Journal of Low Temperature Physics最新文献_第2页

Oscillations of Longitudinal Magnetoresistance in Thin Semiconductor Films with a Parabolic Potential Profile 具有抛物线势分布的半导体薄膜中纵向磁电阻的振荡

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-08 DOI: 10.1007/s10909-026-03408-5

Kh. A. Hasanov, J. I. Huseinov, V. V. Dadasheva, A. Yu. Hamzaeva, S. R. Bagirova, V. İ. Hajieva

{"title":"Oscillations of Longitudinal Magnetoresistance in Thin Semiconductor Films with a Parabolic Potential Profile","authors":"Kh. A. Hasanov, J. I. Huseinov, V. V. Dadasheva, A. Yu. Hamzaeva, S. R. Bagirova, V. İ. Hajieva","doi":"10.1007/s10909-026-03408-5","DOIUrl":"10.1007/s10909-026-03408-5","url":null,"abstract":"<div>This work presents a theoretical investigation of longitudinal magnetoresistance in thin semiconductor films with a parabolic confining potential subjected to a strong quantizing magnetic field. The case of a degenerate electron gas with weak filling of the conduction band is considered. Based on the kinetic equation approach, an analytical expression for the longitudinal electrical conductivity is derived, taking into account the spin splitting of Landau levels. A numerical analysis of the magnetoresistance behavior is carried out for nanostructures based on (text{GaAs}) and (text{InSb}) at a temperature of (4.2text{ K}.) The results demonstrate that quantum oscillations of magnetoresistance arise in such systems, and a negative longitudinal magnetoresistance can occur even under conditions of strong degeneracy. This behavior is attributed to the quantization of electron motion in the transverse direction and the spin splitting of energy levels in a magnetic field. The obtained results indicate that such nanostructures represent promising model systems for investigations in the fields of spintronics and magnetoelectronics.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642847","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

Magnetoplasmon Engineering in Microchannel-Confined Electrons on Helium: Edge Modes, Derivation of Spectra, and Quantitative Coherence Analysis 氦上微通道限制电子的磁等离子体工程：边缘模式、谱的推导和定量相干分析

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-05 DOI: 10.1007/s10909-026-03401-y

Airat G. Kiiamov, Dmitrii A. Tayurskii

{"title":"Magnetoplasmon Engineering in Microchannel-Confined Electrons on Helium: Edge Modes, Derivation of Spectra, and Quantitative Coherence Analysis","authors":"Airat G. Kiiamov, Dmitrii A. Tayurskii","doi":"10.1007/s10909-026-03401-y","DOIUrl":"10.1007/s10909-026-03401-y","url":null,"abstract":"<div>We present a comprehensive theoretical framework for engineering magnetoplasmons in microchannel-confined electrons on superfluid helium under perpendicular magnetic field control. By extending established magnetoplasmon theory to realistic confined geometries, we rigorously derive the dispersion relations incorporating finite-size effects, smooth electrostatic boundary conditions, and the exact Coulomb kernel for channel geometry. Applied magnetic fields transform gapless plasmons into structured magnetoplasmon spectra with tunable frequencies spanning 5–40 GHz. We specifically address the nature of edge magnetoplasmons in the non-degenerate regime characteristic of electrons on helium, distinguishing them from their semiconductor counterparts through the analysis of soft-wall confinement potentials. Our quantitative decoherence analysis explicitly defines the coupling to the electromagnetic environment and evaluates five primary damping channels. We show that while environmental coupling dominates ((T_2=2.1)–35 (mu )s), optimized impedance engineering can enhance coherence times toward the intrinsic limit (({sim }100~mu )s), establishing a robust foundation for collective-mode quantum devices.\u0000</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642667","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

Magnetic Properties and Magnetocaloric Effect of Borophene Monolayer Doped: A Monte Carlo Study 掺杂硼罗芬单层的磁性能和磁热效应：蒙特卡罗研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-05 DOI: 10.1007/s10909-026-03405-8

A. Azdouh, Z. Elmghabar, A. El Ghazrani, A. Elidrysy, S. Harir, R. Ahl Laamara

引用次数: 0

Peltier Cooling in Corbino-Geometry Quantum Hall Systems corbino -几何量子霍尔系统中的Peltier冷却

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-03 DOI: 10.1007/s10909-026-03397-5

