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Momentum distribution and non-local high order correlation functions of 1D strongly interacting Bose gas

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Chinese Physics B 2018年第7期27卷 138-151页

作者： EJKP Nandani xi-wen guan Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Department of Mathematics University of Ruhuna Matara 81000 Sri Lanka Department of Theoretical Physics Research School of Physics and Engineering Australian National University Canberra ACT 0200 Australia

The Lieb-Liniger model is a prototypical integrable model and has been turned into the benchmark physics in theoretical and numerical investigations of low-dimensional quantum systems. In this note, we present various methods for calculating local and nonlocal M-particle correlation functions, momentum distribution, and static structure factor. In particular, using the Bethe ansatz wave function of the strong coupling Lieb-Liniger model, we analytically calculate the two-point correlation function, the large moment tail of the momentum distribution, and the static structure factor of the model in terms of the fractional statistical parameter a = 1 - 2/γ, where γ, is the dimensionless interaction strength. We also discuss the Tan＇s adiabatic relation and other universal relations for the strongly repulsive Lieb-Liniger model in terms of the fractional statistical parameter.

关键词： correlation function momentum distributions structure factor contact

Exact Entanglement Dynamics in Three Interacting Qubits

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Chinese Physics Letters 2018年第11期35卷 11-15页

作者： wen-Bin He xi-wen guan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 University of Chinese Academy of Sciences Beijing 100049 Center for Cold Atom Physics Chinese Academy of Sciences Wuhan 430071 Department of Theoretical Physics Research School of Physics and Engineering Australian National University Canberra ACT 0200 Australia

Motivated by recent experimental studies on coherent dynamics transfer in three interacting atoms or electron spins [Phys. Rev. Lett 114（2015） 113002, Phys. Rev. Lett 120（2018） 243604], here we study entanglement entropy transfer in three interacting qubits. We analytically calculate time evolutions of wave function, density matrix and entanglement of the system. We find that initially entangled two qubits may alternatively transfer their entanglement entropy to other two qubit pairs. Thus dynamical evolution of three interacting qubits may produce a genuine three-partite entangled state through entanglement entropy transfers. In particular, different pairwise interactions of the three qubits endow symmetric and asymmetric evolutions of the entanglement transfer,characterized by the quantum mutual information and concurrence. Finally, we discuss an experimental proposal of three Rydberg atoms for testing the entanglement dynamics transfer of this kind.

关键词： Exact Entanglement Dynamics in Three Interacting Qubits

Quantum dynamics of Gaudin magnets

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Communications in Theoretical Physics 2022年第9期74卷 39-48页

作者： wen-Bin He Stefano Chesi Hai-Qing Lin xi-wen guan Beijing Computational Science Research Center Beijing 100193China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsAPMChinese Academy of SciencesWuhan 430071China The Abdus Salam International Center for Theoretical Physics Strada Costiera 11I-34151 TriesteItaly Department of Physics Beijing Normal UniversityBeijing 100875China NSFC-SPTP Peng Huanwu Center for Fundamental Theory Xi’an 710127China Department of Theoretical Physics Research School of Physics and EngineeringAustralian National UniversityCanberra ACT 0200Australia

Quantum dynamics of many-body systems is a fascinating and significant subject for both theory and *** question of how an isolated many-body system evolves to its steady state after a sudden perturbation or quench still remains *** this paper,using the Bethe ansatz wave function,we study the quantum dynamics of an inhomogeneous Gaudin *** derive explicit analytical expressions for various local dynamic quantities with an arbitrary number of flipped bath spins,such as:the spin distribution function,the spin-spin correlation function,and the Loschmidt *** also numerically study the relaxation behavior of these dynamic properties,gaining considerable insight into coherence and entanglement between the central spin and the *** particular,we find that the spin-spin correlations relax to their steady value via a nearly logarithmic scaling,whereas the Loschmidt echo shows an exponential relaxation to its steady *** results advance the understanding of relaxation dynamics and quantum correlations of long-range interacting models of the Gaudin type.

关键词： Gaudin magnets central spin model Bethe ansatz spin polarization spin-spin correlation Loschmidt echo

Excitation spectra of one-dimensional spin-1/2 Fermi gas with an attraction

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Communications in Theoretical Physics 2022年第12期74卷 154-175页

作者： Jia-Feng Pan Jia-Jia Luo xi-wen guan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China Department of Fundamental and Theoretical Physics Research School of PhysicsAustralian National UniversityCanberra ACT 0200Australia University of Chinese Academy of Sciences Beijing 100049China NSFC-SPTP Peng Huanwu Center for Fundamental Theory Xi'an 710127China

Using an exact Bethe ansatz solution,we rigorously study excitation spectra of the spin-1/2 Fermi gas(called Yang–Gaudin model)with an attractive *** excitations of this model involve particle-hole excitation,hole excitation and adding particles in the Fermi seas of pairs and unpaired *** gapped magnon excitations in the spin sector show a ferromagnetic coupling to the Fermi sea of the single *** numerically and analytically solving the Bethe ansatz equations and the thermodynamic Bethe ansatz equations of this model,we obtain excitation energies for various polarizations in the phase of the Fulde–Ferrell–Larkin–Ovchinnikov-like *** a small momentum(long-wavelength limit)and in the strong interaction regime,we analytically obtained their linear dispersions with curvature corrections,effective masses as well as velocities in particle-hole excitations of pairs and unpaired *** a type of particle-hole excitations display a novel separation of collective motions of bosonic modes within paired and unpaired ***,we also discuss magnon excitations in the spin sector and the application of Bragg spectroscopy for testing such separated charge excitation modes of pairs and single fermions.

