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The Compressibility at Unitarity: A Superfluid Signature in Trapped Ultracold Fermi Gases 统一性处的可压缩性：捕获超冷费米气体中的超流体特征
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-29 DOI: 10.1007/s10909-025-03318-y
D. K. Watson
{"title":"The Compressibility at Unitarity: A Superfluid Signature in Trapped Ultracold Fermi Gases","authors":"D. K. Watson","doi":"10.1007/s10909-025-03318-y","DOIUrl":"10.1007/s10909-025-03318-y","url":null,"abstract":"<div><p>The behavior of the thermodynamic compressibility of a trapped ultracold Fermi gas at unitarity is explored as the temperature approaches the critical temperature and the gas undergoes a phase transition to a superfluid state. This phase transition offers an opportunity to probe the microscopic underpinnings of this transition and can serve as a test of theoretical approaches. In this study, the collective behavior of the gas as it undergoes this phase transition is described using normal modes. The Pauli principle is applied “on paper” using specific normal mode assignments that are consistent with this fundamental principle. This study finds a small signature of the transition at the critical temperature in contrast to previous experimental and theoretical results.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"108 - 128"},"PeriodicalIF":1.4,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
First-Principles Study on the Structure and Electronic Structure of K and P-Doped Iron-Based Superconductor BaFe2As2 K和p掺杂铁基超导体BaFe2As2结构和电子结构的第一性原理研究
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-25 DOI: 10.1007/s10909-025-03322-2
Li Li, Zhihua Zhang, Ming He, Long Lin, Yan Cui, Hualong Tao, Weifang Wang, Hongli Wang, Dongfang Jia, Ying Gao, Juan Li, Sheng Zhan, Peihan Yu, Yufen Feng, Huijie Ren, Shuyue Qin, Rubing Zhang, Yuxuan Song, Jingyi Shi
{"title":"First-Principles Study on the Structure and Electronic Structure of K and P-Doped Iron-Based Superconductor BaFe2As2","authors":"Li Li,&nbsp;Zhihua Zhang,&nbsp;Ming He,&nbsp;Long Lin,&nbsp;Yan Cui,&nbsp;Hualong Tao,&nbsp;Weifang Wang,&nbsp;Hongli Wang,&nbsp;Dongfang Jia,&nbsp;Ying Gao,&nbsp;Juan Li,&nbsp;Sheng Zhan,&nbsp;Peihan Yu,&nbsp;Yufen Feng,&nbsp;Huijie Ren,&nbsp;Shuyue Qin,&nbsp;Rubing Zhang,&nbsp;Yuxuan Song,&nbsp;Jingyi Shi","doi":"10.1007/s10909-025-03322-2","DOIUrl":"10.1007/s10909-025-03322-2","url":null,"abstract":"<div><p>In the process of 25% K and 12.5% P-doped BaFe<sub>2</sub>As<sub>2</sub>, the decrease of Fe ions height is accompanied by the suppression of antiferromagnetic order. Both K and P-doping cause an increase in the distance between Fe–As layers and a contraction of Fe–As bonds, and the contraction of Fe–As bond seems to be one of the most sensitive factors affecting antiferromagnetic suppression. It is found that the contraction of Fe–As bonds tends to be coordinated with an increase in Fe–Fe average distance to ultimately suppress antiferromagnetism to a smaller value. Similar structural changes result in K/P-doping causing Lifshitz transition (LT) and electronic topological transition (ETT). At the Fermi level, K-doping increases the density of states of Fe 3<i>d</i> and As 4<i>p</i>, while P-doping reduces these values.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"172 - 183"},"PeriodicalIF":1.4,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Rotating Effects on Thermomagnetic Properties of a Two-Dimensional GaAs Quantum Ring 旋转对二维GaAs量子环热磁特性的影响
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-21 DOI: 10.1007/s10909-025-03314-2
Ahmad Ghanbari
{"title":"Rotating Effects on Thermomagnetic Properties of a Two-Dimensional GaAs Quantum Ring","authors":"Ahmad Ghanbari","doi":"10.1007/s10909-025-03314-2","DOIUrl":"10.1007/s10909-025-03314-2","url":null,"abstract":"<div><p>This study presents a computational investigation of the rotating effects on the thermomagnetic properties of a charged particle confined to a two-dimensional quantum ring with the Aharonov–Bohm flux and external magnetic field. To this end, we have considered the Schrödinger equation (SE) including the gauge field for the rotating process and the potential model of the electromagnetic field. By solving the SE, we have calculated the eigenvalues and eigenfunctions of the system. Using obtained eigenvalues, we have evaluated the partition function of the considered system and have deduced thermodynamic properties such as mean energy, specific heat in constant volume, entropy and free energy. Also, we have calculated magnetic properties of the system such as the magnetization and magnetic susceptibility of the charged particle. Our findings represents that the rotation has a significant effect on thermodynamic and magnetic properties of a 2D quantum ring.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"51 - 65"},"PeriodicalIF":1.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Tunable Photon Blockade Within the Coupled Tripartite Hybrid System 耦合三方混合系统中的可调谐光子阻滞
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-19 DOI: 10.1007/s10909-025-03321-3
