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Design, Fabrication, and Characterization of Microwave Multiplexing SQUID Prototype 微波多路复用SQUID原型的设计、制造与表征
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-20 DOI: 10.1007/s10909-026-03461-0
Mengjie Song, Yixian Deng, Zhengwei Li, He Gao, Zhouhui Liu, Yudong Gu, XiangXiang Ren, Nan Li, Guofu Liao, Qinglei Xiu, Yu Xu, Mengqi Jiang, Xufang Li, Yaqiong Li, Shibo Shu, Yongjie Zhang, Congzhan Liu
{"title":"Design, Fabrication, and Characterization of Microwave Multiplexing SQUID Prototype","authors":"Mengjie Song,&nbsp;Yixian Deng,&nbsp;Zhengwei Li,&nbsp;He Gao,&nbsp;Zhouhui Liu,&nbsp;Yudong Gu,&nbsp;XiangXiang Ren,&nbsp;Nan Li,&nbsp;Guofu Liao,&nbsp;Qinglei Xiu,&nbsp;Yu Xu,&nbsp;Mengqi Jiang,&nbsp;Xufang Li,&nbsp;Yaqiong Li,&nbsp;Shibo Shu,&nbsp;Yongjie Zhang,&nbsp;Congzhan Liu","doi":"10.1007/s10909-026-03461-0","DOIUrl":"10.1007/s10909-026-03461-0","url":null,"abstract":"<div><p>The readout system with a high multiplexing ratio has become a bottleneck limiting the application of large-scale transition-edge sensor (TES) detector arrays. In recent years, the microwave superconducting quantum interference device (SQUID) multiplexer has emerged as a key technology for effectively reading large-scale cryogenic detector arrays. Currently, the microwave SQUID multiplexer is being adopted by an increasing number of experiments due to its capability of achieving a multiplexing ratio of 2000:1 within the readout bandwidth. In this study, we developed a 32-channel microwave SQUID multiplexer prototype. And we measured eight channels of the prototype. The measured equivalent noise current of the prototype reached 42 pA/<span>(sqrt{Hz})</span>.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783001","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
Cusped Electrical Conductivity in Spin-1 Chiral Fermion Systems Arising from Multifold Band Degeneracy 多重带简并引起的自旋-1手性费米子系统的尖角电导率
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-18 DOI: 10.1007/s10909-026-03448-x
Risako Kikuchi, Junya Endo, Ai Yamakage
{"title":"Cusped Electrical Conductivity in Spin-1 Chiral Fermion Systems Arising from Multifold Band Degeneracy","authors":"Risako Kikuchi,&nbsp;Junya Endo,&nbsp;Ai Yamakage","doi":"10.1007/s10909-026-03448-x","DOIUrl":"10.1007/s10909-026-03448-x","url":null,"abstract":"<div><p>The energy-dependent electrical conductivity in spin-1 chiral fermion systems with disorder is studied using the self-consistent Born approximation. A distinct cusp-like feature appears at an energy different from the band-crossing point, arising from the multifold band-crossing structure formed by the Dirac and trivial bands. By decomposing the conductivity into band-resolved intraband and interband contributions, we clarify the microscopic origin of the cusp structure previously identified in spin-1 chiral fermion systems. These findings demonstrate the critical role of multifold band crossings and disorder-induced broadening of energy levels in determining the transport properties, offering theoretical insight into the unconventional conductivity behavior observed in topological semimetals hosting spin-1 chiral fermions.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782855","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
Correction: Absence of a Phase-Inversion Center as a Necessary Condition for the Josephson Diode Effect and Application to Strongly Spin-Polarized Magnets 修正：缺相中心是约瑟夫森二极管效应的必要条件和在强自旋极化磁体上的应用
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-17 DOI: 10.1007/s10909-026-03446-z
Danilo Nikolić, Niklas L. Schulz, Matthias Eschrig
{"title":"Correction: Absence of a Phase-Inversion Center as a Necessary Condition for the Josephson Diode Effect and Application to Strongly Spin-Polarized Magnets","authors":"Danilo Nikolić,&nbsp;Niklas L. Schulz,&nbsp;Matthias Eschrig","doi":"10.1007/s10909-026-03446-z","DOIUrl":"10.1007/s10909-026-03446-z","url":null,"abstract":"","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782317","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
Solid Argon Films Under Nonequilibrium Conditions 非平衡条件下的固体氩膜
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-14 DOI: 10.1007/s10909-026-03460-1
Paul Leiderer
{"title":"Solid Argon Films Under Nonequilibrium Conditions","authors":"Paul Leiderer","doi":"10.1007/s10909-026-03460-1","DOIUrl":"10.1007/s10909-026-03460-1","url":null,"abstract":"<div><p>Argon belongs to the class of rare and molecular gases that exhibit triple-point wetting, a regime in which adsorbed solid films remain only a few monolayers thick under thermodynamic equilibrium well below the triple point. Here we investigate the behavior of such films under nonequilibrium conditions, with particular emphasis on temperature gradients imposed within the sample cell. We show that these gradients can drive the formation of significantly thicker films than predicted by triple-point wetting theory. Our findings are motivated by, and possibly offer insight into, recent experiments with electron qubits above solid neon films, where film thicknesses substantially exceed equilibrium expectations.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03460-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148719163","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
