Journal of Low Temperature Physics最新文献_第5页

Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping 具有自旋相关非对称跳变的特殊费米子超流动性的维数效应

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-02-03 DOI: 10.1007/s10909-026-03372-0

Soma Takemori, Kazuki Yamamoto, Akihisa Koga

{"title":"Dimensionality Effect on Exceptional Fermionic Superfluidity with Spin-Dependent Asymmetric Hopping","authors":"Soma Takemori, Kazuki Yamamoto, Akihisa Koga","doi":"10.1007/s10909-026-03372-0","DOIUrl":"10.1007/s10909-026-03372-0","url":null,"abstract":"<div><p>Non-Hermitian (NH) quantum systems host exceptional points (EPs), where eigenstates and eigenvalues coalesce, leading to unconventional many-body phenomena absent in Hermitian systems. While NH fermionic systems with complex interactions exhibit superfluid (SF) breakdown with EPs, spin-dependent asymmetric hopping can stabilize a NH superfluid (NH-SF) that coexists with EPs. In this work, we investigate the quasi-one-dimensional NH attractive Fermi-Hubbard model by using NH-BCS theory. We demonstrate that, when the system is regarded as weakly-coupled chains, the exceptional SF phase becomes unstable and metastable (exceptional) SF state appears between the stable SF and normal states. In the one-dimensional limit, the exceptional SFs disappear entirely and EPs only appear on the phase boundary between the normal and SF states. These results reveal how dimensional crossover governs the stability of the exceptional SF, providing the insights into the interplay between dimensionality and dissipation, with potential relevance for experimental implications in ultracold atoms.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03372-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336510","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

Hyperuniform Patterns Nucleated at Low Temperatures: Insight from Vortex Matter Imaged in Unprecedentedly Large Fields of View 低温下成核的超均匀模式：从空前大视场中成像的涡旋物质的洞察力

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-02-02 DOI: 10.1007/s10909-026-03369-9

Alexey Cruz-García, Joaquín Puig, Sergii Pylypenko, Gladys Nieva, Alain Pautraut, Alejandro Benedykt Kolton, Yanina Fasano

引用次数: 0

Microscopic Study of Superconductivity in Presence of External Magnetic Field in Iron Pnictide Superconductors 外加磁场作用下镍铁超导体超导性的微观研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-02-01 DOI: 10.1007/s10909-026-03373-z

Santosh Kumar Barik, Basanta Kumar Sahoo, Bibekananda Panda

{"title":"Microscopic Study of Superconductivity in Presence of External Magnetic Field in Iron Pnictide Superconductors","authors":"Santosh Kumar Barik, Basanta Kumar Sahoo, Bibekananda Panda","doi":"10.1007/s10909-026-03373-z","DOIUrl":"10.1007/s10909-026-03373-z","url":null,"abstract":"<div><p>We study the effect of an external magnetic field on superconducting properties within a mean-field theoretical framework motivated by iron-based superconductors. Inclusion of the magnetic field is introduced solely by Zeeman splitting of quasi-particle energies, corresponding to the Pauli-limited regime, valid in orbital magnetic effects being neglected. Based on the Zubarev Green’s function formalism, the self-consistent equations of the superconducting (SC) order parameter, quasi-particle spectrum, and density of states (DOS) are found. The issue of dependence of the SC gap, DOS and transition temperature on the degree of magnetic field and temperature is analysed in the framework. The findings indicate that the superconductivity was suppressed monotonically with magnetic field and the quasi-particle DOS was subject to Zeeman splitting and its associated changes. The current methodology is not meant to give a quantitative and material-specific description of iron-based superconductors; instead, it provides a qualitative description of the superconducting behaviour of Pauli-limited systems at the mean-field level.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336037","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

Anomaly in the [2, 0] Oscillation Mode of Superfluid (^4)He Pendant Droplets 超流体[2,0]振荡模式异常(^4) He Pendant液滴

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-31 DOI: 10.1007/s10909-026-03371-1

Tomoyuki Tani, Shota Takamatsu, Ryota Yamane, Yuri Ishimoto, Yuki Aoki, Ryuji Nomura

引用次数: 0

Temperature Dependence of the Chemical Potential of a Two-Dimensional Electron Gas in a Half-Filled landau Subband 半填充朗道亚带中二维电子气体化学势的温度依赖性

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-29 DOI: 10.1007/s10909-025-03362-8

