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https://www.readbyqxmd.com/read/29219366/topological-edge-state-manifestation-of-interacting-2d-condensed-boson-lattice-systems-in-a-harmonic-trap
#1
Bogdan Galilo, Derek K K Lee, Ryan Barnett
In this Letter, it is shown that interactions can facilitate the emergence of topological edge states of quantum-degenerate bosonic systems in the presence of a harmonic potential. This effect is demonstrated with the concrete model of a hexagonal lattice populated by spin-one bosons under a synthetic gauge field. In fermionic or noninteracting systems, the presence of a harmonic trap can obscure the observation of edge states. For our system with weakly interacting bosons in the Thomas-Fermi regime, we can clearly see a topological band structure with a band gap traversed by edge states...
November 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29185437/hierarchy-and-scaling-behavior-of-multi-rank-domain-patterns-in-ferroelectric-k0-9na0-1nbo3-strained-films
#2
Dorothee Braun, Martin Schmidbauer, Michael Hanke, Jutta Schwarzkopf
The formation process of a ferroelectric multi-rank domain pattern in the thickness range of 7-52 nm is investigated for monoclinic K0.9Na0.1NbO3 strained epitaxial films on (110) NdScO3 substrates. Although the elastic strain energy density is degenerated for two pseudocubic orientations, a distinctive hierarchy of domain evolution is observed with exclusive in-plane a1a2 domains for very thin films and the retarded onset of a ferroelectric MC phase at larger film thickness. This is accompanied by a thickness dependent transformation from stripe domains to a herringbone pattern and, eventually, for the thickest film, to a checkerboard-like structure...
November 29, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29184139/hourglass-dirac-chain-metal-in-rhenium-dioxide
#3
Shan-Shan Wang, Ying Liu, Zhi-Ming Yu, Xian-Lei Sheng, Shengyuan A Yang
Nonsymmorphic symmetries, which involve fractional lattice translations, can generate exotic types of fermionic excitations in crystalline materials. Here we propose a topological phase arising from nonsymmorphic symmetries-the hourglass Dirac chain metal, and predict its realization in the rhenium dioxide. We show that ReO2 features hourglass-type dispersion in the bulk electronic structure dictated by its nonsymmorphic space group. Due to time reversal and inversion symmetries, each band has an additional two-fold degeneracy, making the neck crossing-point of the hourglass four-fold degenerate...
November 29, 2017: Nature Communications
https://www.readbyqxmd.com/read/29176533/idiopathic-multifocal-choroiditis-presenting-with-a-transient-peripapillary-white-ring
#4
Sarra Gattoussi, Quraish Ghadiali, Rosa Dolz-Marco, K Bailey Freund
PURPOSE: We describe with multimodal imaging the presentation and follow-up for a patient with idiopathic multifocal choroiditis and a transient peripapillary white ring. METHODS: Case report. RESULTS: A 39-year-old Asian woman was initially seen for an evaluation of lattice degeneration in 2015. Her medical history included Graves disease and psoriasis. Best-corrected visual acuity was 20/25 in her right eye and 20/25 in her left eye. Ultra-widefield fundus autofluorescence imaging showed a curvilinear hyperautofluorescent line in her right eye...
November 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/29167506/creation-and-annihilation-of-skyrmions-in-the-frustrated-magnets-with-competing-exchange-interactions
#5
Yong Hu, Xiaodan Chi, Xuesi Li, Yan Liu, An Du
In triangular-lattice magnets, the coexistence of third-neighbor antiferromagnetic and nearest-neighbor ferromagnetic exchange interactions can induce rich magnetic phases including noncoplanar skyrmion crystals. Based on Monte Carlo simulation, we studied the dependence of magnetic phase transition on exchange interaction strength. Under the consideration of uniaxial anisotropy and magnetic field both perpendicular to the film plane, a large antiferromagnetic exchange interaction induces a high frustration...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29164213/strain-induced-alignment-and-phase-behavior-of-blue-phase-liquid-crystals-confined-to-thin-films
#6
Emre Bukusoglu, Jose A Martinez-Gonzalez, Xiaoguang Wang, Ye Zhou, Juan J de Pablo, Nicholas L Abbott
We report on the influence of surface confinement on the phase behavior and strain-induced alignment of thin films of blue phase liquid crystals (BPs). Confining surfaces comprised of bare glass, dimethyloctadecyl [3-(trimethoxysilyl)propyl] ammonium chloride (DMOAP)-functionalized glass, or polyvinyl alcohol (PVA)-coated glass were used with or without mechanically rubbing to influence the azimuthal anchoring of the BPs. These experiments reveal that confinement can change the phase behavior of the BP films...
