Science China Physics, Mechanics & Astronomy最新文献_第6页

General theory for designing phonon transport in alloyed/doped materials 设计合金/掺杂材料中声子传输的一般理论

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-30 DOI: 10.1007/s11433-024-2464-6

Chenhan Liu, Chao Wu, Wei Liu, Yunshan Zhao, Gang Zhang, Hongmin Yang, Yunfei Chen

{"title":"General theory for designing phonon transport in alloyed/doped materials","authors":"Chenhan Liu, Chao Wu, Wei Liu, Yunshan Zhao, Gang Zhang, Hongmin Yang, Yunfei Chen","doi":"10.1007/s11433-024-2464-6","DOIUrl":"10.1007/s11433-024-2464-6","url":null,"abstract":"<div>Alloying/doping is a widely used technique for improving the electrical, mechanical, and optical properties of materials. However, this technology induces significant distortions in the lattice structure, mass distribution, and potential field, greatly enhancing phonon scattering. Here, we introduce the concept of alloying/doping path and employ crystal symmetry, lattice deformation, and electron distribution to characterize it. Based on this new concept, the phonon thermal transport behavior in alloyed/doped materials can be well designed, and along different alloying/doping paths, the difference in thermal conductivity can be up to 45 times. On one hand, strategic alloying/doping that combines high crystal symmetry, large lattice contraction, and the same electron distribution suppresses phonon-phonon scattering phase space, induces phonon stiffening, and bolsters electronic structure symmetry, respectively. These synergistic effects significantly improve thermal conductivity. On the other hand, random alloying/doping has a low symmetry, leading to the typical “U” shape of alloying/doping level-dependent thermal conductivity. Our theory is corroborated in three-dimensional (3D) Si, 2D MoS2, and quasi-1D TiS3, affirming its efficacy and broad applicability in controlling phonon transport.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"67 12","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-29 DOI: 10.1007/s11433-024-2513-3

Xiaolei Hao, Junping Wang, Zhaohan Zhang, Jiarui Qin, Zheng Shu, Chan Li, Jingyu Zhang, Weidong Li, Feng He, Jing Chen

引用次数: 0

Geometric-like imaginarity: Quantification and state conversion 类似几何的想象力量化和状态转换

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-28 DOI: 10.1007/s11433-024-2514-x

Meng-Li Guo, Bo Li, Shao-Ming Fei

引用次数: 0

Surface tension effects on Rayleigh-Taylor instability in nonideal fluids: A multiple-relaxation-time discrete Boltzmann study 非理想流体中瑞利-泰勒不稳定性的表面张力效应：多重松弛时间离散玻尔兹曼研究

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-28 DOI: 10.1007/s11433-024-2490-x

Feng Chen, Aiguo Xu, Jiahui Song, Yanbiao Gan, Yudong Zhang, Ning Guan

{"title":"Surface tension effects on Rayleigh-Taylor instability in nonideal fluids: A multiple-relaxation-time discrete Boltzmann study","authors":"Feng Chen, Aiguo Xu, Jiahui Song, Yanbiao Gan, Yudong Zhang, Ning Guan","doi":"10.1007/s11433-024-2490-x","DOIUrl":"10.1007/s11433-024-2490-x","url":null,"abstract":"<div>A multi-relaxation-time discrete Boltzmann model for compressible non-ideal gases with adjustable specific heat ratio is proposed, and the impact of surface tension on Rayleigh-Taylor instability (RTI) is investigated from two perspectives: macroscopic and non-equilibrium characteristics. In terms of physical cognition, (1) it is found that there are two critical surface tensions: the upper critical value and the lower critical value. When the surface tension is below the lower critical value, the RTI evolution aligns qualitatively with the case without surface tension. As the surface tension coefficient increases, the inhibitory effect on RTI evolution gradually strengthens. When the surface tension is greater than the upper critical value, the disturbance interface tends to be stable after multiple oscillations. When the surface tension is in between, the perturbation interface first reverses, or even multiple reverses, and then destabilizes and develops rapidly. (2) A series of new kinetic behavior characteristics are given, and it is found that some behavior characteristics have important reference value for the control of system behavior. For example, the first peak in the growth rate of the global average non-organized momentum flux strength D2 corresponds to the onset of the regular nonlinear stage. The peak in the growth rate of the global average non-organized energy flux strength D3,1 marks the beginning of the re-acceleration stage. The onset of the uniform acceleration stage in the growth rate of the global average non-equilibrium strength DTNE corresponds to the system transitioning into the regular nonlinear stage, while its terminal point (also the peak) corresponds to the system entering the re-acceleration stage. These insights enhance understanding of RTI mechanisms in complex fluids kinetically.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"67 12","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Constraints on holographic QCD phase transitions from PTA observations 从 PTA 观测看全息 QCD 相变的制约因素

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI: 10.1007/s11433-024-2468-x

Song He, Li Li, Sai Wang, Shao-Jiang Wang

引用次数: 0

Observational evidence for the AGN wind as a regulator of galaxy evolution AGN 风作为星系演化调节器的观测证据

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI: 10.1007/s11433-024-2485-7

