Localized quasiholes and the Majorana fermion in fractional quantum Hall state at nu=5/2 via direct diagonalization

Using exact diagonalization in the spherical geometry, we investigate systems of localized quasiholes at nu=5/2 for interactions interpolating between the pure Coulomb and the three-body interaction for which the Moore-Read state is the exact ground state. We show that the charge e/4 quasihole can be easily localized by means of a delta-function pinning potential. Using a tuned smooth pinning potential, the quasihole radius can be limited to approximately three magnetic length units. For systems of two quasiholes, adiabatic continuity between the Moore-Read and the Coulomb limit holds for the ground state, while for four quasiholes, the lowest two energy states exhibit adiabatic continuity. This implies the existence of a Majorana fermion for pure Coulomb interaction. We also present preliminary results in the Coulomb limit for braiding in systems containing four quasiholes, with up to 14 electrons, diagonalizing in the full spin-polarized sector of the second Landau-level Hilbert space.Comment: 9 pages, 8 figure

Spin wave spectrum of the quantum ferromagnet on the pyrochlore lattice Lu2V2O7

Neutron inelastic scattering has been used to probe the spin dynamics of the quantum (S=1/2) ferromagnet on the pyrochlore lattice Lu2V2O7. Well-defined spin waves are observed at all energies and wavevectors, allowing us to determine the parameters of the Hamiltonian of the system. The data are found to be in excellent overall agreement with a minimal model that includes a nearest- neighbour Heisenberg exchange J = 8:22(2) meV and a Dzyaloshinskii-Moriya interaction (DMI) D =1:5(1) meV. The large DMI term revealed by our study is broadly consistent with the model developed by Onose et al. to explain the magnon Hall effect they observed in Lu2V2O7 [1], although our ratio of D=J = 0:18(1) is roughly half of their value and three times larger than calculated by ab initio methods [2].Comment: 5 pages, 4 figure

Birds, Montane forest, State of Rio de Janeiro, Southeastern Brazil

Field surveys in montane Atlantic forest of Rio de Janeiro state, Brazil, provided a list of 82 bird species in four sitesvisited. Our protocol relied on standardized use of mist nets and observations. The birds recorded include 40 Atlanticforest endemics, three globally and two nationally Vulnerable species, and two regionally Endangered species. Data onspecies elevation are included and discussed. This work enhances baseline knowledge of these species to assist futurestudies in these poorly understood, but biologically important areas

Good manufacturing practices in autologous chondrocyte implantation: the experience in a public hospital

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Spin-Orbit Interaction Enhanced Fractional Quantum Hall States in the Second Landau Level

We study the fractional quantum Hall effect at filling fractions 7/3 and 5/2 in the presence of the spin-orbit interaction, using the exact diagonalization method and the density matrix renormalization group (DMRG) method in a spherical geometry. Trial wave functions at these fillings are the Laughlin state and the Moore-Reed-Pfaffian state. The ground state excitation energy gaps and pair-correlation functions at fractional filling factor 7/3 and 5/2 in the second Landau level are calculated. We find that the spin-orbit interaction stabilizes the fractional quantum Hall states.Comment: 4pages, 4figure

Construir itinerarios : un aporte para estudiar la dinámica de los campos estatales

Como sostiene Bourdieu, las sociedades modernas se configuran en un proceso histórico de diferenciación de los diversos campos de actividad que construyen lógicas específicas que posibilitan su integración, organización y reproducción. Los campos poseen una dinámica interna que resulta de las luchas por la legitimidad y el poder hacia el interior de cada uno de ellos. Un campo es el juego de los movimientos en torno a determinados recursos sobre el terreno concreto de posibilidades actuales e históricas de construir ese recurso como forma de poder. Es el juego de la monopolización de lugares, de la competencia hacia el interior de los sectores dominantes y de la producción de la legitimidad en la relación con los sectores subalternos. Ahora bien, para dar cuenta de esas luchas por la apropiación del capital específico, de las formas en que se construye el poder al interior de los sectores dominantes (conocimiento fundamental para comprender la dinámica de los campos estatales) recurrimos a la noción de "itinerario". Este concepto permite poner en evidencia, el ser social; dimensión que busca superar las historias individuales y dar cuenta de la historia colectiva. Esta propuesta se basa en la noción de itinerarios biográficos desarrollada por Susana García Salord (2000, 2001) y la aplica a la reconstrucción de procesos históricos, poniendo el foco en las trayectorias y redes sociales de los agentes que participan de las luchas por la apropiación del capital en juego. Este recurso metodológico hace posible observar, distinguir, en los procesos históricos las distintas facciones que se imponen por periodos, más allá de las categorías en las que la historiografía local las coloca. El objetivo de esta ponencia es compartir un conjunto de reflexiones teórico metodológicas sobre las formas de construir la evidencia empírica requerida para dar cuenta de la dinámica de los campos sociales y, en particular, los estatales en el marco de una línea de trabajo que denominamos sociohistórica.Fil: Henríquez, María G.. Universidad Nacional de San Juan. Instituto de Investigaciones Socieconómicas.Fil: Martínez, Juan S.I.. Universidad Nacional de San Juan. Instituto de Investigaciones Socieconómicas.Fil: Storni, Silvia Susana . Universidad Nacional de San Juan. Instituto de Investigaciones Socieconómicas.Fil: Castilla, M. Josefina. Universidad Nacional de San Juan. Instituto de Investigaciones Socieconómicas

CARATTERIZZAZIONE GENOMICA DI CEPPI DI HELICOBACTER PYLORI CON L'IMPIEGO DELLE TECNICHE ERIC-PCR E REP-PCR.

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Types, obstacles and sources of empowerment in co-design: the role of shared material objects and processes

Co-design is intrinsically linked to the notion of empowerment, however little research has focussed specifically on understanding the types, obstacles and sources of empowerment in co-design. This paper combines theoretical investigations with observations derived from co-designed research by academic and non-academic partners to explore these issues, in particular, the role of shared material objects and processes in supporting empowerment during co-design. The paper uses the notions of ‘power over,’ ‘power to’, ‘power with’ and ‘power within’ to tease out different aspects of empowerment, and draws on empirical observations to determine different obstacles and sources associated with each. The study therefore makes a theoretical contribution to the understanding of co-design as an empowerment process and should be useful for design researchers undertaking co-design projects with non-experts