P. J. Baymatov, B. T. Abdulazizov, A. A. Saydaliev

{"title":"Temperature Dependence of the Chemical Potential of a Two-Dimensional Electron Gas in a Half-Filled landau Subband","authors":"P. J. Baymatov, B. T. Abdulazizov, A. A. Saydaliev","doi":"10.1007/s10909-025-03362-8","DOIUrl":"10.1007/s10909-025-03362-8","url":null,"abstract":"<div><p>The temperature dependence of the chemical potential in a half-filled Landau subband of a two-dimensional electron gas (2DEG), modeled using a Gaussian density of states (DOS), has been investigated through detailed numerical simulations. A characteristic temperature interval <span>(0-{T}^{*})</span> is identified, within which the chemical potential remains nearly constant and close to the Fermi energy <span>({E}_{F})</span>. The variation of <span>({T}^{*})</span> with the effective mass, filling factor, and broadening parameter <span>(Gamma)</span> is systematically analyzed. Temperature-dependent filling factors of Landau levels are also calculated, clarifying the mechanism by which asymmetric inter-subband transitions drive the deviation of <span>(mu)</span> from <span>({E}_{F})</span>. The results show good agreement with available experimental data for 2DEG systems and provide a solid theoretical basis for interpreting magnetization, entropy, and heat capacity measurements in quantizing magnetic fields. These findings deepen the understanding of the thermodynamics of quantized states in two-dimensional electron gases and underlines their significance for contemporary low-temperature physics.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082435","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

Modeling the Position-Dependent Photon Response in the TES Detector with a 100-(upmu m)-Thick Large Absorber for the WXPT Mission WXPT任务中100- (upmu m)厚大型吸收器TES探测器中位置相关光子响应的建模

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-28 DOI: 10.1007/s10909-026-03367-x

Junjie Zhou, Yifei Zhang, Zhouhui Liu, Zhengwei Li, Xuefeng Lu, Xiaolan Huang, Daikang Yan, Jiangzhen Hong, Zhen Zhao, Zixin Zhao, Liangpeng Xie, Yong Zhao, Congzhan Liu

{"title":"Modeling the Position-Dependent Photon Response in the TES Detector with a 100-(upmu m)-Thick Large Absorber for the WXPT Mission","authors":"Junjie Zhou, Yifei Zhang, Zhouhui Liu, Zhengwei Li, Xuefeng Lu, Xiaolan Huang, Daikang Yan, Jiangzhen Hong, Zhen Zhao, Zixin Zhao, Liangpeng Xie, Yong Zhao, Congzhan Liu","doi":"10.1007/s10909-026-03367-x","DOIUrl":"10.1007/s10909-026-03367-x","url":null,"abstract":"<div><p>We present a simulation framework for the electro-thermal modeling of AlMn transition-edge sensors (TESs) with large-area absorbers, which are essential for the Wide-band X-ray Polarization Telescope (WXPT) to achieve high quantum efficiency across the 3–60 keV science band. The framework incorporates the two-fluid model for the superconducting transition and a dedicated thermal model for the <span>(textrm{SiN}_{textrm{x}})</span> membrane. After experimental validation, the model is applied to quantify position-dependent energy broadening. We implemented an efficient sparse-sampling strategy to map the spatial response. Under a fixed heat-capacity budget, the position-induced broadening is contained below <span>(6.97 textrm{eV})</span> @ <span>(59.5 textrm{keV})</span>. This result is achieved for absorbers with a side length of <span>(sim 1 textrm{mm})</span> and supporting pillar widths under <span>(50 upmu textrm{m})</span>, further confirming the design’s effectiveness. This work provides a predictive simulation tool and concrete geometrical constraints to guide the design of the WXPT focal-plane array.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082566","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

Impact of Finite Phonon Energy and Transverse Component of Phonon Wave Vector on Low-Temperature Transport in Degenerate Quantum Wells 有限声子能量和声子波矢量横向分量对简并量子阱低温输运的影响

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-26 DOI: 10.1007/s10909-026-03365-z

S. Nag, B. Roy, D. P. Bhattacharya

{"title":"Impact of Finite Phonon Energy and Transverse Component of Phonon Wave Vector on Low-Temperature Transport in Degenerate Quantum Wells","authors":"S. Nag, B. Roy, D. P. Bhattacharya","doi":"10.1007/s10909-026-03365-z","DOIUrl":"10.1007/s10909-026-03365-z","url":null,"abstract":"<div><p>The present theoretical analysis is carried out in order to study some aspects of the electron transport in a degenerate two-dimensional electron gas (2DEG) at low lattice temperature, taking into account some particular features. These features, in contrast to the usual practice, include the inelasticity of the interaction of the carriers with the intravalley acoustic phonons, the true phonon distribution function setting aside the equipartition approximation for the same, and the transverse component of the three-dimensional phonon wave vector in the light of Ridley’s momentum conservation approximation. The scattering rate and the corresponding zero-field mobility are evaluated for an ensemble of degenerate carriers, confined in a triangular quantum well at the AlGaAs/GaAs interface, over a range of the lattice temperatures and the degeneracy levels. Numerical results demonstrate that the degeneracy parameter, the inelastic electron–phonon interaction, and the transverse component of phonon wave vector contribute significantly to effect the scattering and mobility characteristics compared to traditional theories, particularly in the low-temperature regime. The results which are obtained here seem to be stimulating and thus call forth more studies in the same framework as that of the present analysis.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082702","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

