20 research outputs found

    Photo-electrons unveil topological transitions in graphene-like systems

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    The topological structure of the wavefunctions of particles in periodic potentials is characterized by the Berry curvature 惟kn whose integral on the Brillouin zone is a topological invariant known as the Chern number. The bulk-boundary correspondence states that these numbers define the number of edge or surface topologically protected states. It is then of primary interest to find experimental techniques able to measure the Berry curvature. However, up to now, there are no spectroscopic experiments that proved to be capable to obtain information on 惟kn to distinguish different topological structures of the bulk wavefunctions of semiconducting materials. Based on experimental results of the dipolar matrix elements for graphene, here we show that ARPES experiments with the appropriate x-ray energies and polarization can unambiguously detect changes of the Chern numbers in dynamically driven graphene and graphene-like materials opening new routes towards the experimental study of topological properties of condensed matter systems.Fil: Peralta Gavensky, Lucila. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); ArgentinaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; Argentin

    Time-resolved Hall conductivity of pulse-driven topological quantum systems

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    We address the question of how the time-resolved bulk Hall response of a two-dimensional honeycomb lattice develops when driving the system with a pulsed perturbation. A simple toy model that switches a valley Hall signal by breaking inversion symmetry is studied in detail for slow quasiadiabatic ramps and sudden quenches, obtaining an oscillating dynamical response that depends strongly on doping and time-averaged values that are determined both by the out of equilibrium occupations and the Berry curvature of the final states. On the other hand, the effect of irradiating the sample with a circularly-polarized pump pulse that breaks time reversal symmetry and thus ramps the system into a nontrivial topological regime is probed. Even though there is a nonquantized average signal due to the breakdown of the Floquet adiabatical picture, some features of the photon-dressed topological bands are revealed to be present even in a few femtosecond timescale. Small frequency oscillations during the transient response evidence the emergence of dynamical Floquet gaps which are consistent with the instantaneous amplitude of the pump envelope. On the other hand, a characteristic heterodyning effect is manifested in the model. The presence of a remnant Hall response for ultrashort pulses that contain only a few periods of the radiation field is briefly discussed.Fil: Peralta Gavensky, Lucila. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del Area de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del Area de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del Area de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; Argentin

    Topological phase diagram of a three-terminal Josephson junction: From the conventional to the Majorana regime

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    We study the evolution of averaged transconductances in three-terminal Josephson junctions when the superconducting leads are led throughout a topological phase transition from an s-wave to a p-wave (Majorana) phase by an in-plane magnetic field Bx. We provide a complete description of this transition as a function of Bx and a magnetic flux 蠁 threading the junction. For that we use a spinful model within a formalism that allows us to treat on an equal footing the contribution to the transconductance from both the Andreev subgap levels and the continuum spectrum. We unveil a fractionalization in the quantization of the transconductance due to the presence of Majorana quasiparticles, reflecting the effective pumping of half a Cooper pair charge in the p-wave regime.Fil: Peralta Gavensky, Lucila. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; ArgentinaFil: Usaj, Gonzalo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; ArgentinaFil: Balseiro, Carlos Antonio. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentin

    Majorana fermions on the quantum Hall edge

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    Superconductivity and the quantum Hall effect are considered to be two cornerstones of condensed matter physics. The realization of hybrid structures where these two effects coexist has recently become an active field of research. In this work, we study a Josephson junction where a central region in the quantum Hall regime is proximitized with superconductors that can be driven to a topological phase with an external Zeeman field. In this regime, the Majorana modes that emerge at the ends of each superconducting lead couple to the chiral quantum Hall edge states. This produces distinguishable features in the Andreev levels and Fraunhofer patterns that could help in detecting not only the topological phase transition but also the spin degree of freedom of these exotic quasiparticles. The current phase relation and the spectral properties of the junction throughout the topological transition are fully described by a numerical tight-binding calculation. In pursuance of the understanding of these results, we develop a low-energy spinful model that captures the main features of the numerical transport simulations in the topological phase.Fil: Peralta Gavensky, Lucila. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; ArgentinaFil: Usaj, Gonzalo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; ArgentinaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentin

