As a cluster overlap amplitude,the reduced-width amplitude is an important physical quantity for analyzing clustering in the nucleus depending on specified channels and has been calculated and widely applied in nuclear cluster physics.In this review,we briefly revisit the theoretical framework for calculating the reduced-width amplitude,as well as the outlines of cluster models to obtain microscopic or semi-microscopic cluster wave functions.We also introduce the recent progress related to cluster overlap amplitudes,including the implementation of cross-section estimation and extension to three-body clustering analysis.Comprehensive examples are provided to demonstrate the application of the reduced-width amplitude in analyzing clustering structures.
The 19th century saw significant advancements in thermodynamics and the kinetic theory of gases,with J.C.Maxwell and L.E.Boltzmann playing key roles in the development of statistical physics through their work on the distribution of single-particle states.At the beginning of the 20th century,J.W.Gibbs established modern equilibrium statistical physics based on the statistical distribution of system microstates and the concept of ensembles.Subsequently,statistical physics expanded into the quantum and nonequilibrium domains.
The high-luminosity Superτ-Charm Factory(STCF)will be a crucial facility for charm-physics research,particularly for the precise measurement of electroweak parameters,measuring D^(0)-D^(-)^(0)mixing parameters,investigating conjugation–parity(CP)violation within the charm sector,searching for the rare and forbidden decays of charmed hadrons,and addressing other foundational questions related to charmed hadrons.With the world’s largest charm-threshold data,the STCF aims to achieve high sensitivity in studying the strong phase of neutral D mesons using quantum correlation,complementing studies at LHCb and Belle II,and contributing to the understanding of CP violations globally.The STCF will also enable world-leading precision in measuring the leptonic decays of charmed mesons and baryons,providing constraints on the Cabibbo–Kobayashi–Maskawa matrix and strong-force dynamics.Additionally,the STCF will explore charmed hadron spectroscopy.The advanced detector and clean experimental environment of the STCF will enable unprecedented precision,help address key challenges in the Standard Model,and facilitate the search for potential new physics.
We study the trimer state in a three-body system,where two of the atoms are subject to Rashba-type spin-orbit coupling and spin-dependent loss while interacting spin-selectively with the third atom.The short-time conditional dynamics of the three-body system is effectively governed by a non-Hermitian Hamiltonian with an imaginary Zeeman field.Remarkably,the interplay of non-Hermitian single particle dispersion and the spin-selective interaction results in a Borromean state and an enlarged trimer phase.The stability of trimer state can be reflected by the imaginary part of trimer energy and the momentum distribution of trimer wave function.We also show the phase diagram of the three-body system under both real and imaginary Zeeman fields.Our results illustrate the interesting consequence of non-Hermitian spectral symmetry on the few-body level,which may be readily observable in current cold-atom experiments.
Application of quantum technologies to fundamental sciences has the potential to advance both fields simultaneously.In the near future,the number of reliable quantum operations in a real-world quantum computer will be constrained by noise and decoherence[1].To overcome these challenges,hybrid quantum-classical algorithms[2]have been proposed.A notable example is the quantum approximate optimization algorithm(QAOA)[3],an algorithm commonly used to address classical combinatorial optimization problems.In high-energy particle collisions,quarks and gluons are produced and immediately form collimated particle sprays,referred to as jets,due to color confinement[4].Accurate jet clustering is crucial to reconstruct the quark or gluon information and enhances the study of the properties of the Higgs boson.For the first time,we apply QAOA to the problem of jet clustering,as shown in Fig.1e,by mapping collision events into graphs,as shown in Fig.1d.We obtain experimental results on quantum computer simulators and quantum computer hardware and find that their performance is comparable to or even better than classical algorithms for a small-sized problem.
Moirésystems have emerged as an ideal platform for exploring interaction effects and correlated states.However,most of the experimental systems are based on either triangular or honeycomb lattices.In this study,based on the self-consistent Hartree–Fock calculation,we investigate the phase diagram of the kagomélattice in a recently discovered system with two degenerateΓvalley orbitals and strong spin–orbit coupling.By focusing on the filling factors of 1/2,1/3 and 2/3,we identify various symmetry-breaking states by adjusting the screening length and dielectric constant.At the half filling,we discover that the spin–orbit coupling induces Dzyaloshinskii–Moriya interaction and stabilizes a classical magnetic state with 120°ordering.Additionally,we observe a transition to a ferromagnetic state with out-of-plane ordering.In the case of 1/3 filling,the system is ferromagnetically ordered due to the lattice frustration.Furthermore,for 2/3 filling,the system exhibits a pinned droplet state and a 120°magnetic ordered state at weak and immediate coupling strengths,respectively.For the strong coupling case,when dealing with non-integer filling,the system is always charge ordered with sublattice polarization.Our study serves as a starting point for exploring the effects of correlation in moirékagomésystems.