Shurui Yan, Junbin Liu, Yueming Wang, Tingxian Zhang
{"title":"Tunable Photon Blockade Within the Coupled Tripartite Hybrid System","authors":"Shurui Yan,&nbsp;Junbin Liu,&nbsp;Yueming Wang,&nbsp;Tingxian Zhang","doi":"10.1007/s10909-025-03321-3","DOIUrl":"10.1007/s10909-025-03321-3","url":null,"abstract":"<div><p>In this paper, we studied the photon blockade (PB) effect within a fully coupled tripartite hybrid system, where a two-level atom is integrated into a cavity optomechanical system. By applying the Schrieffer–Wolff transformation, the tripartite problem is effectively converted into a bipartite problem. The resulting effective Hamiltonian features multi-adjustable parameters: the detunings among the atomic transition frequency, the cavity resonance frequency, the driving field frequency, and the driving amplitude. By means of the probability amplitude method and the quantum master equation method, we investigated the PB effects of the system under varying detunings and driving amplitude. Furthermore, the results show that the PB effect can be achieved within a broader detuning range when the driving amplitude increases. It is noteworthy that the two-level atom plays a non-negligible role in the PB effect because it induces a cavity frequency shift, thereby providing an additional adjustable parameter for the system to optimize the PB effect. Our findings hold instructive and practical value for the design and optimization of relevant experiments in the field of quantum optics.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"160 - 171"},"PeriodicalIF":1.4,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Rotating Quantum Droplets in Low Dimensions 低维旋转量子液滴
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-16 DOI: 10.1007/s10909-025-03319-x
K. Hernández, E. Castellanos
{"title":"Rotating Quantum Droplets in Low Dimensions","authors":"K. Hernández,&nbsp;E. Castellanos","doi":"10.1007/s10909-025-03319-x","DOIUrl":"10.1007/s10909-025-03319-x","url":null,"abstract":"<div><p>Quantum droplets formed by rubidium, lithium, and sodium atoms have been analyzed in this paper by using a logarithmic-type Gross–Pitaevskii equation. Variational methods and numerical techniques were employed to solve the corresponding nonlinear equations. A disk-shaped Bose–Einstein condensate was analyzed to assess its radial evolution. Additionally, free expansion under rotation of the BEC was studied. Compression and expansion around the equilibrium radius were observed in different scenarios, predicting self-confinement, which implies the formation of quantum droplets originating from a BEC state. Briefly, the physical aspects of the system and the possible formation of Bose-nova effects are discussed.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"129 - 148"},"PeriodicalIF":1.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Static Magnetic Properties of Cryogel® and Pyrogel® at Low Temperatures and in High Magnetic Fields 低温和强磁场下Cryogel®和Pyrogel®的静态磁性能
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-11 DOI: 10.1007/s10909-025-03317-z
Caeli L. Benyacko, Garrett T. Hauser, Raven J. Rawson, Alan J. Sherman, Quinton L. Wiebe, Krittin Poottafai, Daniel R. Talham, Mark W. Meisel
{"title":"Static Magnetic Properties of Cryogel® and Pyrogel® at Low Temperatures and in High Magnetic Fields","authors":"Caeli L. Benyacko,&nbsp;Garrett T. Hauser,&nbsp;Raven J. Rawson,&nbsp;Alan J. Sherman,&nbsp;Quinton L. Wiebe,&nbsp;Krittin Poottafai,&nbsp;Daniel R. Talham,&nbsp;Mark W. Meisel","doi":"10.1007/s10909-025-03317-z","DOIUrl":"10.1007/s10909-025-03317-z","url":null,"abstract":"<div><p>The static magnetic properties of the silica-based aerogels of Cryogel® and Pyrogel®, manufactured by Aspen Aerogels®, were measured over a range of temperatures (<span>(2,textrm{K} le T le 400,textrm{K})</span>) and in magnetic fields up to 70 kG. These data and a model of the responses are reported, so these properties are familiar to others who may benefit from knowing them before the materials are employed in potential applications.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"98 - 107"},"PeriodicalIF":1.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Coherence Length and Transport Critical Current Density in Y3Ba5Cu8O18-δ/Co Composite Superconductor Y3Ba5Cu8O18-δ/Co复合超导体的相干长度和输运临界电流密度
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-11 DOI: 10.1007/s10909-025-03320-4
Ipsita Mukherjee, Ajay Kumar Ghosh
