2,979 research outputs found
Atomic-Scale Observation of Monoclinic Nanodomain in VO2 with Ultra-Fast and Energy Efficient Metal-Insulator Transition
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Atomic-scale observation of isostructural metal-insulator transition in cation-doped VO2 thin films
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The stability of hole-doped antiferromagnetic state in a two-orbital model
No full textWe investigate the hole-doped antiferromagnetic state in a two-orbital model of cuprates. The
model also includes d3z2−r2 orbital. Unlike the one-orbital model, we find the antiferromagnetic
state stable against the hole doping for the cuprates with orbital splitting between dx2−y2 and d3z2−r2
orbitals being ∼1 eV. This results from the fact that the Hund’s coupling enforces the filling of
dx2−y2 orbital ≈1 indicated by a significant reduction of dx2−y2 spectral density at the Fermi level.
This, in turn, leads to the suppression of intraband fluctuations detrimental to the
antiferromagnetic phase. In this scenario, hole doping involves removal of mainly d3z2−r2 electrons
that are comparatively more localized. One important caveat of our meanfield theoretic result and
conclusion is that they are reliable only for a very low hole doping region.11Yscopu
Franny Choi, 41st Annual ODU Literary Festival
No full textFranny Choi is a queer, Korean-American poet, playwright, teacher, organizer, pottymouth, GryffinClaw, and general overachiever. She is the author of Floating, Brilliant, Gone (2014), and a chapbook, Death by Sex Machine (2017). She has received awards from the Poetry Foundation and the Helen Zell Writers Program, as well as fellowships from the Vermont Studio Center and the Rhode Island State Council on the Arts. Her poems have appeared in journals including Poetry magazine, American Poetry Review, New England Review, and her work has been featured by the Huffington Post, PBS NewsHour, and Angry Asian Man
Heterogeneous integration of single-crystalline rutile nanomembranes with steep phase transition on silicon substrates
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Directional ionic transport across the oxide interface enables low-temperature epitaxy of rutile TiO2
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Understanding the Physical Origin of Anisotropic Oxygen Diffusion Process during TiO2 Epitaxy on VO2 Surface through First-Principles Calculations
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Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation
No full textZeolitic imidazolate frameworks (ZIFs) are promising for gas separation membrane, but their molecular cut-off differs from that expected from its intrinsic aperture structure because of their flexibility. Herein, we introduced graphene nanoribbons (GNRs) to rigidify the ZIF framework. Because the sp(2) edge of the GNRs induces strong anchoring effects, the modified layer can be rigidified. Particularly, when the GNRs were embedded and distributed in the ZIF-8 layer, an intrinsic aperture size of 3.4 angstrom was observed, resulting in high H-2/CO2 separation (H-2 permeance: 5.2x10(-6) mol/m(2) Pa s, ideal selectivity: 142). The performance surpasses the upper bound of polycrystalline MOF membrane performance. In addition, the membrane can be applied to blue H-2 production, as demonstrated with a simulated steam reformed gas containing H-2/CO2/CH4. The separation performance was retained in the presence of water. The fundamentals of the molecular transport through the rigid ZIF-8 framework were revealed using molecular dynamics simulations.
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