9 Result(s)
within
Hyeonsik Cheong
Science, Humanities and Social Sciences, multidisciplinary
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Article
Open AccessFabrication of p-type 2D single-crystalline transistor arrays with Fermi-level-tuned van der Waals semimetal electrodes
High-performance p-type two-dimensional (2D) transistors are fundamental for 2D nanoelectronics. However, the lack of a reliable method for creating high-quality, large-scale p-type 2D semiconductors and a suitab...
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Article
Open AccessOptical phonons of SnSe(1−x)Sx layered semiconductor alloys
The evolution of the optical phonons in layered semiconductor alloys SnSe(1–x)Sx is studied as a function of the composition by using polarized Raman spectroscopy with six different excitation wavelengths (784.8,...
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Article
Coherent many-body exciton in van der Waals antiferromagnet NiPS3
An exciton is the bosonic quasiparticle of electron–hole pairs bound by the Coulomb interaction1. Bose–Einstein condensation of this exciton state has long been the subject of speculation in various model systems
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Article
Open AccessSuppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3
How a certain ground state of complex physical systems emerges, especially in two-dimensional materials, is a fundamental question in condensed-matter physics. A particularly interesting case is systems belong...
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Open AccessLow-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2
We investigated interlayer phonon modes of mechanically exfoliated few-layer 2H-SnS2 samples by using room temperature low-frequency micro-Raman spectroscopy. Raman measurements were performed using laser wavelen...
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Open AccessStrain-shear coupling in bilayer MoS2
Layered materials such as graphite and transition metal dichalcogenides have extremely anisotropic mechanical properties owing to orders of magnitude difference between in-plane and out-of-plane interatomic in...
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Article
Open AccessExcitation energy dependent Raman spectrum of MoSe2
Raman investigation of MoSe2 was carried out with eight different excitation energies. Seven peaks, including E1g, A1g, E2g1 and A2u2 peaks are observed in the range of 100–400 cm−1. The phonon modes are assigned...
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Article
Open AccessExcitation Energy Dependent Raman Signatures of ABA- and ABC-stacked Few-layer Graphene
The dependence of the Raman spectrum on the excitation energy has been investigated for ABA-and ABC- stacked few-layer graphene in order to establish the fingerprint of the stacking order and the number of lay...
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Article
Open AccessBetween Scylla and Charybdis: Hydrophobic Graphene-Guided Water Diffusion on Hydrophilic Substrates
The structure of water confined in nanometer-sized cavities is important because, at this scale, a large fraction of hydrogen bonds can be perturbed by interaction with the confining walls. Unusual fluidity pr...