关键词： Yang-Gaudin model quantum integrability the Bethe ansatz excitation spectrum

Power-law scalings in weakly-interacting Bose gases at quantum criticality

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Frontiers of physics 2022年第6期17卷 235-241页

作者： Ming-Cheng Liang Zhi-xing Lin Yang-Yang Chen xi-wen guan xibo Zhang International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China Institute of Modern Physics Northwest UniversityXi'an 710127China Department of Theoretical Physics Research School of Physics and EngineeringAustralian National UniversityCanberra ACT 0200Australia Beijing Academy of Quantum Information Sciences Beijing 100193China

Weakly interacting quantum systems in low dimensions have been investigated for a long time,but there still remain a number of open questions and a lack of explicit expressions of physical properties of such *** this work,we find power-law scalings of thermodynamic observables in low-dimensional interacting Bose gases at quantum *** present a physical picture for these systems with the repulsive interaction strength approaching zero;namely,the competition between the kinetic and interaction energy scales gives rise to power-law scalings with respect to the interaction strength in characteristic thermodynamic *** prediction is supported by exact Bethe ansatz solutions in one dimension,demonstrating a simple 1/3-power-law scaling of the critical entropy per *** method also yields results in agreement with a non-perturbative renormalization-group computation in two *** results provide a new perspective for understanding many-body phenomena induced by weak interactions in quantum gases.

关键词： power-law scaling quantum criticality Bose gases weak interaction non-perturbative methods

Erratum:Excitation spectra of one-dimensional spin-1/2 Fermi gas with an attraction(2022 ***.74125802)

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Communications in Theoretical Physics 2023年第4期75卷 144-144页

Two typos should be corrected in equations(45)and(47)in ***,in the middle steps of the second equality in equation(45),5 several minus signs are missing.

关键词： Fermi attraction equality

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun wenwen guan Cailing Chen Chao Wu xiaoling Liu Biao Meng Tao Chen Yu Han Jun Wang Shibo xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Activation energy

Molecular dynamics simulations of helium transport through inorganic mineral nanopores

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Science China Earth Sciences 2025年第1期68卷 237-252页

作者： Dandan SONG Ping guan Chi ZHANG Jiahao REN School of Earth and Space Sciences Peking University

Helium transport through nanoscale inorganic mineral pores and pore throats is essential for its overall migration. To elucidate helium's transport dynamics within nanopores, we employed equilibrium and non-equilibrium molecular dynamics simulations to investigate helium's static self-diffusion and pressure-driven flow in quartz slit-shaped nanopores. We also introduced water and various gases, including hydrogen, methane, ethane, nitrogen, and carbon dioxide, into the nanopores to assess their influence on helium transport. Our findings indicate minimal helium adsorption on quartz pore surfaces. Under conditions where the pore size is less than 5 nm and the pressure under 10 MPa, environmental factors markedly influence helium diffusion. Large pore sizes, high temperatures, and low gas pressures enhance helium desorption and facilitate faster diffusion. We observed a positive correlation between helium flow velocity and factors such as pore size, pressure gradient, and surface smoothness of the pores. Notably, the presence of pore water and carrier gases in quartz nanopores, which diffuse more slowly than helium, tends to reduce helium surface adsorption and slow its diffusion. Among the carrier gases studied, nitrogen showed similar adsorption capacity, diffusivity, and stability to helium, while carbon dioxide displayed the highest adsorption capacity and the slowest diffusion rate, markedly differing from helium. Based on the simulation results, we concluded that water and carrier gases primarily function as transport mediums in helium migration, moving together with helium. Nitrogen, which shares similar properties with helium, effectively assists in this co-migration process. Conversely, carbon dioxide, due to its high adsorption capacity and slow diffusion, tends to be lost during co-migration. As a result, gas reservoirs with high nitrogen levels and low carbon dioxide levels are more likely to have higher helium concentrations. Additionally, the smaller por

关键词： Helium transport Slit nanopores Molecular dynamics simulations Diffusion Flow carriers

Enhancing insights into Global Cancer Statistics 2022: implications for cancer control

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Science China Life Sciences 2025年第1期68卷 294-296页

作者： Jingtong Xu Runtian Wang xiaoxiang guan Department of Oncology the First Affiliated Hospital of Nanjing Medical University Jiangsu Key Lab of Cancer Biomarkers Prevention and TreatmentCollaborative Innovation Center for Personalized Cancer MedicineNanjing Medical University

Globally, there has been a marked escalation in tumor morbidity and mortality,cementing tumors as the predominant cause of death in numerous *** the current tumor burden across various regions is imperative to discern potential risk factors and formulate efficacious strategies for tumor ***, the International Agency for Research on Cancer(IARC) provided a status report on the global tumor burden,estimating the incidence and mortality of 36 cancers in 185 countries(Bray et al.,2024).

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