Akira Endo, Yoshiaki Hashimoto

{"title":"Peltier Cooling in Corbino-Geometry Quantum Hall Systems","authors":"Akira Endo, Yoshiaki Hashimoto","doi":"10.1007/s10909-026-03397-5","DOIUrl":"10.1007/s10909-026-03397-5","url":null,"abstract":"<div>Quantum Hall systems having Corbino geometry are expected to have a large Peltier coefficient (Pi _{rr}) in the quantum Hall plateau region. We present an analytic formula for (Pi _{rr}) calculated employing the spectral conductivity obtained based on the self-consistent Born approximation. The coefficient (Pi _{rr}) is shown to have a large negative (positive) value just above (below) an integer Landau-level filling, with the absolute value (|Pi _{rr}|) increasing with decreasing temperature or decreasing disorder, and approaching the saw-tooth shape (- (E_{N_textrm{F} sigma _textrm{F}}-zeta )/e) in the limit of vanishing disorder, where (E_{N_textrm{F} sigma _textrm{F}}) is the highest occupied Landau level and (zeta ) is the chemical potential. As an initial attempt to experimentally observe the effect of the large (|Pi _{rr}|), we measure the electron temperature (T_textrm{out}) near the outer perimeter of a Corbino disk, applying a radial dc current (I_textrm{dc}). The temperature (T_textrm{out}) is observed to increase or decrease depending on the direction of (I_textrm{dc}) and the sign of (Pi _{rr}) as expected from the Peltier effect. Notably, (T_textrm{out}) becomes lower than the bath temperature for outward (inward) (I_textrm{dc}) in the region where (Pi _{rr} < 0) ((Pi _{rr} > 0)).</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03397-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606724","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 Experimental Study of a Thermosiphon-Based Passive Heat Switch in an Integrated Adiabatic Demagnetization and Dilution Refrigerator System 热虹吸被动热开关在综合绝热退磁稀释制冷系统中的设计与实验研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-01 DOI: 10.1007/s10909-026-03388-6

Byeungcheol An, Minseung Ku, Jaehwan Jeong, Sangkwon Jeong

{"title":"Design and Experimental Study of a Thermosiphon-Based Passive Heat Switch in an Integrated Adiabatic Demagnetization and Dilution Refrigerator System","authors":"Byeungcheol An, Minseung Ku, Jaehwan Jeong, Sangkwon Jeong","doi":"10.1007/s10909-026-03388-6","DOIUrl":"10.1007/s10909-026-03388-6","url":null,"abstract":"<div>This study proposes a thermal connection/isolation strategy to achieve less than 1 K pre-cooling required for Dilution Refrigerator (DR) operation in an integrated cryogenic system composed of a 4 K GM cryocooler, evaporative cooler, an Adiabatic Demagnetization Refrigerator (ADR), and a DR. We install a gravity-assisted thermosiphon-based passive heat switch (PHS) above the Gadolinium Gallium Garnet ADR stage, above the Still, and above the Mixing Chamber (MXC). An energy-balance model was used to estimate the attainable temperatures of the refrigeration chain, whereas convection and conduction models were used to design the PHS. In the OFF mode, considering conduction, the lower boundary warms from 2.2 K to 3.0 K in approximately 1.7 h, and the initial conduction heat inflow is estimated at ~ 319 μW—sufficiently low relative to the preparation time between cycles, indicating adequate thermal isolation. In the ON mode, a natural-convection correlation yields an effective heat transport of 11 mW, corresponding to a switching performance ratio about 36 times higher than in the OFF state. Experimentally, the Still pressure of 1.6 kPa was achieved, confirming the conceptual validity of the thermosiphon PHS. These results provide practical guidance for DR-interface design and robust pre-cooling in systems with small He-3 inventory, especially when combined with MXC pre-cooling pathway optimization and reduction of parasitic heat loads.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03388-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606755","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

Thermal Counterflow Around a Spherical Bubble Formed Due to a Hot Filament in Superfluid 4He 超流体4He中热丝形成的球形气泡周围的热逆流

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-03-27 DOI: 10.1007/s10909-026-03400-z

Ying-Hsi Wu, Wataru Zhuang, Qi-Yang Zhou, Li-Yang Chuang, Yu-Lin Lu, Yu-Ying Ho, Fang-Tien Lin, Fang-Yi Li, Ben-Li Young, Wen-Bin Jian, Kimitoshi Kono

