5,246 research outputs found
Entanglement in fermionic chains with finite range coupling and broken symmetries
We obtain a formula for the determinant of a block Toeplitz matrix associated
with a quadratic fermionic chain with complex coupling. Such couplings break
reflection symmetry and/or charge conjugation symmetry. We then apply this
formula to compute the Renyi entropy of a partial observation to a subsystem
consisting of contiguous sites in the limit of large . The present work
generalizes similar results due to Its, Jin, Korepin and Its, Mezzadri, Mo. A
striking new feature of our formula for the entanglement entropy is the
appearance of a term scaling with the logarithm of the size of . This
logarithmic behaviour originates from certain discontinuities in the symbol of
the block Toeplitz matrix. Equipped with this formula we analyse the
entanglement entropy of a Dzyaloshinski-Moriya spin chain and a Kitaev
fermionic chain with long range pairing.Comment: 27 pages, 5 figure
On the M\"obius transformation in the entanglement entropy of fermionic chains
There is an intimate relation between entanglement entropy and Riemann
surfaces. This fact is explicitly noticed for the case of quadratic fermionic
Hamiltonians with finite range couplings. After recollecting this fact, we make
a comprehensive analysis of the action of the M\"obius transformations on the
Riemann surface. We are then able to uncover the origin of some symmetries and
dualities of the entanglement entropy already noticed recently in the
literature. These results give further support for the use of entanglement
entropy to analyse phase transition.Comment: 29 pages, 5 figures. Final version published in JSTAT. Two new
figures. Some comments and references added. Typos correcte
Estrutura e dinâmica em uma floresta de várzea do Rio Amazonas no Estado do Amapá.
O Rio Amazonas; O braço norte do Rio Amazonas; A várzea do estuário amazônico; A floresta de várzea do estuário amazônico; Uso dos recursos da floresta de várzea do estuário; A estrutura da floresta de várzea do estuário; Distribuição diamétrica; A dinâmica da floresta de várzea do estuário; Dinâmica e sucessão florestal; Ingresso e recrutamento; Crescimento; Mortalidade; Descrição da área de estudos; Clima; Solo; Áreas da parte externa da Foz do Rio Amazonas; Vila Progresso - Bailique; Igarapé República; Rio Aracu - Foz do Rio Macacoari; Áreas da parte interna da Foz do Rio Amazonas; Furo do Mazagão; Rio Mutuacá; Rio Maniva - Ilha do Pará; Análise da estrutura da floresta; Estrutura da floresta; Composição florística; Densidade, dominância, frequência e valor de importância; Distribuição espacial das espécies; Diversidadde de espécies; Quociente de mistura; Importância sócio-econômica da floresta em estudo; O manejo dos açaizais; O manejo das espécies arbóreas; O manejo das espécies oleaginosas.Tese (Doutorado em Ciências Florestais) - Universidade Federal do Paraná, Curitiba
Germinação de sementes de bacabinha (Oenocarous mapora Karsten).
O presente trabalho foi conduzido no Campo Experimental de Fazendinha, com o objetivo de avaliar métodos para acelerar e uniformizar a germinação de sementes de bacabi.bitstream/item/97468/1/CPAF-AP-2000-Sementes-bacabinha.pd
Logarithmic corrections to gap scaling in random-bond Ising strips
Numerical results for the first gap of the Lyapunov spectrum of the self-dual
random-bond Ising model on strips are analysed. It is shown that finite-width
corrections can be fitted very well by an inverse logarithmic form, predicted
to hold when the Hamiltonian contains a marginal operator.Comment: LaTeX code with Institute of Physics macros for 7 pages, plus 2
Postscript figures; to appear in Journal of Physics A (Letter to the Editor
Connectivity-dependent properties of diluted sytems in a transfer-matrix description
We introduce a new approach to connectivity-dependent properties of diluted
systems, which is based on the transfer-matrix formulation of the percolation
problem. It simultaneously incorporates the connective properties reflected in
non-zero matrix elements and allows one to use standard random-matrix
multiplication techniques. Thus it is possible to investigate physical
processes on the percolation structure with the high efficiency and precision
characteristic of transfer-matrix methods, while avoiding disconnections. The
method is illustrated for two-dimensional site percolation by calculating (i)
the critical correlation length along the strip, and the finite-size
longitudinal DC conductivity: (ii) at the percolation threshold, and (iii) very
near the pure-system limit.Comment: 4 pages, no figures, RevTeX, Phys. Rev. E Rapid Communications (to be
published
Efeito do tamanho do recipiente sobre o desenvolvimento de mudas de copaíba (Copaifera spp.).
O trabalho objetiva estudar o efeito de diferentes tamanhos de recipientes sobre o desenvolvimento de mudas de copaíba.bitstream/item/96287/1/CPAF-AP-2001-Efeito-Copaiba.pd
Efeito do tamanho do recipiente sobre o desenvolvimento de mudas de macacaúba da várzea (Platymiscium ulei Harms).
Este trabalho foi realizado com o objetivo de avaliar o efeito do tamanho do recipiente sobre o desenvolvimento de mudas de macacaúba da várzea, para a produção em viveiro.bitstream/item/96272/1/CPAF-AP-2001-Mudas-Macacauba.pd
Smoothly-varying hopping rates in driven flow with exclusion
We consider the one-dimensional totally asymmetric simple exclusion process
(TASEP) with position-dependent hopping rates. The problem is solved,in a mean
field/adiabatic approximation, for a general (smooth) form of spatial rate
variation. Numerical simulations of systems with hopping rates varying linearly
against position (constant rate gradient), for both periodic and open boundary
conditions, provide detailed confirmation of theoretical predictions,
concerning steady-state average density profiles and currents, as well as
open-system phase boundaries, to excellent numerical accuracy.Comment: RevTeX 4.1, 14 pages, 9 figures (published version
Surface crossover exponent for branched polymers in two dimensions
Transfer-matrix methods on finite-width strips with free boundary conditions
are applied to lattice site animals, which provide a model for randomly
branched polymers in a good solvent. By assigning a distinct fugacity to sites
along the strip edges, critical properties at the special (adsorption) and
ordinary transitions are assessed. The crossover exponent at the adsorption
point is estimated as , consistent with recent
predictions that exactly for all space dimensionalities.Comment: 10 pages, LaTeX with Institute of Physics macros, to appear in
Journal of Physics
- …