November 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/29134946/prediction-of-phonon-mediated-superconductivity-in-hole-doped-black-phosphorus
#7
Yanqing Feng, Hong Xi Sun, Junhui Sun, Zhibin Lu, Yong You
We study the conventional electron--phonon mediated superconducting properties of hole-doped Black Phosphorus by density functional calculations and get a quite large electron--phonon coupling (EPC) constant λ ~ 1.0 with transition temperature TC ~ 10 K, which is comparable to MgB2 when holes are doped into degenerate and nearly flat energy bands around the Fermi level. We predict that the softening of low-frequency B3g1 optical mode and its phonon displacement which breaks the lattice nonsymmorphic symmetry of gliding plane and lifts the band double degeneracy, lead to a large EPC...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29109306/hierarchy-and-scaling-behaviour-of-multi-rank-domain-patterns-in-ferroelectric-k-sub-0-9-sub-na-sub-0-1-sub-nbo-sub-3-sub-strained-films
#8
Dorothee Braun, Martin Schmidbauer, Michael Hanke, Jutta Schwarzkopf
The formation process of a ferroelectric multi-rank domain pattern in the thickness range of 7 to 52 nm is investigated for monoclinic K<sub>0.9</sub>Na<sub>0.1</sub>NbO<sub>3</sub> strained epitaxial films on (110) NdScO<sub>3</sub> substrates. Although the elastic strain energy density is degenerated for two pseudocubic orientations, a distinctive hierarchy of domain evolution is observed with exclusive in-plane a<sub>1</sub>a<sub>2</sub> domains for very thin films and the retarded onset of a ferroelectric M<sub>C</sub> phase at larger film thickness...
November 7, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29071275/reactive-retinal-astrocytic-tumor-focal-nodular-gliosis-report-of-the-clinical-spectrum-of-3-cases
#9
Arun D Singh, Hansell Soto, Claudine Bellerive, Charles V Biscotti
PURPOSE: To report 3 cases providing insight into clinical progression of reactive retinal astrocytic tumor. METHODS: The clinical, imaging, and when available, the cytologic features of 3 cases of reactive retinal astrocytic tumor (focal nodular gliosis) were reviewed. RESULTS: A 6-year-old female, a 49-year-old man, and a 39-year-old man each developed a white retinal mass associated with laser photocoagulation, lattice degeneration, and treatment of a presumed vascular tumor, respectively...
September 2017: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/29053316/nucleon-spin-and-momentum-decomposition-using-lattice-qcd-simulations
#10
C Alexandrou, M Constantinou, K Hadjiyiannakou, K Jansen, C Kallidonis, G Koutsou, A Vaquero Avilés-Casco, C Wiese
We determine within lattice QCD the nucleon spin carried by valence and sea quarks and gluons. The calculation is performed using an ensemble of gauge configurations with two degenerate light quarks with mass fixed to approximately reproduce the physical pion mass. We find that the total angular momentum carried by the quarks in the nucleon is J_{u+d+s}=0.408(61)_{stat}(48)_{syst} and the gluon contribution is J_{g}=0.133(11)_{stat}(14)_{syst}, giving a total of J_{N}=0.54(6)_{stat}(5)_{syst} that is consistent with the spin sum...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29049029/diffusion-of-interstitials-in-metallic-systems-illustration-of-a-complex-study-case-aluminum
#11
Matthieu David, Damien Connétable
While diffusion mechanisms of interstitial elements in fcc systems are generally well-known, especially in the case of H atoms, we show in this work that even in the case of a simple metallic system (aluminum), the diffusion of interstitials exhibits a wide variety of paths and mechanisms that depend on the specie. We used an approach based on first-principles calculations associated with kinetic Monte-Carlo simulations and a multi-state diffusion formalism to compute the diffusion coefficients of five interstitial elements: hydrogen, boron, carbon, nitrogen and oxygen...
October 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29041126/generation-of-v-point-polarization-singularity-lattices
#12
Ruchi, Sushanta Kumar Pal, P Senthilkumaran
V-points normally do not occur in generic light fields as compared to C-points and L-lines. In structured optical fields, simultaneous existence of C-points, V-points and L-lines can be engineered in lattice forms. But lattices consisting only of V-points have not been realized so far. In this paper we demonstrate creation of lattices of V-point polarization singularities with translational periodicity. These lattice structures are obtained by the interference of four (six) linearly polarized plane waves arranged in symmetric umbrella geometry...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29020432/acquired-nonpigmented-vitreous-cyst-associated-with-lattice-degeneration
#13
Jing Lu, Guiying Mai, Ruyuan Liu, Yan Luo, Lin Lu
A 63-year-old male presented with a round-shaped floater and visual obscuration in the right eye. Clinical evaluation showed a nonpigmented vitreous cyst connected to a lattice degeneration by a stalk. Immunostaining of the vitreous cyst obtained from vitrectomy showed its origin of retinal neuroepithelium. The cyst was formed by continuous vitreous traction, which might tear up the disrupted retina at the area of lattice degeneration. This report added the lattice degeneration to the list of causes for the acquired vitreous cyst...