    Berry curvature tomography and realization of topological Haldane model in driven three-terminal Josephson junctions

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    We propose a protocol to locally detect the Berry curvature of the ground state of a three-terminal Josephson junction with a quantum dot based on a synchronic detection of the currents flowing into the reservoir leads when an ac modulation is applied in the device. This local gauge invariant quantity is expressed in terms of the instantaneous Green鈥檚 function of the Bogoliubov鈥揹e Gennes Hamiltonian, and thus correctly accounts for the topological contribution from both the quasiparticle continuum and the Andreev bound states of the junction. We analyze the contribution to the Berry curvature from the latter by introducing an effective low-energy model. In addition, we propose to induce topological properties in the system by breaking time-reversal symmetry with a microwave field in the large frequency nonresonant regime. In the last case, the Floquet-Andreev levels are the ones that determine the topological structure of the junction, which is formally equivalent to a two-dimensional honeycomb Haldane lattice and provides a realization of this celebrated model in a solid state device. A relation between the Floquet Berry curvature and the transconductance of the driven system is derived.Fil: Peralta Gavensky, Lucila. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Feinberg, D.. Centre National de la Recherche Scientifique; Francia. Universite Grenoble Alpes; FranciaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; Argentin

    Population inversion and dynamical phase transitions in a driven superconductor

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    We consider a superconductor in which the density of states at the Fermi level or the pairing interaction is driven periodically with a frequency larger than the superconducting gap in the collisionless regime. We show by numerical and analytical computations that a subset of quasiparticle excitations enter into resonance and perform synchronous Rabi oscillations leading to cyclic population inversion with a frequency that depends on the amplitude of the drive. As a consequence a different "Rabi-Higgs" mode emerges. Turning off the drive at different times and modulating the strength allows access to all known dynamical phases of the order parameter: persistent oscillations, oscillations with damping and overdamped dynamics. We discuss physical realizations of the drive and methods to detect the dynamics.Fil: Ojeda Collado, Hector Pablo. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Lorenzana, Jos茅. Universit脿 degli studi di Roma "La Sapienza"; ItaliaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; ArgentinaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Patagonia Norte; Argentin

    Fate of dynamical phases of a BCS superconductor beyond the dissipationless regime

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    The BCS model of an isolated superconductor initially prepared in a nonequilibrium state predicts the existence of interesting dynamical phenomena in the time-dependent order parameter as decaying oscillations, persistent oscillations, and overdamped dynamics. To make contact with real systems remains an open challenge as one needs to introduce dissipation due to the environment in a self-consistent computation. Here, we reach this goal with the use of the Keldysh formalism to treat the effect of a thermal bath. We show that, contrary to the dissipationless case, all dynamical phases reach the equilibrium order parameter in a characteristic time that depends on the coupling with the bath. Remarkably, as time evolves, the overdamped phase shows a fast crossover where the superconducting order parameter recovers to reach a state with a well-developed long range order that tends towards equilibrium with the damped Higgs mode oscillations. Our results provide a benchmark for the description of the dynamics of real out-of-equilibrium superconductors relevant for quantum technological applications.Fil: Ojeda Collado, Hector Pablo. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; ArgentinaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Oficina de Coordinaci贸n Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a - Nodo Bariloche | Comisi贸n Nacional de Energ铆a At贸mica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a - Nodo Bariloche; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; ArgentinaFil: Lorenzana, Jos茅. Universit脿 degli studi di Roma "La Sapienza"; ItaliaFil: Balseiro, Carlos Antonio. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Bariloche; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Oficina de Coordinaci贸n Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a - Nodo Bariloche | Comisi贸n Nacional de Energ铆a At贸mica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a. Unidad Ejecutora Instituto de Nanociencia y Nanotecnolog铆a - Nodo Bariloche; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentin

    Quantum Hall edge states under periodic driving: A Floquet induced chirality switch

