查看更多>>摘要：By the modifying loss function MSE and training area of physics-informed neural networks(PINNs),we propose a neural networks model,namely prior-information PINNs(PIPINNs).We demonstrate the advantages of PIPINNs by simulating Ai-and Bi-soliton solutions of the cylindrical Korteweg-de Vries(cKdV)equation.Numerical experiments show that our proposed model is able not only to simulate these solitons using the cKdV equation,but also to significantly improve its simulation capability.Compared with the original PINNs,the prediction accuracy of our proposed model is improved by one to three orders of magnitude.Moreover,the accuracy of the PIPINNs is further improved by adding the restriction of conservation of energy.
查看更多>>摘要：Deep learning methods have been shown to be effective in representing ground-state wavefunctions of quantum many-body systems,however the existing approaches cannot be easily used for non-square like or large systems.Here,we propose a variational ansatz based on the graph attention network(GAT)which learns distributed latent representations and can be used on non-square lattices.The GAT-based ansatz has a computational complexity that grows linearly with the system size and can be extended to large systems naturally.Numerical results show that our method achieves the state-of-the-art results on spin-1/2 J1-J2 Heisenberg models over the square,honeycomb,triangular,and kagome lattices with different interaction strengths and lattice sizes(up to 24 x 24 for square lattice).The method also provides excellent results for the ground states of transverse field Ising models on square lattices.The GAT-based techniques are efficient and versatile and hold promise for studying large quantum many-body systems with exponentially sized objects.
查看更多>>摘要：We investigate the nature of the strong coupling constant and related physics.Through the analysis of accumulated experimental data around the world,we employ the ability of machine learning to unravel its physical laws.The result of our efforts is a formula that captures the expansive panorama of the distribution of the strong coupling constant across the entire energy range.Importantly,this newly derived expression is very similar to the formula derived from the Dyson-Schwinger equations based on the framework of Yang-Mills theory.By introducing the Euler number e into the functional formula of the strong coupling constant at high energies,we successfully solve the puzzle of the infrared divergence,which allows for a seamless transition of the strong coupling constant from the perturbative to the non-perturbative energy regime.Moreover,the obtained ghost and gluon dressing function distribution results confirm that the obtained strong coupling constant formula can well describe the physical properties of the non-perturbed regime.In addition,we study the quantum-chromodynamics strong coupling constant result of the Bjorken sum ruleΓ1p-nand the quark-quark static energy E0(r),and find that the global energy scale can effectively interpret the experimental data.The present results shed light on the puzzling properties of quantum chromodynamics and the intricate interplay of strong coupling constants at both low and high energy scales.
查看更多>>摘要：Jet quenching parameter (q) is essential for characterizing the interaction strength between jet partons and nuclear matter.Based on the quark-meson model,we develop a new framework for calculating (q) at finite chemical potentials,in which (q) is related to the spectral function of the chiral order parameter.A mean field perturbative calculation up to the one-loop order indicates that the momentum broadening of jets is enhanced at both high temperature and high chemical potential,and approximately proportional to the parton number density in the partonic phase.We further investigate the behavior of (q) in the vicinity of the critical endpoint(CEP)by coupling our calculation with a recently developed equation of state that includes a CEP in the universality class of the Ising model,from which we discover the partonic critical opalescence,i.e.,the divergence of scattering rate of jets and their momentum broadening at the CEP,contributed by scatterings via the σ exchange process.Hence,for the first time,jet quenching is connected with the search of CEP.
查看更多>>摘要：In 2021,the Belle collaboration reported the first observation of a new structure in the φ(2S)γ final state produced in the two-photon fusion process.In the hadronic molecule picture,this new structure can be associated with the shallow isoscalar D*(D)*bound state and as such is an excellent candidate for the spin-2 partner of the X(3872)with the quantum numbers JPC=2++conventionally named X2.In this work we evaluate the electronic width of this new state and argue that its nature is sensitive to its total width,the experimental measurement currently available being unable to distinguish between different options.Our estimates demonstrate that the planned Super τ-Charm Facility offers a promising opportunity to search for and study this new state in the invariant mass distributions for the final states J/Ψγ and φ(2S)γ.