Effects of Lanthanum Doping on Structural Evolution, Morphological Features, and Flux Pinning in FeSe0.5Te0.5 Single Crystals with Machine Learning Assistance 在机器学习辅助下，镧掺杂对FeSe0.5Te0.5单晶结构演化、形态特征和通量钉钉的影响
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-10 DOI: 10.1007/s10909-026-03455-y
Jie Zhang, Jian Peng, Jens Hänisch, Shengnan Zhang, Shunpeng Shi, Chuanyu Zhang, Fanggong Cai, Guo Yan, Yong Zhao
{"title":"Effects of Lanthanum Doping on Structural Evolution, Morphological Features, and Flux Pinning in FeSe0.5Te0.5 Single Crystals with Machine Learning Assistance","authors":"Jie Zhang,&nbsp;Jian Peng,&nbsp;Jens Hänisch,&nbsp;Shengnan Zhang,&nbsp;Shunpeng Shi,&nbsp;Chuanyu Zhang,&nbsp;Fanggong Cai,&nbsp;Guo Yan,&nbsp;Yong Zhao","doi":"10.1007/s10909-026-03455-y","DOIUrl":"10.1007/s10909-026-03455-y","url":null,"abstract":"<div><p>Single crystals of La<sub><i>x</i></sub>Fe<sub>1−<i>x</i></sub>Se<sub>0.5</sub>Te<sub>0.5</sub> (<i>x</i> = 0, 0.02, 0.04, 0.06, 0.08) were grown using the self-flux method. A systematic investigation of the effects of La addition revealed changes in the lattice parameters, with the lattice parameter a decreasing and the lattice parameter <i>c</i> showing a slight increasing tendency. The superconducting transition temperature showed no significant dependence on La doping. However, when <i>x</i> reached 0.04, the critical current density derived from magnetization loops using the Bean model increased. The dominant pinning mechanism induced by La in FeSe<sub>0.5</sub>Te<sub>0.5</sub> was identified as normal point pinning at low magnetic fields. At the same time, machine learning was employed to quantitatively model the composition–property relationship between La doping and superconducting and magnetic properties; the results indicate that this method is effective in capturing experimental trends. This work demonstrates that rare earth doping could be a viable strategy for optimizing flux pinning in iron-based superconductors.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03455-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751274","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
Design and Room-Temperature ESR Characterization of a Compact Planar Loop-Gap Resonator near 12 GHz for Prospective Cryogenic Applications 面向低温应用的12 GHz紧凑平面环隙谐振器的设计和室温ESR表征
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-08 DOI: 10.1007/s10909-026-03457-w
Yuya Ishikawa, Yutaka Kurachi, Jarno Järvinen, Sergey Vasiliev, Yutaka Fujii
{"title":"Design and Room-Temperature ESR Characterization of a Compact Planar Loop-Gap Resonator near 12 GHz for Prospective Cryogenic Applications","authors":"Yuya Ishikawa,&nbsp;Yutaka Kurachi,&nbsp;Jarno Järvinen,&nbsp;Sergey Vasiliev,&nbsp;Yutaka Fujii","doi":"10.1007/s10909-026-03457-w","DOIUrl":"10.1007/s10909-026-03457-w","url":null,"abstract":"<div><p>We report the design, fabrication, microwave characterization, and room-temperature ESR demonstration of a compact planar loop-gap resonator operating near 12 GHz. The resonator was fabricated by etching a 20-µm-thick copper layer on a glass-composite substrate and consisted of a 4.2-mm-diameter circular conductor with a 0.15-mm gap. Non-contact coupling to a stripline was characterized by varying the relative lateral and vertical positions of the resonator. At the position giving the largest resonance dip, the resonance frequency and loaded <i>Q</i>-factor were 12.2 GHz and 67.8, respectively, corresponding to a bandwidth of approximately 180 MHz. A first-order lumped RLC description was used to interpret the measured resonance characteristics. Room-temperature continuous-wave ESR measurements of DPPH demonstrated spin detection near 12.7 GHz with a signal-to-noise ratio of approximately 20. The present results demonstrate a simple planar fabrication and coupling approach for compact ESR resonators.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03457-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751154","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
Distinguishing Features of Longitudinal Magnetoconductivity for a Rarita–Schwinger–Weyl Node rariita - schwinger - weyl节点纵向导电性的区别特征
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-07 DOI: 10.1007/s10909-026-03452-1
Ipsita Mandal
{"title":"Distinguishing Features of Longitudinal Magnetoconductivity for a Rarita–Schwinger–Weyl Node","authors":"Ipsita Mandal","doi":"10.1007/s10909-026-03452-1","DOIUrl":"10.1007/s10909-026-03452-1","url":null,"abstract":"<div><p>The band-degeneracy points in the Brillouin zones of chiral crystals exist in multiple avatars, with the high-symmetry points being able to host multifold nodes of distinct characters. A class of such crystals, assisted by the spin-orbit coupling, harbours fourfold degeneracy in the form of Rarita–Schwinger–Weyl node (RSWN) at the <span>(Gamma )</span>-point. Our aim is to explore the nature of longitudinal magnetoconductivity, arising from applying collinear electric and magnetic fields, for such systems. Adjusting the chemical potential to lie near the intrinsic energy-location of the RSWN, the multifold nature of the RSWN is revealed by an interplay of intraband and interband scatterings, which would not arise in twofold degeneracies like the conventional Weyl nodes. The current study fills up the much-needed gap in obtaining the linear response from an exact computation, rather than the insufficient relaxation-time approximation employed earlier.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751419","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
