Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>Minimizing the effect of noise is essential for quantum computers. The conventional method to protect qubits against noise is through quantum error correction. However, for current quantum hardware in the so-called noisy intermediate-scale quantum (NISQ) era, noise presents in these systems and is too high for error correction to be beneficial. Quantum error mitigation is a set of alternative methods for minimizing errors, including error extrapolation, probabilistic error cancellation, measurement error mitigation, subspace expansion, symmetry verification, virtual distillation, etc. The requirement for these methods is usually less demanding than error correction. Quantum error mitigation is a promising way of reducing errors on NISQ quantum computers. This paper gives a comprehensive introduction to quantum error mitigation. The state-of-art error mitigation methods are covered and formulated in a general form, which provides a basis for comparing, combining and optimizing different methods in future work.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Magnetics, ferroelectrics and multiferroics have attracted great attentions because they are not only extremely important for investigating fundamental physics, but also have important applications in information technology. Here, recent computational studies on magnetism and ferroelectricity are reviewed. We first give a brief introduction to magnets, ferroelectrics, and multiferroics. Then, theoretical models and corresponding computational methods for investigating these materials are presented. In particular, a new method for computing the linear magnetoelectric coupling tensor without applying an external field in the first principle calculations is proposed for the first time. The functionalities of our home-made Property Analysis and Simulation Package for materials (PASP) and its applications in the field of magnetism and ferroelectricity are discussed. Finally, we summarize this review and give a perspective on possible directions of future computational studies on magnetism and ferroelectricity.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The transport properties of core-shell nanowires (CSNWs) under interface modulation and confinement are investigated based on the atomic-bond-relaxation (ABR) correlation mechanism and Fermi’s golden rule. An analytical expression for the relationship between carrier mobility and interface mismatch strain is derived and the influence of size, shell thickness and alloyed layer on effective mass, band structures and deformation potential constant are studied. It is found that interface modulation can not only reduce the lattice mismatch to optimize the band alignment, but also participate in the carrier transport for enhancing mobility. Moreover, the underlying mechanism regarding the interface shape dependence of transport properties in CSNWs is clarified. The dramatically enhancement of electron mobility suggest the interface modulation may become a potential pathway for improving performance of nanoelectronic devices.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We report a new design of resonant cavity for W-band EPR spectrometer. An improved coupling-adjusting mechanism, which is robust, compact, and suits with both solenoid-type and split-pair magnets, is utilized on the cavity, and thus enables both continuous-wave (CW) and pulsed EPR experiments. It is achieved by a tiny metal cylinder in the iris. The coupling coefficient can be varied from 0.2 to 17.9. Furthermore, two pistons at each end of the cavity allows for adjustment of the resonant frequency. A horizontal TE<jats:sub>011</jats:sub> geometry also makes the cavity compatible with the two frequently-used types of magnets. The coupling-varying ability has been demonstrated by reflection coefficient (S11) measurement. CW and pulsed EPR experiments have been conducted. The performance data indicates a prospect of wide applications of the cavity in the fields of physics, chemistry and biology.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>A three-dimensional Darcy Forchheimer mixed convective flow of a couple stress hybrid nanofluid flow through a vertical plate by means of the double diffusion Cattaneo-Christov model is presented in this study. The influence of high-order velocity slip flow, as well as a passive and active control, are also considered. The motive of the research is to develop a computational model using cobalt ferrite (CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>) and copper (Cu) nanoparticles (NPs) in the carrier fluid water, to magnify the energy and mass communication rate and boost the efficiency and performance of thermal energy conduction for a variety of commercial and biological purposes. The proposed model becomes more significant, with an additional effect of non-Fick’s mass flux and Fourier’s heat model to report the energy and mass passage rate. The results are obtained through the computational strategy parametric continuation method. The Figures are plotted to reveal the physical sketch of the obtained solution, while the statistical; assessment has been evaluated through Tables. It has been observed that the dispersion of Cu and CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> NPs to the base fluid significantly enhances the velocity and thermal conductivity of water, which is the most remarkable property of these NPs from the industrial point of view.