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lattice degeneration

S S Naghavi, M Fabrizio, T Qin, E Tosatti
The quantum physics of ions and electrons behind low-energy spectra of strongly correlated molecular conductors, superconductors and Mott insulators is poorly known, yet fascinating especially in orbitally degenerate cases. The fulleride insulator Cs3C60 (A15), one such system, exhibits infrared (IR) spectra with low temperature peak features and splittings suggestive of static Jahn-Teller distortions with a breakdown of orbital symmetry in the molecular site. That is puzzling, since there is no detectable static distortion, and because the features and splittings disappear upon modest heating, which they should not...
October 14, 2016: Nanoscale
David J Mathew, Saurabh Kumar Sarma, Jennifer V Basaiawmoit
Lattice degeneration of the retina is not infrequently encountered on a dilated retinal examination and many of them do not need any intervention. We report a case of atypical lattice degeneration variant with peripheral retinal detachment. An asymptomatic 35-year-old lady with minimal refractive error was found to have extensive lattice degeneration, peripheral retinal detachment and fibrotic changes peripherally with elevation of retinal vessels on dilated retinal examination. There were also areas of white without pressure, chorioretinal scarring and retinal breaks...
July 2016: Journal of Clinical and Diagnostic Research: JCDR
W Zhu, Shou-Shu Gong, Tian-Sheng Zeng, Liang Fu, D N Sheng
Topological states of matter have been widely studied as being driven by an external magnetic field, intrinsic spin-orbital coupling, or magnetic doping. Here, we unveil an interaction-driven spontaneous quantum Hall effect (a Chern insulator) emerging in an extended fermion-Hubbard model on a kagome lattice, based on a state-of-the-art density-matrix renormalization group on cylinder geometry and an exact diagonalization in torus geometry. We first demonstrate that the proposed model exhibits an incompressible liquid phase with doublet degenerate ground states as time-reversal partners...
August 26, 2016: Physical Review Letters
Milton A Tumelero, Ricardo Faccio, Andre A Pasa
Bi2Se3 is a prominent narrow gap semiconductor with a rhombohedral crystal structure and potential applications in thermoelectric and spintronic technologies. Its electrical conduction is ruled by native point defects inducing an n-type degenerate behavior. Here, we present a first principles study of the point defects in Bi2Se3, focusing on the relevance of the interstitial sites. A density functional methodology was employed with van der Waals correction and spin-orbit coupling in order to achieve a better description of the defects...
October 26, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Gabriel Mazzucchi, Santiago F Caballero-Benitez, Igor B Mekhov
Ultracold atomic systems offer a unique tool for understanding behavior of matter in the quantum degenerate regime, promising studies of a vast range of phenomena covering many disciplines from condensed matter to quantum information and particle physics. Coupling these systems to quantized light fields opens further possibilities of observing delicate effects typical of quantum optics in the context of strongly correlated systems. Measurement backaction is one of the most funda- mental manifestations of quantum mechanics and it is at the core of many famous quantum optics experiments...
2016: Scientific Reports
Yasser Helmy Mohamed, Kozue Ono, Hirofumi Kinoshita, Masafumi Uematsu, Eiko Tsuiki, Azusa Fujikawa, Takashi Kitaoka
Aim. To investigate the anatomical success rates of pars plana vitrectomy (PPV) after primary rhegmatogenous retinal detachment (RRD). Methods. This retrospective study was conducted between December 2008 and October 2014 at Nagasaki University Hospital. The preoperative data recorded included the lens status, location of the retinal tear, whether a tear was visualized, presence of multiple tears, macula status, presence of peripheral lattice retinal degeneration, and best-corrected visual acuity (BCVA). The primary outcome measures were anatomical (primary and final) and functional success (visual acuity better than 6/60)...
2016: Journal of Ophthalmology
Rudro R Biswas, Dam Thanh Son
The quest for universal properties of topological phases is fundamentally important because these signatures are robust to variations in system-specific details. Aspects of the response of quantum Hall states to smooth spatial curvature are well-studied, but challenging to observe experimentally. Here we go beyond this prevailing paradigm and obtain general results for the response of quantum Hall states to points of singular curvature in real space; such points may be readily experimentally actualized. We find, using continuum analytical methods, that the point of curvature binds an excess fractional charge and sequences of quantum states split away, energetically, from the degenerate bulk Landau levels...