Zero-Point Energy of a Trapped Ultracold Fermi Gas at Unitarity: Squeezing the Heisenberg Uncertainty Principle and Suppressing the Pauli Principle to Produce a Superfluid State 在统一处捕获的超冷费米气体的零点能量：压缩海森堡测不准原理和抑制泡利原理以产生超流体状态
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-06 DOI: 10.1007/s10909-026-03456-x
D. K. Watson
{"title":"Zero-Point Energy of a Trapped Ultracold Fermi Gas at Unitarity: Squeezing the Heisenberg Uncertainty Principle and Suppressing the Pauli Principle to Produce a Superfluid State","authors":"D. K. Watson","doi":"10.1007/s10909-026-03456-x","DOIUrl":"10.1007/s10909-026-03456-x","url":null,"abstract":"<div><p>The zero-point energy of a trapped ultracold Fermi gas at unitarity is investigated in relation to the combined effects of the Heisenberg uncertainty principle and the Pauli principle. This lowest allowed quantum state is a superfluid state which has been studied extensively both experimentally and theoretically. The method used for the current investigation is based on a recent series of papers that proposed microscopic dynamics based on normal modes to describe superfluidity instead of real-space Cooper pairs. This approach yielded excellent agreement with experimental data for multiple properties and allowed the microscopic behavior underlying these results as well as the basis of universal behavior to be analyzed in detail using the group theoretic basis of this general N-body approach. This microscopic picture is now used to elucidate the roles played by the uncertainty principle and the Pauli principle in determining the energy and character of the lowest allowed quantum state. The squeezing of the Heisenberg uncertainty principle, a well-known phenomenon in other systems, is proposed to play a role in the creation of superfluidity. The suppression of the Pauli principle is introduced as a new phenomenon.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750771","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
The Crossover From Classical to Quantum Transport in a Weakly-Interacting Fermi Gas 弱相互作用费米气体中从经典到量子输运的交叉
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-04 DOI: 10.1007/s10909-026-03430-7
Hadrien Kurkjian
{"title":"The Crossover From Classical to Quantum Transport in a Weakly-Interacting Fermi Gas","authors":"Hadrien Kurkjian","doi":"10.1007/s10909-026-03430-7","DOIUrl":"10.1007/s10909-026-03430-7","url":null,"abstract":"<div><p>We present an exact solution of the quantum kinetic equation of a weakly-interacting two-component unpolarized Fermi gas in the crossover from the degenerate Fermi-liquid regime to the classical Boltzmann gas. We construct families of orthogonal polynomials tailored to each angular momentum channel, enabling a fast and controlled decomposition of the phase-space distribution. This approach yields accurate predictions for the shear viscosity, thermal diffusivity, and spin diffusivity to leading order in the scattering length. We demonstrate that the commonly used variational approximation fails at low temperature—by up to 25%. Our method provides a numerically efficient framework for benchmarking transport in strongly correlated regimes and for simulating the kinetics of quantum gases beyond hydrodynamics.\u0000</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750662","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
Effectiveness of Some 0 dB Cryogenic Microwave Attenuators as Thermal Heatsinks 一些0 dB低温微波衰减器作为散热器的有效性
IF 1.2 3区 物理与天体物理
Journal of Low Temperature Physics Pub Date : 2026-08-03 DOI: 10.1007/s10909-026-03453-0
J. T. Klomp, Haoyun Huang, G. A. Csáthy
{"title":"Effectiveness of Some 0 dB Cryogenic Microwave Attenuators as Thermal Heatsinks","authors":"J. T. Klomp,&nbsp;Haoyun Huang,&nbsp;G. A. Csáthy","doi":"10.1007/s10909-026-03453-0","DOIUrl":"10.1007/s10909-026-03453-0","url":null,"abstract":"<div><p>Coaxial cables are widely used in radiofrequency and microwave cryogenic setups for condensed matter and quantum experiments. Since the inner conductor of coaxes is often in good thermal contact with the sample to be measured, it is desirable to know the phononic heat channeled by the inner conductor. Although cryogenic attenuators are widely used to thermalize the inner conductor of coaxes, to our knowledge, quantitative information is not available. We present data on the effectiveness of three commercially available 0 dB attenuators as thermal heatsinks. In particular, we measured the temperature of the inner pin of several 0 dB attenuators under a heat load. This information will aid in designing and carefully controlling the thermal environment of samples in high-frequency experiments mounted in dilution refrigerators and on nuclear demagnetization stages.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03453-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750801","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
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