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    We report on the fate of the quantum Hall effect in graphene under intense laser illumination. By using Floquet theory combined with both a low energy description and full tight-binding models, we clarify the selection rules, the quasienergy band structure, as well as their connection with the two-terminal and multiterminal conductance in a device setup as relevant for experiments. We show that the well-known dynamical gaps that appear in the Floquet spectrum at 卤 蠅/2 lead to a switch-off of the quantum Hall edge transport for different edge terminations except for the armchair one, where two terms cancel out exactly. More interestingly, we show that near the Dirac point changing the laser polarization (circular right or circular left) controls the Hall conductance, by allowing to switch it on or off, or even by flipping its sign, thereby reversing the chirality of the edge states. This might lead to new avenues to fully control topologically protected transport.Fil: Huam谩n, A.. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); ArgentinaFil: Foa Torres, L. E. F.. Universidad de Chile; ChileFil: Balseiro, Carlos Antonio. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; ArgentinaFil: Usaj, Gonzalo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentin

    Emergent parametric resonances and time-crystal phases in driven Bardeen-Cooper-Schrieffer systems

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    We study the out-of-equilibrium dynamics of a Bardeen-Cooper-Schrieffer condensate subject to a periodic drive. We demonstrate that the combined effect of drive and interactions results in emerging parametric resonances, analogous to a vertically driving pendulum. In particular, Arnold tongues appear when the driving frequency matches 2螖0/n, with n being a natural number and 螖0 being the equilibrium gap parameter. Inside the Arnold tongues we find a commensurate time-crystal condensate which retains the U(1) symmetry breaking of the parent superfluid/superconducting phase and shows an additional time-translational symmetry breaking. Outside these tongues, the synchronized collective Higgs mode found in quench protocols is stabilized without the need of a strong perturbation. Our results are directly relevant to cold-atom and condensed-matter systems and do not require very long energy relaxation times to be observed.Fil: Ojeda Collado, Hector Pablo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Universit脿 degli Studi di Roma "La Sapienza"; Italia. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro; ArgentinaFil: Usaj, Gonzalo. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro; ArgentinaFil: Balseiro, Carlos Antonio. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Bariloche.; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); ArgentinaFil: Zanette, Damian Horacio. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Investigaci贸n y Aplicaciones No Nucleares. Gerencia de F铆sica (Centro At贸mico Bariloche); Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia del 脕rea de Energ铆a Nuclear. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Hist贸rico del Centro At贸mico Bariloche e Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Lorenzana, Jos茅. Universit脿 degli Studi di Roma "La Sapienza"; Itali

    Zoonotic "Enterocytozoon bieneusi" genotypes in free-ranging and farmed wild ungulates in Spain

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    Microsporidia comprises a diverse group of obligate, intracellular, and spore-forming parasites that infect a wide range of animals. Among them, Enterocytozoon bieneusi is the most frequently reported species in humans and other mammals and birds. Data on the epidemiology of E. bieneusi in wildlife are limited. Hence, E. bieneusi was investigated in eight wild ungulate species present in Spain (genera Ammotragus, Capra, Capreolus, Cervus, Dama, Ovis, Rupicapra, and Sus) by molecular methods. Faecal samples were collected from free-ranging (n = 1058) and farmed (n = 324) wild ungulates from five Spanish bioregions. The parasite was detected only in red deer (10.4%, 68/653) and wild boar (0.8%, 3/359). Enterocytozoon bieneusi infections were more common in farmed (19.4%, 63/324) than in wild (1.5%, 5/329) red deer. A total of 11 genotypes were identified in red deer, eight known (BEB6, BEB17, EbCar2, HLJD-V, MWC_d1, S5, Type IV, and Wildboar3) and three novel (DeerSpEb1, DeerSpEb2, and DeerSpEb3) genotypes. Mixed genotype infections were detected in 15.9% of farmed red deer. Two genotypes were identified in wild boar, a known (Wildboar3) and a novel (WildboarSpEb1) genotypes. All genotypes identified belonged to E. bieneusi zoonotic Groups 1 and 2. This study provides the most comprehensive epidemiological study of E. bieneusi in Spanish ungulates to date, representing the first evidence of the parasite in wild red deer populations worldwide. Spanish wild boars and red deer are reservoir of zoonotic genotypes of E. bieneusi and might play an underestimated role in the transmission of this microsporidian species to humans and other animal
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