Chain of Unusual Radiating Josephson Vortices 异常辐射约瑟夫森涡链

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-23 DOI: 10.1007/s10909-026-03366-y

A. S. Malishesvkii, S. A. Uryupin

引用次数: 0

The theory of planar ballistic SNS junctions 平面弹道SNS结点理论

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-19 DOI: 10.1007/s10909-025-03360-w

Edouard Sonin

{"title":"The theory of planar ballistic SNS junctions","authors":"Edouard Sonin","doi":"10.1007/s10909-025-03360-w","DOIUrl":"10.1007/s10909-025-03360-w","url":null,"abstract":"<div><p>The paper presents the theory of planar ballistic SNS junctions with equal Fermi velocities and effective masses in all layers. The theory takes into account phase gradients in superconducting layers commonly ignored in the past. At <span>(T=0)</span>, the current-phase relation was derived for any thickness <i>L</i> of the normal layer in the model of the steplike pairing potential model analytically. The obtained current-phase relation is essentially different from that in theory neglecting phase gradients, especially in the limit <span>(Lrightarrow 0)</span> (short junction). The analysis resolves the problem with the charge conservation law in the steplike pairing potential model. The current-phase relation at temperatures exceeding the energy spacing between Andreev levels but less than the critical temperature was also calculated numerically. The current at these temperatures is temperature independent and decreases with growing <i>L</i> as <span>(1/L^4)</span>. The previous theory predicted the current exponentially decreasing with growing <i>T</i> and <i>L</i>. Possible implications of the analysis for planar junctions with non-equal Fermi velocities and for non-planar junctions (narrow normal bridge between two bulk superconductors) are also discussed.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03360-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026908","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

Electric-Field-Induced Insulator-to-Metal and Superconducting Transitions in Bulk Polycrystalline MoS2: Role of the Gate Electrode Configuration 电场诱导的多晶二硫化钼绝缘体到金属和超导转变：栅极结构的作用

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-16 DOI: 10.1007/s10909-025-03363-7

Y. Shimazu, T. Miyatake, K. Ueno, H. Watanabe, M. Uehara

{"title":"Electric-Field-Induced Insulator-to-Metal and Superconducting Transitions in Bulk Polycrystalline MoS2: Role of the Gate Electrode Configuration","authors":"Y. Shimazu, T. Miyatake, K. Ueno, H. Watanabe, M. Uehara","doi":"10.1007/s10909-025-03363-7","DOIUrl":"10.1007/s10909-025-03363-7","url":null,"abstract":"<div><p>Layered transition metal dichalcogenides, such as MoS<sub>2</sub>, are promising platforms for exploring electric-field-controlled phenomena. While gate-induced superconductivity has been extensively studied in single-crystalline MoS<sub>2</sub> flakes, the behavior of bulk polycrystalline MoS<sub>2</sub> under similar conditions remains unexplored. In this study, we investigate electric-field-induced phase transitions in bulk polycrystalline MoS<sub>2</sub> using an ionic liquid (IL) gate, focusing on the role of electrode configuration and contact proximity in transport properties, and on the emergence of superconductivity in bulk samples. Three different electrode configurations were employed to examine the impact of contact geometry. In setups with distant contacts, the samples exhibited insulating behavior down to 1.8 K, whereas in the configuration with contacts placed close to the gate electrode, a clear metal–insulator transition and the onset of superconductivity were observed, with a maximum <i>T</i><sub>c</sub> of 4.2 K. Analysis revealed that the contact resistance strongly depends on the distance between the gate electrode and the voltage/current leads, differing by nearly an order of magnitude between contacts located near and far from the gate. The critical apparent sheet resistance at the metal–insulator transition was estimated to be ~ 50 Ω, much lower than the quantum resistance, likely due to penetration of the IL into the granular polycrystalline structure. These findings highlight the crucial role of electrode configuration in IL gating of bulk materials and demonstrate that electrostatic doping can induce superconductivity in polycrystalline systems, extending the scope of gate-controlled quantum phenomena to materials for which high-quality single crystals are difficult to obtain.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03363-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145983338","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