Chinese Physics B最新文献_第4页

Topological phases and edge modes of an uneven ladder 不均匀阶梯的拓扑相位和边缘模式

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad50c0

Wen-Chuang Shang, Yi-Ning Han, Shimpei Endo, Chao Gao

{"title":"Topological phases and edge modes of an uneven ladder","authors":"Wen-Chuang Shang, Yi-Ning Han, Shimpei Endo, Chao Gao","doi":"10.1088/1674-1056/ad50c0","DOIUrl":"https://doi.org/10.1088/1674-1056/ad50c0","url":null,"abstract":"We investigate the topological properties of a two-chain quantum ladder with uneven legs, i.e., the two chains differ in their periods by a factor of 2. Such an uneven ladder presents rich band structures classified by the closure of either direct or indirect bandgaps. It also provides opportunities to explore fundamental concepts concerning band topology and edge modes, including the difference of intracellular and intercellular Zak phases, and the role of the inversion symmetry (IS). We calculate the Zak phases of the two kinds and find excellent agreement with the dipole moment and extra charge accumulation. We also find that configurations with IS feature a pair of degenerate two-side edge modes emerging as the closure of the direct bandgap, while configurations without IS feature one-side edge modes emerging as not only the closure of both direct and indirect bandgaps but also within the band continuum. Furthermore, by projecting to the two sublattices, we find that the effective Bloch Hamiltonian corresponds to that of a generalized Su–Schrieffer–Heeger model or the Rice–Mele model whose hopping amplitudes depend on the quasimomentum. In this way, the topological phases can be efficiently extracted through winding numbers. We propose that uneven ladders can be realized by spin-dependent optical lattices and their rich topological characteristics can be examined by near future experiments.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"80 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Machine-learning-assisted efficient reconstruction of the quantum states generated from the Sagnac polarization-entangled photon source 机器学习辅助高效重建萨格纳克偏振纠缠光子源产生的量子态

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad51f7

Menghui Mao, Wei Zhou, Xinhui Li, Ran Yang, Yan-Xiao Gong, Shi-Ning Zhu

引用次数: 0

Negligible normal fluid in superconducting state of heavily overdoped Bi2Sr2CaCu2O8+δ detected by ultra-low temperature angle-resolved photoemission spectroscopy 超低温角分辨光发射光谱探测到重度过掺杂 Bi2Sr2CaCu2O8+δ 超导态中的微量正流体

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad51f8

Chaohui Yin, Qinghong Wang, Yuyang Xie, Yiwen Chen, Junhao Liu, Jiangang Yang, Junjie Jia, Xing Zhang, Wenkai Lv, Hongtao Yan, Hongtao Rong, Shenjin Zhang, Zhimin Wang, Nan Zong, Lijuan Liu, Rukang Li, Xiaoyang Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Zuyan Xu, Guodong Liu, Hanqing Mao, Lin Zhao, Xintong Li, Xingjiang Zhou

{"title":"Negligible normal fluid in superconducting state of heavily overdoped Bi2Sr2CaCu2O8+δ detected by ultra-low temperature angle-resolved photoemission spectroscopy","authors":"Chaohui Yin, Qinghong Wang, Yuyang Xie, Yiwen Chen, Junhao Liu, Jiangang Yang, Junjie Jia, Xing Zhang, Wenkai Lv, Hongtao Yan, Hongtao Rong, Shenjin Zhang, Zhimin Wang, Nan Zong, Lijuan Liu, Rukang Li, Xiaoyang Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Zuyan Xu, Guodong Liu, Hanqing Mao, Lin Zhao, Xintong Li, Xingjiang Zhou","doi":"10.1088/1674-1056/ad51f8","DOIUrl":"https://doi.org/10.1088/1674-1056/ad51f8","url":null,"abstract":"In high temperature cuprate superconductors, it was found that the superfluid density decreases with the increase of hole doping. One natural question is whether there exists normal fluid in the superconducting state in the overdoped region. In this paper, we have carried out high-resolution ultra-low temperature laser-based angle-resolved photoemission measurements on a heavily overdoped Bi2212 sample with a <italic toggle=\"yes\">T</italic>c of 48 K. We find that this heavily overdoped Bi2212 remains in the strong coupling regime with 2<italic toggle=\"yes\">Δ</italic>0/(<italic toggle=\"yes\">k</italic>B <italic toggle=\"yes\">T</italic>c) = 5.8. The single-particle scattering rate is very small along the nodal direction (∼5 meV) and increases as the momentum moves from the nodal to the antinodal regions. A hard superconducting gap opening is observed near the antinodal region with the spectral weight at the Fermi level fully suppressed to zero. The normal fluid is found to be negligibly small in the superconducting state of this heavily overdoped Bi2212. These results provide key information to understand the high <italic toggle=\"yes\">T</italic>c mechanism in the cuprate superconductors.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"208 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141867208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Cryogenic transmission electron microscopy on beam-sensitive materials and quantum science 低温透射电子显微镜观察光束敏感材料和量子科学