October 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28983047/a-fermi-degenerate-three-dimensional-optical-lattice-clock
#14
S L Campbell, R B Hutson, G E Marti, A Goban, N Darkwah Oppong, R L McNally, L Sonderhouse, J M Robinson, W Zhang, B J Bloom, J Ye
Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor of 4 × 10(17) Previously, atomic interactions have forced a compromise between clock stability, which benefits from a large number of atoms, and accuracy, which suffers from density-dependent frequency shifts. Here we demonstrate a scalable solution that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts...
October 6, 2017: Science
https://www.readbyqxmd.com/read/28976645/niobium-doped-lanthanum-strontium-ferrite-as-a-redox-stable-and-sulfur-tolerant-anode-for-solid-oxide-fuel-cells
#15
Zhe Lü, Jingwei Li, Bo Wei, Zhiqun Cao, Xing Yue, Yaxin Zhang
A novel Nb-doped lanthanum strontium ferrite perovskite oxide La0.8Sr0.2Fe0.9Nb0.1O3-δ (LSFNb) is evaluated as anode material of solid oxide fuel cell (SOFC). The effects of Nb partial substitution on the crystal structure, electrical conductivity and valence of Fe ions are studied. A good structural stability of LSFNb in severe reducing atmosphere at 800 °C is found, suggesting that high valent Nb can effectively promote the stability of lattice structure. The ratio of Fe2+ increases after Nb doping as confirmed by the results of XPS...
October 4, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28960181/a-bird-s-eye-view-on-the-flat-and-conic-band-world-of-the-honeycomb-and-kagome-lattices-towards-an-understanding-of-2d-metal-organic-frameworks-electronic-structure
#16
Cyrille Barreteau, Francois Ducastelle, Talal Mallah
We present thorough tight-binding analysis of the band structure of a wide variety of lattices belonging to the class of honeycomb and Kagome systems including several mixed forms combining both lattices. The band structure of these systems are made of a combination of dispersive and flat bands. The dispersive bands possess Dirac cones (linear dispersion) at the six corners (K points) of the Brillouin zone although in peculiar cases Dirac cones at the center of the zone $(\Gamma$ point) appear. The flat bands can be of different nature...
September 29, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28945968/nature-of-interlayer-binding-and-stacking-of-sp-sp-2-hybridized-carbon-layers-a-quantum-monte-carlo-study
#17
Hyeondeok Shin, Jeongnim Kim, Hoonkyung Lee, Olle Heinonen, Anouar Benali, Yongkyung Kwon
α-Graphyne is a two-dimensional sheet of sp-sp(2) hybridized carbon atoms in a honeycomb lattice. While the geometrical structure is similar to that of graphene, the hybridized triple bonds give rise to electronic structure that is different from that of graphene. Similar to graphene, α-graphyne can be stacked in bilayers with two stable configurations, but the different stackings have very different electronic structures: one is predicted to have gapless parabolic bands, and the other, a tunable band gap which is attractive for applications...
October 9, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28936989/diffusion-of-interstitials-in-metallic-systems-illustration-of-a-complex-study-case-aluminum
#18
Matthieu David, Damien Connetable
While diffusion mechanisms of interstitial elements in fcc systems are generally well-known, especially in the case of H atoms, we show in this work that even in the case of a simple metallic system (aluminum), the diffusion of interstitials exhibits a wide variety of paths and mechanisms that depend on the specie. We used an approach based on first-principles calculations associated with kinetic Monte-Carlo simulations and a multi-state diffusion formalism to compute the diffusion coefficients of five interstitial elements: hydrogen, boron, carbon, nitrogen and oxygen...
September 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28883411/active-control-of-charge-density-waves-at-degenerate-semiconductor-interfaces
#19
Raj K Vinnakota, Dentcho A Genov
We present an optoelectronic switch for functional plasmonic circuits based on active control of Surface Plasmon Polaritons (SPPs) at degenerate PN(+)-junction interfaces. Self-consistent multi-physics simulations of the electromagnetic, thermal and IV characteristics of the device have been performed. The lattice matched Indium Gallium Arsenide (In0.53Ga0.47As) is identified as a better semiconductor material compared to Si for the practical implementation of the proposed optoelectronic switch providing higher optical confinement, reduced size and faster operation...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821848/reconfiguration-of-quantum-states-in-formula-see-text-symmetric-quasi-one-dimensional-lattices
#20
Jung-Wan Ryu, Nojoon Myoung, Hee Chul Park
We demonstrate mesoscopic transport through quantum states in quasi-1D lattices maintaining the combination of parity and time-reversal symmetries by controlling energy gain and loss. We investigate the phase diagram of the non-Hermitian system where transitions take place between unbroken and broken [Formula: see text]-symmetric phases via exceptional points. Quantum transport in the lattice is measured only in the unbroken phases in the energy band-but not in the broken phases. The broken phase allows for spontaneous symmetry-broken states where the cross-stitch lattice is separated into two identical single lattices corresponding to conditionally degenerate eigenstates...
August 18, 2017: Scientific Reports
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