ◽  
Author(s):  
Manish K. Niranjan
Keyword(s):  
Coulomb Interaction ◽  
Van Der Waals ◽  
Interlayer Coupling ◽  
Raman Intensities ◽  
Polarized Raman

scholarly journals Natural van der Waals heterostructure cylindrite with highly anisotropic optical responses

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Arindam Dasgupta ◽  
Jie Gao ◽  
Xiaodong Yang
Keyword(s):  
Van Der Waals ◽  
Linear Dichroism ◽  
Third Harmonic ◽  
Inhomogeneous Strain ◽  
Optical Responses ◽  
Naturally Occurring ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure ◽  
Polarized Raman ◽  
On Chip

AbstractThe mechanical exfoliation of naturally occurring layered materials has emerged as an easy and effective method for achieving ultrathin van der Waals (vdW) heterostructures with well-defined lattice orientations of the constituent two-dimensional (2D) material layers. Cylindrite is one such naturally occurring vdW heterostructure, where the superlattice is composed of alternating stacks of SnS2-like and PbS-like layers. Although the constituent 2D lattices are isotropic, inhomogeneous strain occurring from local atomic alignment for forcing the commensuration makes the cylindrite superlattice structurally anisotropic. Here, we demonstrate the highly anisotropic optical responses of cylindrite thin flakes induced by the anisotropic crystal structure, including angle-resolved polarized Raman scattering, linear dichroism, and polarization-dependent anisotropic third-harmonic generation. Our results provide a promising approach for identifying various natural vdW heterostructure-based 2D materials with tailored optical properties and can be harnessed for realizing anisotropic optical devices for on-chip photonic circuits and optical information processing.

scholarly journals Imaging of Interlayer Coupling in van der Waals Heterostructures Using a Bright-Field Optical Microscope

Nano Letters ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 5342-5349 ◽  
Author(s):  
Evgeny M. Alexeev ◽  
Alessandro Catanzaro ◽  
Oleksandr V. Skrypka ◽  
Pramoda K. Nayak ◽  
Seongjoon Ahn ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Interlayer Coupling ◽  
Optical Microscope ◽  
Bright Field ◽  
Van Der Waals Heterostructures

scholarly journals Temperature and interlayer coupling induced thermal transport across graphene/2D-SiC van der Waals heterostructure

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Md. Sherajul Islam ◽  
Imon Mia ◽  
A. S. M. Jannatul Islam ◽  
Catherine Stampfl ◽  
Jeongwon Park
Keyword(s):  
High Temperatures ◽  
Thermal Transport ◽  
Van Der Waals ◽  
Thermal Conductance ◽  
Interlayer Coupling ◽  
Phonon Modes ◽  
Out Of Plane ◽  
System Temperature ◽  
Non Equilibrium Molecular Dynamics ◽  
Increasing Temperature

AbstractGraphene based two-dimensional (2D) van der Waals (vdW) materials have attracted enormous attention because of their extraordinary physical properties. In this study, we explore the temperature and interlayer coupling induced thermal transport across the graphene/2D-SiC vdW interface using non-equilibrium molecular dynamics and transient pump probe methods. We find that the in-plane thermal conductivity κ deviates slightly from the 1/T law at high temperatures. A tunable κ is found with the variation of the interlayer coupling strength χ. The interlayer thermal resistance R across graphene/2D-SiC interface reaches 2.71 $$\times$$ × 10–7$${\text{Km}}^{2} /{\text{W}}$$ Km 2 / W at room temperature and χ = 1, and it reduces steadily with the elevation of system temperature and χ, demonstrating around 41% and 56% reduction with increasing temperature to 700 K and a χ of 25, respectively. We also elucidate the heat transport mechanism by estimating the in-plane and out-of-plane phonon modes. Higher phonon propagation possibility and Umklapp scattering across the interface at high temperatures and increased χ lead to the significant reduction of R. This work unveils the mechanism of heat transfer and interface thermal conductance engineering across the graphene/2D-SiC vdW heterostructure.

scholarly journals Investigation on the interlayer coupling and bonding in layered nitride-halides ThNF and ThNCl

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28698-28703
Author(s):  
Xiao Liu ◽  
Da-Yong Liu ◽  
Ting-Ting Li ◽  
Dong-Meng Chen ◽  
Liang-Jian Zou
Keyword(s):  
Charge Transfer ◽  
Chemical Bond ◽  
Van Der Waals ◽  
Interlayer Coupling ◽  
Li Ion

Showing that the interlayer charge transfer and chemical bond in ThNF and ThNCl are considerable larger than the van der Waals compound ZrNCl, addressing the difficulty in intercalating Li ion or other charged molecules.

Identification of Vibrational Modes in BaSi2 Epitaxial Films by Infrared and Raman Spectroscopy

2018 ◽  
Vol 386 ◽  
pp. 43-47 ◽  
Author(s):  
Hirofumi Hoshida ◽  
Naoki Murakoso ◽  
Takashi Suemasu ◽  
Yoshikazu Terai
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Epitaxial Films ◽  
Ir Absorption ◽  
Vibrational Modes ◽  
Depolarization Ratio ◽  
Phonon Line ◽  
Infrared And Raman Spectroscopy ◽  
Raman Intensities ◽  
Polarized Raman

Infrared (IR) absorption and polarized Raman spectra were measured in BaSi2 epitaxial films to investigate the vibrational modes and the symmetry of Si4 cluster in BaSi2. By an analysis based on Raman and/or IR activity in the spectra, the symmetry of Si4 cluster was determined as Th-symmetry and the observed Raman lines and IR peaks were assigned to Ag, Eg, Fg, and Fu, respectively. In the three Raman lines of Fg-mode, one LO phonon line and two TO phonon lines were classified by the depolarization ratio of polarized Raman intensities.

scholarly journals The enhanced ferromagnetism of single-layer CrX3 (X = Br and I) via van der Waals engineering

2019 ◽  
Vol 21 (22) ◽  
pp. 11949-11955 ◽  
Author(s):  
Hongxing Li ◽  
Yuan-Kai Xu ◽  
Kang Lai ◽  
Wei-Bing Zhang
Keyword(s):  
Van Der Waals ◽  
Single Layer ◽  
Interlayer Coupling

The ferromagnetism of CrI3 and CrBr3 is enhanced by interlayer coupling.

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