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad5af0

Gang Wang, Jun-Hao Lin

{"title":"Cryogenic transmission electron microscopy on beam-sensitive materials and quantum science","authors":"Gang Wang, Jun-Hao Lin","doi":"10.1088/1674-1056/ad5af0","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5af0","url":null,"abstract":"Transmission electron microscopy (TEM) offers unparalleled atomic-resolution imaging of complex materials and heterogeneous structures. However, high-energy imaging electrons can induce structural damage, posing a challenge for electron-beam-sensitive materials. Cryogenic TEM (Cryo-TEM) has revolutionized structural biology, enabling the visualization of biomolecules in their near-native states at unprecedented detail. The low electron dose imaging and stable cryogenic environment in Cryo-TEM are now being harnessed for the investigation of electron-beam-sensitive materials and low-temperature quantum phenomena. Here, we present a systematic review of the interaction mechanisms between imaging electrons and atomic structures, illustrating the electron beam-induced damage and the mitigating role of Cryo-TEM. This review then explores the advancements in low-dose Cryo-TEM imaging for elucidating the structures of organic-based materials. Furthermore, we showcase the application of Cryo-TEM in the study of strongly correlated quantum materials, including the detection of charge order and novel topological spin textures. Finally, we discuss the future prospects of Cryo-TEM, emphasizing its transformative potential in unraveling the complexities of materials and phenomena across diverse scientific disciplines.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"779 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A family of quantum von Neumann architecture 量子冯-诺依曼体系结构系列

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad50be

Dong-Sheng Wang

引用次数: 0

Tunable energy spectrum betatron x-ray sources in a plasma wakefield 等离子体汪场中的可调谐能谱贝塔射线源

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad4531

Chuan-Yi Xi, Yin-Ren Shou, Li-Qi Han, Abdughupur Ablimit, Xiao-Dan Liu, Yan-Ying Zhao, Jin-Qing Yu

引用次数: 0

High-visibility ghost imaging with phase-controlled discrete classical light sources 利用相位控制离散经典光源进行高可见度鬼影成像

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad4631

Xueying Wu, Yue Zhao, Liming Li

引用次数: 0

Large-scale particle trapping by acoustic vortices with a continuously variable topological charge 带有连续可变拓扑电荷的声学漩涡对大规模粒子的捕获

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad5aef

Haofei Zhuang, Qingyuan Zhang, Gehao Hu, Qingdong Wang, Libin Du

{"title":"Large-scale particle trapping by acoustic vortices with a continuously variable topological charge","authors":"Haofei Zhuang, Qingyuan Zhang, Gehao Hu, Qingdong Wang, Libin Du","doi":"10.1088/1674-1056/ad5aef","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5aef","url":null,"abstract":"Strengthened directivity with higher-order side lobes can be generated by the transducer with a larger radius at a higher frequency. The multi-annular pressure distributions are displayed in the cross-section of the acoustic vortices (AVs) which are formed by side lobes. In the near field, particles can be trapped in the valley region between the two annuli of the pressure peak, and cannot be moved to the vortex center. In this paper, a trapping method based on a sector transducer array is proposed, which is characterized by the continuously variable topological charge (CVTC). This acoustic field can not only enlarge the range of particle trapping but also improve the aggregation degree of the trapped particles. In the experiments, polyethylene particles with a diameter of 0.2 mm are trapped into the multi-annular valleys by the AV with a fixed topological charge. Nevertheless, by applying the CVTC, particles outside the radius of the AV can cross the pressure peak successfully and move to the vortex center. Theoretical studies are also verified by the experimental particles trapping using the AV with the continuous variation of three topological charges, and suggest the potential application of large-scale particle trapping in biomedical engineering.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"60 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141571669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Symmetry quantification and segmentation in STEM imaging through Zernike moments 通过 Zernike 矩对 STEM 成像进行对称性量化和分割

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad51f4

Jiadong Dan, Cheng Zhang, Xiaoxu Zhao, N. Duane Loh

引用次数: 0

Quantitative analysis of laser-generated ultrasonic wave characteristics and their correlation with grain size in polycrystalline materials 定量分析激光产生的超声波特性及其与多晶材料晶粒尺寸的相关性

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-07-01 DOI: 10.1088/1674-1056/ad50bd

Zhaowen Xu, Xue Bai, Jian Ma, Zhuangzhuang Wan, Chaoqun Wang

{"title":"Quantitative analysis of laser-generated ultrasonic wave characteristics and their correlation with grain size in polycrystalline materials","authors":"Zhaowen Xu, Xue Bai, Jian Ma, Zhuangzhuang Wan, Chaoqun Wang","doi":"10.1088/1674-1056/ad50bd","DOIUrl":"https://doi.org/10.1088/1674-1056/ad50bd","url":null,"abstract":"Quantitative relationship between nanosecond pulsed laser parameters and the characteristics of laser-generated ultrasonic waves in polycrystalline materials was evaluated. The high energy of the pulsed laser with a large irradiation spot simultaneously generated ultrasonic longitudinal and shear waves at the epicenter under the slight ablation regime. An optimized denoising technique based on wavelet thresholding and variational mode decomposition was applied to reduce noise in shear waves with a low signal-to-noise ratio. An approach for characterizing grain size was proposed using spectral central frequency ratio (SCFR) based on time-frequency analysis. The results demonstrate that the generation regime of ultrasonic waves is not solely determined by the laser power density; even at high power densities, a high energy with a large spot can generate an ultrasonic waveform dominated by the thermoelastic effect. This is ascribed to the intensification of the thermoelastic effect with the proportional increase in laser irradiation spot area for a given laser power density. Furthermore, both longitudinal and shear wave SCFRs are linearly related to grain size in polycrystalline materials; however, the shear wave SCFR is more sensitive to finer-grained materials. This study holds great significance for evaluating metal material properties using laser ultrasound.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"34 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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