August 2, 2016: Proceedings of the National Academy of Sciences of the United States of America
Yi-Yang Sun, Shengbai Zhang
Bulk black phosphorus has two optical phonon modes labeled as Ag (2) and B2u, respectively, that are nearly degenerate in frequency. However, density functional theory calculations using local or semi-local functionals cannot reproduce this degeneracy. Here, we propose a hybrid functional approach aided by van der Waals (vdW) force fields, which can accurately describe the lattice dynamic and electronic properties of both bulk and few-layer black phosphorus (phosphorene). Using this approach we show that in bilayer phosphorene, the two Raman modes derived from the B2u and Ag (2) modes could exhibit strong resonance as a result of the accidental degeneracy so that both modes could be observed in Raman experiment...
July 14, 2016: Journal of Chemical Physics
A Abdel-Rehim, C Alexandrou, M Constantinou, K Hadjiyiannakou, K Jansen, Ch Kallidonis, G Koutsou, A Vaquero Avilés-Casco
We evaluate the light, strange, and charm scalar content of the nucleon using one lattice QCD ensemble generated with two degenerate light quarks with mass fixed to their physical value. We use improved techniques to evaluate the disconnected quark loops to sufficient accuracy to determine the strange and charm nucleon σ terms in addition to the light quark content σ_{πN}. We find σ_{πN}=37.2(2.6)(4.7/2.9)  MeV, σ_{s}=41.1(8.2)(7.8/5.8)  MeV, and σ_{c}=79(21)(12/8)  MeV, where the first error is statistical and the second is the systematic error due to the determination of the lattice spacing, the assessment of finite volume, and residual excited state effects...
June 24, 2016: Physical Review Letters
Johan Carlström, Nikolay Prokof'ev, Boris Svistunov
We study the propagation of a hole in degenerate (paramagnetic) spin environments. This canonical problem has important connections to a number of physical systems, and is perfectly suited for experimental realization with ultracold atoms in an optical lattice. At the short-to-intermediate time scale that we can access using a stochastic-series-type numeric scheme, the propagation turns out to be distinctly nondiffusive with the probability distribution featuring minima in both space and time due to quantum interference, yet the motion is not ballistic, except at the beginning...
June 17, 2016: Physical Review Letters
Mantas Šimėnas, Sergejus Balčiūnas, Mirosław Ma Combining Cedilla Czka, Jūras Banys, Evaldas E Tornau
We propose a combined experimental and numerical study to describe an order-disorder structural phase transition in perovskite-based [(CH3)2NH2][M(HCOO)3] (M = Zn(2+), Mn(2+), Fe(2+), Co(2+) and Ni(2+)) dense metal-organic frameworks (MOFs). The three-fold degenerate orientation of the molecular (CH3)2NH2(+) (DMA(+)) cation implies a selection of the statistical three-state model of the Potts type. It is constructed on a simple cubic lattice where each lattice point can be occupied by a DMA(+) cation in one of the available states...
July 21, 2016: Physical Chemistry Chemical Physics: PCCP
Tadashi Orihara, Kazunari Hirota, Reiji Yokota, Daisuke Kunita, Yuji Itoh, Tosho Rii, Takashi Koto, Tomoyuki Hiraoka, Makoto Inoue, Akito Hirakata
PURPOSE: To evaluate clinical characteristics of rhegmatogenous retinal detachment in high myopic and phakic eyes. SUBJECTS AND METHOD: The subjects were 1174 eyes of phakic rhegmatogenous retinal detachment detected in 1199 eyes that underwent initial vitreoretinal surgery between April 2006 and March 2011. Eyes with macular hole retinal detachment or secondary retinal detachment were excluded. The 486 eyes with high myopia (spherical equivalent ≤ -6.0 D or axial length ≥ 26...
May 2016: Nippon Ganka Gakkai Zasshi
Hassan Chamati, Silvano Romano
In a previous paper [Phys. Rev. E 90, 022506 (2014)PLEEE81539-375510.1103/PhysRevE.90.022506], we studied the thermodynamic and structural properties of a three-dimensional simple-cubic lattice model with dipolarlike interaction, truncated at nearest-neighbor separation, for which the existence of an ordering transition at finite temperature had been proven mathematically; here we extend our investigation, addressing the full-ranged counterpart of the model, for which the critical behavior had been investigated theoretically and experimentally...