{"title":"Coherence Length and Transport Critical Current Density in Y3Ba5Cu8O18-δ/Co Composite Superconductor","authors":"Ipsita Mukherjee,&nbsp;Ajay Kumar Ghosh","doi":"10.1007/s10909-025-03320-4","DOIUrl":"10.1007/s10909-025-03320-4","url":null,"abstract":"<div><p>We have investigated how the low concentrations of ferromagnetic Co-nanoparticles in intergranular networks of multi-layered Y<sub>3</sub>Ba<sub>5</sub>Cu<sub>8</sub>O<sub>18-δ</sub> (Y358) superconductor affect the coherence length (<i>ξ</i><sub>c</sub>) at absolute zero temperature and critical current density, <i>J</i><sub>c</sub>, near the superconducting phase transition region. Fluctuation-induced conductivity (FIC) is used to extract <i>ξ</i><sub>c</sub> (0). An increasing trend of <i>ξ</i><sub>c</sub> (0) with increasing concentration of Co is observed, attributed to the deterioration of the superconducting properties. We have extracted <i>J</i><sub>c</sub> from current–voltage (<i>IV</i>) characteristics in the phase transition region. Reduction in <i>J</i><sub>c</sub> has also been observed with increasing the concentration of Co-nanoparticles.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"149 - 159"},"PeriodicalIF":1.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Top-Loading 4He Sorption Refrigerator 顶装式吸收式冰箱
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-09 DOI: 10.1007/s10909-025-03313-3
Dong-Hun Chae, Bongyeon Won, Jaewan Choi
{"title":"Top-Loading 4He Sorption Refrigerator","authors":"Dong-Hun Chae,&nbsp;Bongyeon Won,&nbsp;Jaewan Choi","doi":"10.1007/s10909-025-03313-3","DOIUrl":"10.1007/s10909-025-03313-3","url":null,"abstract":"<div><p>We describe a newly developed top-loading <sup>4</sup>He sorption refrigerator. The top-loading configuration allows for rapid sample exchange, efficient cooling, and modular probe construction. A prototype comprises a condenser, an evaporator, a charcoal adsorption pump, and a top-loading probe, precooled by a Gifford–McMahon cryocooler. The base temperature and hold time in single-shot mode are 0.95 K and 2.5 h, respectively. The prototype provides a useable cooling power of 1.85 mW at 1 K.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"41 - 50"},"PeriodicalIF":1.4,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03313-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymmetric Rate and Its Impact on Communication Protocol Dynamics in Coupled Double Quantum Dot Systems 非对称速率及其对耦合双量子点系统通信协议动力学的影响
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-07-09 DOI: 10.1007/s10909-025-03315-1
Younes Moqine, Brahim Adnane, Aziz Khribach, Abdelghani El Houri, Ayyoub El Mouatasim, Rachid Houça
{"title":"Asymmetric Rate and Its Impact on Communication Protocol Dynamics in Coupled Double Quantum Dot Systems","authors":"Younes Moqine,&nbsp;Brahim Adnane,&nbsp;Aziz Khribach,&nbsp;Abdelghani El Houri,&nbsp;Ayyoub El Mouatasim,&nbsp;Rachid Houça","doi":"10.1007/s10909-025-03315-1","DOIUrl":"10.1007/s10909-025-03315-1","url":null,"abstract":"<div><p>This study explores quantum information dynamics in asymmetrically coupled double quantum dots, analyzing the effects of symmetry, initial state, and Coulomb interactions on correlation preservation. Results show that symmetry enhances entanglement robustness, while asymmetry and high entanglement increase sensitivity to decoherence. Strong Coulomb interactions support fidelity and capacity retention. These insights are relevant for optimizing protocols such as dense coding and teleportation in decohering environments.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"66 - 82"},"PeriodicalIF":1.4,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Numerical Study on the Contact Characteristics of Multi-stage Superconducting Cables Under Tensile Strain 拉应变作用下多级超导电缆接触特性的数值研究
IF 1.4 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2025-06-30 DOI: 10.1007/s10909-025-03316-0
Sitongyan Li, Zhiwen Zhou, Zhiwen Gao
{"title":"Numerical Study on the Contact Characteristics of Multi-stage Superconducting Cables Under Tensile Strain","authors":"Sitongyan Li,&nbsp;Zhiwen Zhou,&nbsp;Zhiwen Gao","doi":"10.1007/s10909-025-03316-0","DOIUrl":"10.1007/s10909-025-03316-0","url":null,"abstract":"<div><p>Superconducting cables with complex multi-stage helical structures are essential components of the superconducting magnet systems of the International Thermonuclear Experimental Reactor. These cables often experience contact issues that can adversely affect their conductive properties. This study introduces a three-dimensional numerical model designed to accurately analyze the contact characteristics of multi-stage superconducting cables subjected to tensile strain. The model begins by defining the multi-stage geometry of the cable, and then evaluates the distribution of contact pressures and contact regions across individual strands. The numerical model was validated through comparison with existing reference data. An average contact force is introduced to quantify the magnitude of contact force on each strand. The study analyzes the effects of variations in the helical pitches of each stage of the cable on contact characteristics, as well as the influence of changes in the helical pitches of lower-stage cables on the contact characteristics of higher-stage cables. This research enhances the understanding of contact characteristics in multi-stage superconducting cables and provides valuable insights for optimizing the design of advanced hierarchical helical structures.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"83 - 97"},"PeriodicalIF":1.4,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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