Feng Yuan

引用次数: 0

Hinge Majorana flat band in type-II Dirac semimetals II 型狄拉克半金属中的铰链马约拉纳平带

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI: 10.1007/s11433-024-2483-8

Yue Xie, Xianxin Wu, Zhong Fang, Zhijun Wang

引用次数: 0

Disentangling the electron-lattice dichotomy of the excitonic insulating phase in Ta2Ni(Se1−xSx)5 with sulfur substitution and potassium deposition 利用硫置换和钾沉积解开 Ta2Ni(Se1-xSx)5 中激子绝缘相的电子-晶格二分法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI: 10.1007/s11433-024-2480-4

Tongrui Li, Yang Liu, Hongen Zhu, Haiping Chen, Zhanfeng Liu, Zhengming Shang, Yuliang Li, Hui Tian, Yunbo Wu, Yuhao Hong, Haihua Luo, Yi Liu, Guobin Zhang, Lidong Zhang, Yuqiao Guo, Changzheng Wu, Li Song, Shengtao Cui, Zhe Sun

{"title":"Disentangling the electron-lattice dichotomy of the excitonic insulating phase in Ta2Ni(Se1−xSx)5 with sulfur substitution and potassium deposition","authors":"Tongrui Li, Yang Liu, Hongen Zhu, Haiping Chen, Zhanfeng Liu, Zhengming Shang, Yuliang Li, Hui Tian, Yunbo Wu, Yuhao Hong, Haihua Luo, Yi Liu, Guobin Zhang, Lidong Zhang, Yuqiao Guo, Changzheng Wu, Li Song, Shengtao Cui, Zhe Sun","doi":"10.1007/s11433-024-2480-4","DOIUrl":"10.1007/s11433-024-2480-4","url":null,"abstract":"<div>Ta2NiSe5 is a promising candidate for hosting an excitonic insulator (EI) phase, a novel electronic state driven by electron-hole Coulomb attraction. However, the role of electron-lattice coupling in the formation of the EI phase remains controversial. Here, we use angle-resolved photoemission spectroscopy (ARPES) to study the band structure evolution of Ta2Ni(Se1−xSx)5 with sulfur substitution and potassium deposition, which modulate the band gap and the carrier concentration, respectively. We find that the Ta 5d states originating from the bottom of the conduction band persist at the top of the valence band in the low-temperature monoclinic phase, indicating the importance of exciton condensation in opening the gap in the semi-metallic band structure. We also observe that the characteristic overlap between the conduction and valence bands can be restored in the monoclinic lattice by mild carrier injection, suggesting that the lattice distortion in the monoclinic phase is not the main factor for producing the insulating gap, but rather the exciton condensation in the electronic system is the dominant driving force. Our results shed light on the electron-lattice decoupling and the origin of the EI phase in Ta2Ni(Se1−xSx)5.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"67 12","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Practical approach for detecting k-nonseparability of multipartite quantum states 检测多方量子态 k 不可分割性的实用方法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI: 10.1007/s11433-024-2497-7

Jie Guo, Jinchuan Hou, Xiaofei Qi, Kan He

引用次数: 0

The transition from galaxy-wide gas inflow to outflow in quasar host galaxies 类星体宿主星系从全星系气体流入到流出的转变

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-24 DOI: 10.1007/s11433-024-2475-7

Zhicheng He, Zhifu Chen, Guilin Liu, Tinggui Wang, Luis C. Ho, Junxian Wang, Weihao Bian, Zheng Cai, Guobin Mou, Qiusheng Gu, Zhiwen Wang

{"title":"The transition from galaxy-wide gas inflow to outflow in quasar host galaxies","authors":"Zhicheng He, Zhifu Chen, Guilin Liu, Tinggui Wang, Luis C. Ho, Junxian Wang, Weihao Bian, Zheng Cai, Guobin Mou, Qiusheng Gu, Zhiwen Wang","doi":"10.1007/s11433-024-2475-7","DOIUrl":"10.1007/s11433-024-2475-7","url":null,"abstract":"<div>Galactic-scale outflows driven by active galactic nuclei (AGNs) represent a commonly invoked feedback mechanism within galaxy evolution models. However, the interactions among interstellar gas on galactic scales, the propagation of AGN outflows, and the fundamental parameters of AGNs during their evolutionary processes remain poorly understood. Notably, powerful nuclear outflows are typically associated with the early stages of AGN activity, which are characterized by high accretion rates and weak narrow emission lines. In our analysis of a sample of quasars hosting Mg ii narrow absorption lines (NALs) obtained from the Sloan Digital Sky Survey, we identify a previously unobserved phenomenon wherein galaxy-scale inflow transitions to outflow dominance, concurrent with a notable increase in the strength of the narrow [O III] line, achieving a confidence level of 6.7σ. This indicates that while nuclear outflows diminish, galaxy-wide outflows intensify as AGNs evolve. These findings suggest that early-stage outflows interact with the interstellar medium on a galactic scale, thereby facilitating a gradual transition to galaxy-wide outflows. This provides observational support for the hypothetical multi-stage propagation of AGN outflows that globally regulates galaxy evolution.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"67 12","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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