{"title":"Thermal Counterflow Around a Spherical Bubble Formed Due to a Hot Filament in Superfluid 4He","authors":"Ying-Hsi Wu, Wataru Zhuang, Qi-Yang Zhou, Li-Yang Chuang, Yu-Lin Lu, Yu-Ying Ho, Fang-Tien Lin, Fang-Yi Li, Ben-Li Young, Wen-Bin Jian, Kimitoshi Kono","doi":"10.1007/s10909-026-03400-z","DOIUrl":"10.1007/s10909-026-03400-z","url":null,"abstract":"<div>A thin tungsten filament glowing without boiling in helium-4 is a classic and widely used demonstration of infinite thermal conductivity of superfluidity. Under normal conditions, the filament exhibits Ohmic conductivity, referred to as \"cold\" state. However, this behavior abruptly changes when a helium vapor bubble forms around the filament, which is referred to as the \"hot\" state. The intense thermal counterflow generated by the hot filament can trigger turbulence within the superfluid. To investigate this quantum turbulence, which attenuates second sound, we constructed a second-sound resonator. A tungsten filament was positioned in the center of the resonator to create a radial thermal counterflow, serving as a source of turbulence. Our observations reveal that the attenuation of the second-sound resonance correlates with the filament’s Joule heating power. Surprisingly, quantum turbulence associated with thermal counterflow affects second-sound attenuation in markedly different ways depending on whether the filament is in the cold or hot state—even when the Joule heating power remains the same.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03400-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147562064","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

Generalized Feynman Approach and Phonon–Roton Excitations for Coulomb Systems 库仑系统的广义费曼方法和声子-罗顿激励

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-03-22 DOI: 10.1007/s10909-026-03395-7

S. A. Trigger

引用次数: 0

Substitution Effect of Ba on Transport Properties of the Layered Cobalt Oxypnictide (Sr(_{1-x})Ba(_x))(_2)ScCoPO(_3) with CoP Layers Ba对层状钴氧nictide (Sr (_{1-x}) Ba (_x)) (_2) ScCoPO (_3)与CoP层输运性质的取代作用

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-03-21 DOI: 10.1007/s10909-026-03396-6

Satoshi Okada, Naoki Ohkubo, Shuichi Ban

{"title":"Substitution Effect of Ba on Transport Properties of the Layered Cobalt Oxypnictide (Sr(_{1-x})Ba(_x))(_2)ScCoPO(_3) with CoP Layers","authors":"Satoshi Okada, Naoki Ohkubo, Shuichi Ban","doi":"10.1007/s10909-026-03396-6","DOIUrl":"10.1007/s10909-026-03396-6","url":null,"abstract":"<div>We investigated the transport properties of Ba-doped cobalt oxypnictides, (Sr(_{1-x})Ba(_x))(_2)ScCoPO(_3) (x = 0.05 and 0.10), synthesized via a solid-state reaction. The objective was to clarify whether lattice expansion alone induces the anomalous Seebeck coefficient (S) sign inversion previously observed in Fe-doped Sr(_2)ScCoPO(_3). XRD analysis showed that Ba-substitution in the Sr(_2)ScO(_3) blocking layer successfully expanded the lattice constants.The resistivity measurements revealed metallic behavior for all samples. While the absolute value of S (|S|) was larger than that of the undoped sample (x = 0), it showed no significant dependence on the Ba concentration x. Furthermore, the sign of S remained negative without any inversion down to 20 K. These findings indicate that structural expansion does not significantly alter the multi-band electronic structure near the Fermi level. We conclude that direct electronic modification of the conduction layer is the primary driver for the sign inversion.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560351","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

Triple-Core Structure of the Double-Core Vortex in Superfluid (^3)He-B 超流体(^3) He-B中双核涡的三核结构

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-03-17 DOI: 10.1007/s10909-026-03394-8

Riku Rantanen

引用次数: 0

Correction: Hyperuniform Patterns Nucleated at Low Temperatures: Insight from Vortex Matter Imaged in Unprecedentedly Large Fields of View 更正：在低温下成核的超均匀模式：在空前大的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 : 2026-03-09 DOI: 10.1007/s10909-026-03392-w

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

引用次数: 0