From conformal to volume-law for the entanglement entropy in exponentially deformed critical spin 1/2 chains

An exponential deformation of 1D critical Hamiltonians gives rise to ground states whose entanglement entropy satisfies a volume-law. This effect is exemplified in the XX and Heisenberg models. In the XX case we characterize the crossover between the critical and the maximally entangled ground state in terms of the entanglement entropy and the entanglement spectrum.Comment: Accepted for the Special Issue: Quantum Entanglement in Condensed Matter Physics. 11 pages, 9 figures (with enhanced size to focus on the details) and new reference

Entanglement in low-energy states of the random-hopping model

We study the low-energy states of the 1D random-hopping model in the strong disordered regime. The entanglement structure is shown to depend solely on the probability distribution for the length of the effective bonds $P(l_b)$, whose scaling and finite-size behavior are established using renormalization-group arguments and a simple model based on random permutations. Parity oscillations are absent in the von Neumann entropy with periodic boundary conditions, but appear in the higher moments of the distribution, such as the variance. The particle-hole excited states leave the bond-structure and the entanglement untouched. Nonetheless, particle addition or removal deletes bonds and leads to an effective saturation of entanglement at an effective block size given by the expected value for the longest bond

Nuevo correo para alumnos: más capacidad, mejor acceso

El correo de los alumnos de la UC3M ha cambiado. Desde el 6 de mayo ha pasado al gestor de google, es decir, al sistema gmail. De esta forma, los correos tienen más capacidad y mejor acceso móvil

Resizing study of main and auxiliary engines of the container vessels and their contribution to the reduction of fuel consumption and GHG

ABSTRACT: The maritime industry has great potential for improving energy efficiency in both new builds and existing ships. It is, therefore, necessary to identify the areas where improvements can be made to reduce fuel consumption, and influence to the shipowners, shipyards and designers of ships on the need to implement these improvements in energetic efficiency and to achieve a reduction of between 25% and 75% of CO2 emissions as Third IMO GHG study 2014 provides, making ships even more environmentally friendly.Postprint (published version

Proyecto de Construcción: Variante oeste de Zafra. Tramo: EX 101 a N 432. Provincia de Badajoz

El presente proyecto tiene por objeto la definición y valoración de todas las obras necesarias para la realización del “Proyecto de Construcción. Variante oeste de Zafra. Tramo EX 101 a N 432.Provincia de Badajoz”.Universidad de Sevilla. Máster en Ingeniería de Caminos, Canales y Puerto

Compromiso cardiovascular en la infección por el virus de inmunodeficiencia humana

Human immunodeficiency virus (HIV) infection was associated with increased morbidity and mortality, predominantly for opportunistic infections, before using antiretroviral therapy. With this, patients have experienced increased survival and cardiovascular compromise too. The etiology of these clinical conditions could be related to the infection itself, adverse events associated with antiretroviral therapy, or adverse events produced by the combination with other drugs. Some of these conditions have an acute onset, and their rapid recognition is vital for a better prognosis.La infección por el virus de inmunodeficiencia humana (VIH) estuvo asociada a un incremento de la morbimortalidad predominantemente por infecciones oportunistas en la época previa al uso de la terapia antirretroviral. Con ella, los pacientes han experimentado un incremento de la sobrevida, pero también del compromiso cardiovascular. La etiología de estas condiciones clínicas puede estar relacionada con la infección por sí misma, con eventos adversos de la terapia antirretroviral o con los eventos adversos producidos al combinarse con otros fármacos. Algunas de estas condiciones tienen un inicio agudo, por tanto, su rápido reconocimiento es clave para un mejor pronóstico