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>TGG crystal can be used to fabricate various magneto-optical devices, due to its optimum Faraday Effect. In this work, 400-keV He<jats:sup>+</jats:sup> ions with a fluence of 6.0 × 10<jats:sup>16</jats:sup> ions/cm<jats:sup>2</jats:sup> were irradiated into the TGG crystal for the planar waveguide formation. The precise diamond blade dicing with the rotation speed of 20,000 rpm and the cutting velocity of 0.1 mm/s was performed on the He<jats:sup>+</jats:sup>-implanted TGG planar waveguide for the ridge structure. The dark-mode spectrum of the He<jats:sup>+</jats:sup>-implanted TGG planar waveguide was measured by the prism-coupling method, obtaining the relationship between the reflected light intensity and the effective refractive index. The refractive index profile of the planar waveguide was reconstructed by the reflectivity calculation method. The near-field light intensity distributions of the planar and ridge waveguides were recorded by the end-face coupling method. The He<jats:sup>+</jats:sup>-implanted and diamond blade-diced TGG crystal planar and ridge waveguides are promising candidates for integrated magneto-optical devices.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this work, an interlayer perpendicular standing spin wave mode is observed in the skyrmion-hosting [Pt/Co/Ta]<jats:sub>10</jats:sub> multilayer by time-resolved magneto-optical Kerr effect measurements. The observed interlayer mode depends on the interlayer spinpumping and spin transfer torque among the neighboring Co layers. This mode shows monotone increasing frequency-field dependence which is similar to the ferromagnetic resonance mode, but with higher frequency range. Besides, the damping of the interlayer mode is found to be a relatively low constant value of 0.027 which is independent of the external field. This work expound the potential application of the [heavy-metal/ferromagnetic-metal]<jats:sub> <jats:italic>n</jats:italic> </jats:sub> multilayers for skyrmion-based magnonic devices which can provide multiple magnon modes, relatively low damping, and skyrmion states, simultaneously.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>When charged bodies come up close to each other, field energy is diffused and their states are regulated under bidirectional field coupling. For biological neurons, the diversity in intrinsic electric and magnetic field energy can create synaptic connection for fast energy balance and synaptic current is passed across the synapse channel; as a result, energy is pumped and exchanged to induce synchronous firing modes. In this letter, a capacitor is used to connect two neural circuits and energy propagation is activated along the coupling channel. The intrinsic field energy in the two neural circuits is exchanged and the coupling intensity is controlled adaptively by using Heaviside function. Some field energy is saved in the coupling channel and then is sent back to the coupled neural circuits for reaching energy balance. Therefore the circuits can reach possible energy balance and complete synchronization. Maybe the diffusive energy of the coupled neural inspires the synaptic connections to grow stronger for possible energy balance.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Carbyne, the linear chain of carbon, promises the strongest and toughest material but possesses a Peierls instability (alternating single-bonds and triple-bonds) that reduces its strength and toughness. Herein, we computationally found that the gravimetric strength, strain-to-failure and gravimetric toughness can be improved from 74 GPa·g<jats:sup>-1</jats:sup>·cm<jats:sup>3</jats:sup>, 18% and 9.4 kJ·g<jats:sup>-1</jats:sup> for pristine carbyne to the highest values of 106 GPa·g<jats:sup>-1</jats:sup>·cm<jats:sup>3</jats:sup>, 26% and 19.0 kJ·g<jats:sup>-1</jats:sup> for carbyne upon hole injection of +0.07 e/atom, indicating the charged carbyne with record-breaking mechanical performance. Based on the analysis of the atomic and electronic structures, the underlying mechanism behind the record-breaking mechanical performance was revealed as the suppressed and even eliminated bond alternation of carbyne upon charge injection.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>An ideal type-III nodal point is generated by crossing of a completely flat band and a dispersive band along some certain momentum direction. Up to date, the type-III nodal points found in two-dimensional (2D) materials are mostly accidental and random rather than ideal cases, and no one mentions that what kind of lattice can produce ideal nodal points. Here, we propose that ideal type-nodal points can be obtained in Ⅲ a diamond-like lattice. The flat bands in the lattice originate from destructive interference of wavefunctions, and thus are intrinsic and robust. Moreover, the specific lattice can be realized in some 2D carbon networks, such as T-graphene and its derivatives. All the carbon structures possess type-Ⅲ Dirac points. In two of the structures, made of triangular carbon rings, the type-Ⅲ Dirac points just locate on the Fermi level and the Fermi surface are very clean. Our research not only opens a door to find the ideal type-Ⅲ Dirac points, but also provides 2D materials for exploring its physical properties experimentally.</jats:p>