May 2016: Physical Review. E
Haifa A Madi, Richard J Haynes, Diana Depla, Morten D de la Cour, Sarit Lesnik-Oberstein, Mahi M K Muqit, Niall Patton, Nick Price, David H W Steel
PURPOSE: To describe the characteristics and outcomes of patients presenting with rhegmatogenous retinal detachment (RRD) after ocriplasmin (OCP) injection. METHODS: Retrospective, multi-centre, observational case series with case note review. RESULTS: Eight patients with symptomatic vitreomacular traction (six with concomitant macular hole) were diagnosed with RRD after a median of 16 days (range 3-131 days) post-OCP injection. Presentation was within 3 weeks of the OCP injection in six of the cases...
June 8, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
Steffen Weimann, Luis Morales-Inostroza, Bastián Real, Camilo Cantillano, Alexander Szameit, Rodrigo A Vicencio
We investigate, theoretically and experimentally, a photonic realization of a Sawtooth lattice. This special lattice exhibits two spectral bands, with one of them experiencing a complete collapse to a highly degenerate flat band for a special set of inter-site coupling constants. We report the observation of different transport regimes, including strong transport inhibition due to the appearance of the non-diffractive flat band. Moreover, we excite localized Shockley surface states residing in the gap between the two linear bands...
June 1, 2016: Optics Letters
Jay A Switzer, James C Hill, Naveen K Mahenderkar, Ying-Chau Liu
Single-crystal Au is an excellent substrate for electrochemical epitaxial growth due to its chemical inertness, but the high cost of bulk Au single crystals prohibits their use in practical applications. Here, we show that ultrathin epitaxial films of Au electrodeposited onto Si(111), Si(100), and Si(110) wafers can serve as an inexpensive proxy for bulk single-crystal Au for the deposition of epitaxial films of cuprous oxide (Cu2O). The Au films range in thickness from 7.7 nm for a film deposited for 5 min to 28...
June 22, 2016: ACS Applied Materials & Interfaces
Jinglin Zhang, Yonghao Li, Xiujuan Zhao, Yu Cai, Xiling Yu, Lin Lu
BACKGROUND: The purpose is to investigate the relationship between full-thickness macular hole (MH) and retinal break (RB) and/or lattice degeneration. METHODS: Patients diagnosed as full-thickness MH and referred to Dr. Lin Lu from January 2009 to December 2013 were evaluated. All patients underwent general ophthalmologic examinations, fundus examination and optical coherence tomography (OCT). The RB and/or lattice degeneration were recorded. RESULTS: Totally 183 eyes of 167 patients were included...
December 2015: Eye Science
Uriel Rubin, Cornelis De Jager, Moayed Zakour, J Thomas Gonder
BACKGROUND/PURPOSE: To present a case of a patient with simultaneous bilateral retinal detachments treated successfully with bilateral pneumatic retinopexy. STUDY DESIGN: Case report. RESULTS: This is a case of an otherwise healthy 49-year-old woman with no remarkable ocular history that presented with simultaneous phakic superior bilateral rhegmatogenous retinal detachments. Treatment on the day of presentation included laser retinopexy of the inferior lattice degeneration in the left eye and bilateral intravitreal injection of 0...
May 5, 2016: Retinal Cases & Brief Reports
Mingqiang Gu, James M Rondinelli
We report a dynamic structure and band engineering strategy with experimental protocols to induce indirect-to-direct band gap transitions and coherently oscillating pure spin-currents in three-dimensional antiferromagnets (AFM) using selective phononic excitations. In the Mott insulator LaTiO3, we show that a photo-induced nonequilibrium phonon mode amplitude destroys the spin and orbitally degenerate ground state, reduces the band gap by 160 meV and renormalizes the carrier masses. The time scale of this process is a few hundreds of femtoseconds...
2016: Scientific Reports
Irene Rusu, Mrinali Patel Gupta, Samir N Patel, Erica Oltra, R V Paul Chan
We report the case of a 2-month-old girl with Dandy-Walker variant who presented with strabismus, pathologic myopia measuring -16.00 D in each eye, diffuse chorioretinal atrophy and pigment mottling in the macula of both eyes, and areas of retinal capillary nonperfusion in both eyes. The patient's brother also has Dandy-Walker variant and was found to have bilateral severe myopia, myopic fundi, tilted optic disks with peripapillary atrophy, extensive areas of white without pressure, areas of lattice degeneration, and several chronic-appearing atrophic retinal holes surrounded by pigmentation...
April 2016: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
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