Chinese Physics Letters最新文献_第10页

Effective bi-layer model Hamiltonian and density-matrix renormalization group study for the high-Tc superconductivity in La₃Ni₂O₇ under high pressure 高压下La3Ni2O7高tc超导性的有效双层模型哈密顿量和密度矩阵重整化群研究

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-14 DOI: 10.1088/0256-307x/40/12/127401

Yang Shen, Mingpu Qin, Guang-Ming Zhang

{"title":"Effective bi-layer model Hamiltonian and density-matrix renormalization group study for the high-Tc superconductivity in La3Ni2O7 under high pressure","authors":"Yang Shen, Mingpu Qin, Guang-Ming Zhang","doi":"10.1088/0256-307x/40/12/127401","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127401","url":null,"abstract":"Abstract High-Tc superconductivity with possible $T_{c}approx 80K$ has been reported in the single crystal of $text{La}_{3}text{Ni}_{2}text{O}_{7}$ under high pressure. Based on the electronic structure given from the density functional theory calculations, we propose an effective bi-layer model Hamiltonian including both $3d_{z^{2}}$ and $3d_{x^{2}-y^{2}}$ orbital electrons of the nickel cations. The main feature of the model is that the $% 3d_{z^{2}}$ electrons form inter-layer $sigma$-bonding and anti-bonding bands via the apical oxygen anions between the two layers, while the $% 3d_{x^{2}-y^{2}}$ electrons hybridize with the $3d_{z^{2}}$ electrons within each NiO$_2$ plane. The chemical potential difference of these two orbital electrons ensures that the $3d_{z^{2}}$ orbitals are close to half-filling and the $3d_{x^{2}-y^{2}}$ orbitals are near quarter-filling. The strong on-site Hubbard repulsion of the $3d_{z^{2}}$ orbital electrons gives rise to an effective inter-layer antiferromagnetic spin super-exchange $J$. Applying pressure can self-dope holes on the $3d_{z^{2}}$ orbitals with the same amount of electrons doped on the $3d_{x^{2}-y^{2}}$ orbitals. By performing numerical density-matrix renormalization group calculations on a minimum setup and focusing on the limit of large $J$ and small doping of $% 3d_{z^{2}}$ orbitals, we find the superconducting instability on both the $% 3d_{z^{2}}$ and $3d_{x^{2}-y^{2}}$ orbitals by calculating the equal-time spin singlet pair-pair correlation function. Our numerical results have provided useful insights in the high-Tc superconductivity in single crystal La$_3$Ni$_2$O$_7$ under high pressure.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"36 27","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134954085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of the Speed- Acceleration Phase Diagram of Migrating Cells 细胞迁移速度-加速度相图的特点

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-10 DOI: 10.1088/0256-307x/40/12/128701

Yikai Ma, Wei Chen

{"title":"Characteristics of the Speed- Acceleration Phase Diagram of Migrating Cells","authors":"Yikai Ma, Wei Chen","doi":"10.1088/0256-307x/40/12/128701","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/128701","url":null,"abstract":"Abstract The behavior of cell movement is one of the most interesting biological problems in biology, physics and medicine. In this study, we conducted experiments to investigate the characteristics of random cell motion during migration. By observing cell motion trajectories under a microscope, we employed nonlinear dynamics method to construct a speed- acceleration phase diagram. Our analysis revealed the presence of a fixed point in this phase diagram, which suggests that migrating cells possess a stable state. Cells that deviate from this stable state display a tendency to return to it, following the streamline trends of an attractor structure in the phase diagram. We derived a set of characteristic values describing cell motion, encompassing inherent speed, inherent acceleration, characteristic time for speed change, and characteristic time for acceleration change. We developed a differential equation model based on experimental data and conducted numerical calculations. The computational results align with the findings obtained from experimental results. Our research suggests that the asymmetrical characteristics observed in cell motion near an inherent speed primarily arise from the characteristics of inherent acceleration of cells.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"107 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135137983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Signature of superconductivity in pressurized La4Ni3O10 加压 La4Ni3O10 中的超导现象

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-09 DOI: 10.1088/0256-307x/41/1/017401

Qing Li, Ying-Jie Zhang, Zhe-Ning Xiang, Yuhang Zhang, Xiyu Zhu, Hai-Hu Wen

{"title":"Signature of superconductivity in pressurized La4Ni3O10","authors":"Qing Li, Ying-Jie Zhang, Zhe-Ning Xiang, Yuhang Zhang, Xiyu Zhu, Hai-Hu Wen","doi":"10.1088/0256-307x/41/1/017401","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/017401","url":null,"abstract":"The discovery of high-temperature superconductivity near 80 K in bilayer nickelate La3Ni2O7 under high pressures has renewed the exploration of superconducting nickelate in bulk materials. The extension of superconductivity in other nickelates in a broader family is also essential. Here, we report the experimental observation of superconducting signature in trilayer nickelate La4Ni3O10 under high pressures. By using a modified sol-gel method and post-annealing treatment under high oxygen pressure, we successfully obtained polycrystalline La4Ni3O10 samples with different transport behaviors at ambient pressure. Then we performed high-pressure electrical resistance measurements on these samples in a diamond-anvil-cell (DAC) apparatus. Surprisingly, the signature of possible superconducting transition with a maximum transition temperature (T c) of about 20 K under high pressures is observed, as evidenced by a clear drop of resistance and the suppression of resistance drops under magnetic fields. Although the resistance drop is sample-dependent and relatively small, it appears in all of our measured samples. We argue that the observed superconducting signal is most likely to originate from the main phase of La4Ni3O10. Our findings will motivate the exploration of superconductivity in a broader family of nickelates and shed light on the understanding of the underlying mechanisms of high-T c superconductivity in nickelates.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"55 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phase Transition Study meets Machine Learning 相变研究与机器学习