查看更多>>摘要：We demonstrate the flexible tunability of excitation transport in Rydberg atoms,under the interplay of controlled dissipation and interaction-induced synthetic flux.Considering a minimum four-site setup,i.e.,a triangular configuration with an additional output site,we study the transport of a single excitation,injected into a vertex of the triangle,through the structure.While the long-range dipole-dipole interactions between the Rydberg atoms lead to geometry-dependent Peierls phases in the hopping amplitudes of excitations,we further introduce on-site dissipation to a vertex of the triangle.As a result,both the chirality and destination of the transport can be manipulated through the flux and dissipation.In particular,we illustrate a parameter regime where our Rydberg-ring structure may serve as a switch for transporting the injected excitation through to the output site.The underlying mechanism is then analyzed by studying the chiral trajectory of the excitation and the time-dependent dissipation.The switchable excitation transport reported here offers a flexible tool for quantum control in Rydberg atoms,and holds interesting potentials for applications in quantum simulation and quantum information.
查看更多>>摘要：We report a high-average-power acousto-optic(AO)Q-switched intracavity frequency-doubled red laser based on a high-efficiency light-emitting-diode(LED)pumped two-rod Nd,Ce∶YAG laser module.Under quasi-continuous wave operation conditions,a maximum output power of 1319.08 nm wavelength was achieved at 11.26 W at a repetition rate of 100 Hz,corresponding to a maximum optical efficiency of 13.9％and a slope efficiency of 17.9％.In the active Q-switched regime,the pulse energy of the laser was as high as 800 μJ at a repetition rate of 10 kHz with a pulse width of 1.5 μs.Under non-critical phase-matched KTP crystal conditions,an average power of 2.03 W of 658.66 nm through intracavity frequency-doubling was obtained at a repetition frequency of 10 kHz with a duration of 1.3 μs,and the M2 factor was measured to be about 5.8.To the best of our knowledge,this is the highest average power of an LED-pumped AO Q-switched 1319 nm laser and intracavity frequency-doubled red laser reported to date.
查看更多>>摘要：Fiber-reinforced composites possess anisotropic mechanical and heat transfer properties due to their anisotropic fibers and structure distribution.In C/SiC composites,the out-of-plane thermal conductivity has mainly been studied,whereas the in-plane thermal conductivity has received less attention due to their limited thickness.In this study,the slab module of a transient plane source method is adopted to measure the in-plane thermal conductivity of a 2D plain woven C/SiC composite slab,and the test uncertainty is analyzed numerically.The numerical investigation proves that the slab module is reliable for measuring the isotropic and anisotropic slabs with in-plane thermal conductivity greater than 10 W·m-1·K-1.The anisotropic thermal conductivity of the 2D plain woven C/SiC composite slab is obtained within the temperature range of 20-900 ℃ by combining with a laser flash analysis method to measure the out-of-plane thermal conductivity.The results demonstrate that the out-of-plane thermal conductivity of C/SiC composite decreases with temperature,while its in-plane thermal conductivity first increases with temperature and then decreases,and the ratio of in-plane thermal conductivity to out-of-plane thermal conductivity is within 2.2-3.1.
查看更多>>摘要：We propose a feasible strategy of intercepting the layered polymeric nitrogen(LP-N)and hexagonal layered polymeric nitrogen(HLP-N)at ambient conditions by using the confinement templates.The stable mechanism of confined LP-N and HLP-N at ambient conditions is revealed,namely the synergistic effect of charge transfer and vdW confinement effect.The influence rule of interlayer spacing on the stability of LP-N is revealed.Most importantly,the nitrogen content and energy density of recoverable LP-N@graphene(70.59％,8.15kJ/g),LP-N@h-BN(70.59％,7.96 kJ/g),HLP-N@graphene(68.97％,9.31 kJ/g),and HLP-N@h-BN(69.57％,8.05 kJ/g)refresh the new record for the confinement polynitrogen system.
查看更多>>摘要：We construct a new U(1)slave-spin representation for the single-band Hubbard model in the large-U limit.The mean-field theory in this representation is more amenable to describe both the spin-charge-separation physics of the Mott insulator at half-filling and the strange metal behavior at finite doping.By employing a dynamical Green's function theory for slave spins,we calculate the single-particle spectral function of electrons.The result is comparable to that in dynamical mean field theories.We then formulate a dynamical t/U expansion for the doped Hubbard model that reproduces the mean-field results at the lowest order of expansion.To the next order of expansion,it naturally yields an effective low-energy theory of a t-J model for spinons self-consistently coupled to an XXZ model for the slave spins.We show that the superexchange J is renormalized by doping,in agreement with the Gutzwiller approximation.Surprisingly,we find a new ferromagnetic channel of exchange interactions which survives in the infinite U limit,as a manifestation of the Nagaoka ferromagnetism.
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