974 research outputs found
Relativistic effect of spin and pseudospin symmetries
Dirac Hamiltonian is scaled in the atomic units , which allows us
to take the non-relativistic limit by setting the Compton wavelength . The evolutions of the spin and pseudospin symmetries towards
the non-relativistic limit are investigated by solving the Dirac equation with
the parameter . With transformation from the original
Compton wavelength to 0, the spin splittings decrease monotonously in all spin
doublets, and the pseudospin splittings increase in several pseudospin
doublets, no change, or even reduce in several other pseudospin doublets. The
various energy splitting behaviors of both the spin and pseudospin doublets
with are well explained by the perturbation calculations of Dirac
Hamiltonian in the present units. It indicates that the origin of spin symmetry
is entirely due to the relativistic effect, while the origin of pseudospin
symmetry cannot be uniquely attributed to the relativistic effect.Comment: 15 pages, 7 figures, accepted by PR
AlGaInP light-emitting diodes with SACNTs as current-spreading layer
Transparent conductive current-spreading layer is important for quantum efficiency and thermal performance of light-emitting diodes (LEDs). The increasing demand for tin-doped indium oxide (ITO) caused the price to greatly increase. Super-aligned carbon nanotubes (SACNTs) and Au-coated SACNTs as current-spreading layer were applied on AlGaInP LEDs. The LEDs with Au-coated SACNTs showed good current spreading effect. The voltage bias at 20 mA dropped about 0.15 V, and the optical power increased about 10% compared with the LEDs without SACNTs
Towards Optimizing with Large Language Models
In this work, we conduct an assessment of the optimization capabilities of
LLMs across various tasks and data sizes. Each of these tasks corresponds to
unique optimization domains, and LLMs are required to execute these tasks with
interactive prompting. That is, in each optimization step, the LLM generates
new solutions from the past generated solutions with their values, and then the
new solutions are evaluated and considered in the next optimization step.
Additionally, we introduce three distinct metrics for a comprehensive
assessment of task performance from various perspectives. These metrics offer
the advantage of being applicable for evaluating LLM performance across a broad
spectrum of optimization tasks and are less sensitive to variations in test
samples. By applying these metrics, we observe that LLMs exhibit strong
optimization capabilities when dealing with small-sized samples. However, their
performance is significantly influenced by factors like data size and values,
underscoring the importance of further research in the domain of optimization
tasks for LLMs
The FEM-Prediction on tensile performance of woven membrane materials under uni and Bi-axial loads
In this study, the mechanical model of the woven PVC-coated membrane materials has been built.
By the FEM analysis, it was found out that when tensioned under uni-axial loads, the tensile modulus in the
warp and fill direction of woven membrane materials could be predicted nicely, especially after the revision
of the properties for the fiber materials. The effect of the tensile moduli of the fiber and the PVC coating
materials on the modulus of the woven membrane fabrics has been discussed. It could be consulted that with
the proper improvement of the modulus of the fiber materials in the fill direction, the discrepancy between
the modulus of woven membrane materials in the warp and fill direction could be reduced to a certain extent.
When it comes to the prediction of the modulus of the woven membrane materials under bi-axial loads, large
difference could be noticed between the predicted results and the experimental results, especially in warp
direction. This was due to the fact that the mechanical analysis model could only show the differences of the
geometry configuration between the warp and fill directions. However, the reinforcement of membrane
materials in warp direction during weaving and coating processes has been ignored
Optimized geometric quantum computation with a mesoscopic ensemble of Rydberg atoms
We propose a nonadiabatic non-Abelian geometric quantum operation scheme to realize universal quantum computation with mesoscopic Rydberg atoms. A single control atom entangles a mesoscopic ensemble of target atoms through long-range interactions between Rydberg states. We demonstrate theoretically that both the single qubit and two-qubit quantum gates can achieve high fidelities around or above 99.9% in ideal situations. Besides, to address the experimental issue of Rabi frequency fluctuation (Rabi error) in Rydberg atom and ensemble, we apply the dynamical-invariant-based zero systematic-error sensitivity (ZSS) optimal control theory to the proposed scheme. Our numerical simulations show that the average fidelity could be 99.98% for single ensemble qubit gate and 99.94% for two-qubit gate even when the Rabi frequency of the gate laser acquires 10% fluctuations. We also find that the optimized scheme can also reduce errors caused by higher-order perturbation terms in deriving the Hamiltonian of the ensemble atoms. To address the experimental issue of decoherence error between the ground state and Rydberg levels in Rydberg ensemble, we introduce a dispersive coupling regime between Rydberg and ground levels, based on which the Rydberg state is adiabatically discarded. The numerical simulation demonstrate that the quantum gate is enhanced. By combining strong Rydberg atom interactions, nonadiabatic geometric quantum computation, dynamical invariant and optimal control theory together, our scheme shows a new route to construct fast and robust quantum gates with mesoscopic atomic ensembles. Our study contributes to the ongoing effort in developing quantum information processing with Rydberg atoms trapped in optical lattices or tweezer arrays
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