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-09 DOI: 10.1088/0256-307x/40/12/122101

Yu-Gang Ma, Long-Gang Pang, Rui Wang, Kai Zhou

引用次数: 1

A possible quantum spin liquid phase in the Kitaev-Hubbard model 基塔耶夫-哈伯德模型中可能的量子自旋液相

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-09 DOI: 10.1088/0256-307x/40/12/126403

Shaojun Dong, Hao Zhang, Chao Wang, Meng Zhang, Yong-Jian Han, Lixin He

引用次数: 0

Local Rotational Jamming and Multi-Stage Hyperuniformities in an Active Spinner System 主动旋转系统中的局部旋转干扰和多级超均匀性

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-08 DOI: 10.1088/0256-307x/40/12/126402

Rui Liu, Jianxiao Gong, Mingcheng Yang, Ke Chen

{"title":"Local Rotational Jamming and Multi-Stage Hyperuniformities in an Active Spinner System","authors":"Rui Liu, Jianxiao Gong, Mingcheng Yang, Ke Chen","doi":"10.1088/0256-307x/40/12/126402","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/126402","url":null,"abstract":"Abstract An active system consisting of many self-spinning dimers is simulated, and a distinct local rotational jamming transition is observed as the density increases. In the low density regime, the system stays in an absorbing state, in which each dimer rotates independently subject to the applied torque. While in the high density regime, a fraction of the dimers become rotationally jammed into local clusters, and the system exhibits microphase-separation like two-phase morphologies. For high enough densities, the system becomes completely jammed in both rotational and translational degrees of freedom. Such a simple system is found to exhibit rich and multiscale disordered hyperuniformities among the above phases: the absorbing state shows a critical hyperuniformity of the strongest class and subcritically preserves the vanishing density-fluctuation scaling up to some length scale; the locally-jammed state shows a two-phase hyperuniformity conversely beyond some length scale with respect to the phase cluster sizes; the totally jammed state appears to be a monomer crystal, but intrinsically loses large-scale hyperuniformity. These results are inspiring for designing novel phase-separation and disordered hyperuniform systems through dynamical organization.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"54 S267","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135341644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Painlevé integrable (3+1)-dimensional combined pKP–BKP equation: Lump and multiple soliton solutions 新的painlevev可积(3+1)维组合pKP-BKP方程:块解和多孤子解

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-06 DOI: 10.1088/0256-307x/40/12/120501

Abdul-Majid Wazwaz

引用次数: 0

Unconventional nonreciprocal voltage transition in Ag₂Te nanobelts Ag2Te纳米带中非常规非倒易电压跃迁

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-03 DOI: 10.1088/0256-307x/40/12/127201

Peng-Liang Leng, Xiang-Yu Cao, Qiang Ma, Lin-Feng Ai, Yu-Da Zhang, Jing-Lei Zhang, Fa-Xian Xiu

{"title":"Unconventional nonreciprocal voltage transition in Ag2Te nanobelts","authors":"Peng-Liang Leng, Xiang-Yu Cao, Qiang Ma, Lin-Feng Ai, Yu-Da Zhang, Jing-Lei Zhang, Fa-Xian Xiu","doi":"10.1088/0256-307x/40/12/127201","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127201","url":null,"abstract":"Abstract The nonreciprocal effect always emerges in noncentrosymmetric materials for the intrinsic symmetry broken and high conductivity systems for the extrinsic thermoelectric effect. Meanwhile, nonreciprocal charge transport is widely unitized as an effective experimental tool to detect electrical unidirectional intrinsic contribution. Here we show an unconventional nonreciprocal voltage transition in topological insulator Ag 2 Te nanobelts. The nonreciprocal voltage develops from nearly zero to giant values under the applied current I ac and external magnetic fields, while remaining unchanged under various current I dc . This electrical unidirectional contribution is further evidenced by the differential resistance (d V /d I ) measurements. Furthermore, the transition possesses two-dimensional properties under a tilted magnetic field and occurs when the voltage between two electrodes exceeds a certain value. We propose a possible mechanism based on the development of edge channels in Ag 2 Te nanobelts to interpret the phenomenon. Our results not only introduce a peculiar nonreciprocal voltage transition in topological materials but also enrich the understanding of the intrinsic mechanism that strongly affects the nonreciprocal charge transport.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"11 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135868937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Asymmetry enhances thermal transport in porous metamaterials at low temperature 非对称性增强了低温下多孔超材料的热输运

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-03 DOI: 10.1088/0256-307x/40/12/124401

Yu Yang, Dengke Ma, Lifa Zhang

引用次数: 0

Status and prospects of exotic hadrons at Belle II 贝尔二世外来强子的现状与展望

2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-03 DOI: 10.1088/0256-307x/40/12/121301

Sen Jia, Weitao Xiong, Chengping Shen

引用次数: 0