The 23rd International Conference on Few-Body Problems in Physics (FB23)

Highly excited Rydberg atoms exhibit strong and long-range interactions, opening new possibilities for scalable quantum information processing. Rydberg atom array is highly programmable and capable of achieving high-fidelity quantum operations, making it an excellent candidate for large-scale quantum computers. Moreover, the interactions between Rydberg atoms provide a new avenue for...

Non-Hermitian skin effect (NHSE) is a distinctive phenomenon in systems described by non-Hermitian Hamiltonians, where “bulk” eigenstates are spatially localized at the boundary of systems. In this talk, I will introduce a mechanism for particle separation based on their occupation conditions in the unit cells, which arises from the interplay between different skin accumulating channels and...

Bound states in the continuum (BICs) are localized modes residing in the radiation continuum. They were first predicted for single-particle states, and became a general feature of many wave systems. In many-body quantum physics, it is still unclear what would be a close analog of BICs, and whether interparticle interaction may induce BICs. Here, we predict a novel type of multiparticle states...

Quantum matter interacting with gauge fields, an outstanding paradigm in modern physics, underlies the description of various physical systems. Engineering artificial gauge fields in ultracold atoms offers a highly controllable access to the exotic many-body phenomena in these systems. Here we implement a triangular flux ladder in the momentum space of ultracold 133Cs atoms with tunable...

Moiré physics has flourished since the realization of twisted bilayer graphene at magic angles. Thanks to the high controllability and clean environment, ultracold atoms are ideal platforms for studying moiré physics. In this talk, I will present our recent progress in this direction. Using spin-dependent optical lattices for Rb87, Jing Zhang's group at Shanxi University first realized the...

We theoretically investigate the heteronuclear Efimov universality in three-body systems, specifically 87Rb87Rb40K and 133Cs133Cs6Li, which exhibit repulsive intraspecies interactions. Our study focuses on the three-body recombination (TBR) rates with J=0 symmetry on the positive side of the interspecies scattering length. We utilize the R-matrix propagation method within a hyperspherical...

Complex adaptive learning behavior is intelligent. It is adaptive, learns in feedback loops, and generates hidden patterns as many individuals, elements or particles interact in complex adaptive systems (CASs). CASs highlight adaptation in life and lifeless complex systems cutting across all traditional natural and social sciences disciplines. However, discovering a universal law in CASs and...

An inner electron can generate a strong electromagnetic field at the nucleus, leading to the mixing of nuclear levels—a phenomenon known as nuclear hyperfine mixing (NHM). This effect can significantly alter nuclear properties, particularly the lifetimes of nuclear excited states. For instance, the lifetime of the $^{229}$Th isomer is reduced by five orders of magnitude, from $10^3$ seconds to...

Multiphoton ionization of atoms and molecules, involving one or more intermediate states, has been extensively studied for several decades and remains a topic of significant interest. With advancements in attosecond laser techniques, intrinsic timing information in ionization processes has become accessible. In this work, we revisit the role of spin-orbit effects in resonance-enhanced...

After obtaining eigenvalues and eigenfunctions of a particle in a a one dimensional box in the presence of Dunkl operator, we expand the calculations for a three-body systems and for two different Fermion case and Boson case we discuss some new transition that have not seen before.

The optical nonlinearities of most materials are exceedingly small, which often requires fairly intense light fields with many photons to observe notable nonlinear effects. On the other hand, the possibility to enhance optical nonlinearities to the level of individual photons holds a number of interesting prospects, scientifically as well as technologically. Here, two-dimensional, atomically...

Ultracold atomic and molecular gases are important platforms for studying quantum effects. One advantage of ultracold atomic and molecular gases over other systems is that the interparticle interactions are tunable. This is due to the fact that scattering resonances can be induced between ultracold atoms or molecules using the external field. In the vicinity of resonance, interatomic...

Quantum entanglement and its formation mechanism, a topic of debate for 90 years, continue to plague the theoretical physics community and remain unresolved. Physical experiments have shown that quantum behavior does not adhere to Newton's laws and violates Bell's inequality. Its violation directly reveals the nonlocal nature of quantum mechanics. The results necessitate the definition of a...

We present an introduction to the effects of extragalactic background light on the propagation of very high energy (VHE) gamma rays from GRBs. Generically, highly energetic extragalactic photons would be severely attenuated via interaction with the extragalactic background light since the optical depth values for VHE photons are large. Then, how come the multi-TeV photons have been...

Low energy interactions between neutrinos and nucleons have been investigated in manifestly relativistic baryon chiral perturbation theory. At low energies, where chiral perturbation theory is applicable, the total cross sections for the different reaction channels exhibit a sizable non-resonant contribution, which is not present in event generators of broad use in neutrino oscillation and...

When neutrinos are propagating in ordinary matter, their coherent forward scattering off background particles results in the so-called Mikheyev-Smirnov-Wolfenstein (MSW) matter potential, which plays an important role in neutrino flavor conversions. In this talk, I will present a complete one-loop calculation of the MSW potential in the Standard Model (SM). We carry out the renormalization in...

Atmospheric neutrinos contribute significantly to irreducible backgrounds through their neutral-current (NC) interactions with $^{12}$C nuclei in liquid-scintillator (LS) detectors, impacting measurements of diffuse supernova neutrino background (DSNB), nucleon decay, and reactor neutrinos. This talk extends our preceding paper [Phys. Rev. D. 103. 053001], by conducting a first-time systematic...

This paper aims to introduce the Dunkl Fourier transform and expand it for the two body systems. We arrive at the Dunkl Fourier transform by generalizing a simple definition of the Fourier transform and applying this theory to square wave packets and Gaussian wave packets. In addition, we convert the harmonic oscillator from position space to momentum space by Dunkel Fourier transformation. We...

Neutron multiplicity associated with neutrino-nucleus interactions has become important observable in large neutrino detectors such as Super-Kamiokande, KamLAND, and JUNO. The neutron multiplicity can be measured by detecting gamma rays emitted by neutron capture. It is expected to improve the results of various physics analyses using the measured neutron multiplicity to enhance flavor...