The European Physical Journal D最新文献

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Collision-induced population distribution of the energy acceptor H2(v = 1, J = 1–6) in D2–H2 mixtures and its temperature dependence 碰撞诱导能量受体H2(v = 1, J = 1 - 6)在D2-H2混合物中的居群分布及其温度依赖性
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-12 DOI: 10.1140/epjd/s10053-026-01200-4
Yuhao Wu, Lin Mao, Jing Liu, Yaqi Zhang, Jiaxin Lin, Aihemaitijiang Sidike
{"title":"Collision-induced population distribution of the energy acceptor H2(v = 1, J = 1–6) in D2–H2 mixtures and its temperature dependence","authors":"Yuhao Wu,&nbsp;Lin Mao,&nbsp;Jing Liu,&nbsp;Yaqi Zhang,&nbsp;Jiaxin Lin,&nbsp;Aihemaitijiang Sidike","doi":"10.1140/epjd/s10053-026-01200-4","DOIUrl":"10.1140/epjd/s10053-026-01200-4","url":null,"abstract":"<div><p>D<sub>2</sub>(1,12) molecules were selectively excited using a stimulated Raman pumping technique, and time-resolved coherent anti-Stokes Raman scattering (CARS) signals were recorded in both pure D<sub>2</sub> and D<sub>2</sub>–H<sub>2</sub> mixed systems. By analyzing the measurements within the Stern–Volmer framework, the collisional relaxation rate coefficients of the D<sub>2</sub>(1,12) state at 295 K were determined. In the pure D<sub>2</sub> system, the D<sub>2</sub>–D<sub>2</sub> self-relaxation rate coefficient was found to be 1.76 × 10<sup>−14</sup> cm<sup>3</sup> s<sup>−1</sup>. In contrast, in the D<sub>2</sub>–H<sub>2</sub> system, the relaxation rate coefficient for D<sub>2</sub>–H<sub>2</sub> collisions was 2.77 × 10<sup>−14</sup> cm<sup>3</sup> s<sup>−1</sup>, while the D<sub>2</sub>–D<sub>2</sub> self-relaxation rate coefficient decreased to 0.45 × 10<sup>−14</sup> cm<sup>3</sup> s<sup>−1</sup>. These results indicate that the overall collisional relaxation rate in the D<sub>2</sub>–H<sub>2</sub> system is approximately 1.8 times larger than that in pure D<sub>2</sub>. The introduction of H<sub>2</sub> therefore significantly enhances near-resonant rotational–vibrational (R–V) energy transfer between D<sub>2</sub>(1,12) and H<sub>2</sub>, leading to more efficient quenching of the excited D<sub>2</sub>(1,12) state.Furthermore, within the temperature range of 295–453 K, systematic scanning CARS measurements were performed to probe H<sub>2</sub> molecules in the <i>v</i> = 1 vibrational states following D<sub>2</sub>–H<sub>2</sub> collisions. With increasing temperature, the populations of the H<sub>2</sub>(<i>v</i> = 1, <i>J</i> = 3, 4) levels increase, whereas that of H<sub>2</sub>(<i>v</i> = 1, <i>J</i> = 1) decreases. In contrast, the populations of the H<sub>2</sub>(<i>v</i> = 1, <i>J</i> = 2, 5, 6) levels exhibit relatively weak temperature dependence, providing insight into collision-induced R–V energy transfer mechanisms in the D<sub>2</sub>–H<sub>2</sub> system.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div><div><p>Population distribution on rotational energy levels of H<sub>2</sub> molecules after collision with ro-vibrationally excited D<sub>2</sub>(<i>v</i> = 1, <i>J</i> = 12) molecules as a function of temperature in the range of 295–453 K, when the mole fraction of H<sub>2</sub> is 0.5. 2)</p></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Qualitative differences in the robust controllability of model two-qubit systems 模型双量子位系统鲁棒可控性的性质差异
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-12 DOI: 10.1140/epjd/s10053-026-01181-4
Anirban Dey, Mattias T. Johnsson, Daniel Burgarth
{"title":"Qualitative differences in the robust controllability of model two-qubit systems","authors":"Anirban Dey,&nbsp;Mattias T. Johnsson,&nbsp;Daniel Burgarth","doi":"10.1140/epjd/s10053-026-01181-4","DOIUrl":"10.1140/epjd/s10053-026-01181-4","url":null,"abstract":"<p>Robust control of quantum gates under parameter uncertainty is essential for reliable quantum technologies. While complete knowledge of a Hamiltonian enables accurate control, realistic systems often involve uncertain parameters, making controllability challenging. We investigate two model Hamiltonians with partially unknown continuous parameters and assess their robust controllability using a unified framework that combines both theoretical analysis and numerical simulation. Theoretical analysis is grounded in a Lie-algebraic framework, complemented by a numerical method based on discretizing the continuous uncertain parameter. Furthermore, we introduce a modified fidelity functional with a penalty term to optimize control pulses, thereby enhancing robustness against parameter uncertainty. Within this framework, we analyze two representative systems, revealing qualitative differences in their controllability.</p><p>The figure shows how the minimum control time <span>(T_{varepsilon }(N))</span> scales with the ensemble size <i>N</i> for System A and System B. The black dots on the curve depict the minimum control time <span>(T_{varepsilon }(N))</span> for a target error <span>(varepsilon = 10^{-3})</span> within <span>(omega in [1, 2])</span>. Solid lines indicate the scaling behaviour for the CNOT gate and dashed lines correspond to the scaling for the generic unitary <i>U</i> given in Eq. (25)</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Light-based gravimetry 光学密度测定
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-08 DOI: 10.1140/epjd/s10053-026-01188-x
Edgar Zuniga, Eduardo Gomez
{"title":"Light-based gravimetry","authors":"Edgar Zuniga,&nbsp;Eduardo Gomez","doi":"10.1140/epjd/s10053-026-01188-x","DOIUrl":"10.1140/epjd/s10053-026-01188-x","url":null,"abstract":"<p>An atomic gravimeter works by splitting the atomic wave function along the vertical axis and recombining it in a Mach-Zehnder interferometer. We propose that the same idea could work by splitting classical light in a Michelson interferometer and that both systems are described by analogous expressions. In particular, although they seem different at first glance, they give identical sensitivity for equal measurement times. We show that the setup of this light-based gravimeter removes the complexity present in atomic gravimetry due to the atomic manipulation, but comes at the expense of having other types of more demanding experimental requirements. The differences between the matter-based and the light-based gravimetry can be traced down to the propagation velocity of the wave that interferes, which results in the requirement of very long arms for the light-based gravimeter. The outstanding fact that a massless particle such as the photon could be used to measure gravity is enabled by the Equivalence Principle. These findings give a new perspective for future research in gravimetry.</p><p>A Michelson interferometer is capable of measuring gravity without the use of any test mass. In a gravitational field, the gravitational redshift shifts the wave vector from <span>(k_0)</span> to <span>(k = k_0(1 - Delta V/c^2))</span>, producing a measurable phase shift <span>(Delta Phi _g approx k_0 g T^2)</span> analogous to that of an atomic Mach-Zehnder gravimeter. Both systems yield identical sensitivity for equal measurement times, with the key difference rooted in the propagation velocity of the interfering wave.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
High repetition rate HHG sources enabled by superradiant MIR-FEL with four-mirror cavity 四镜腔超辐射MIR-FEL实现高重复率HHG源
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-06 DOI: 10.1140/epjd/s10053-026-01189-w
Duohan Liu, Nanshun Huang, Haixiao Deng
{"title":"High repetition rate HHG sources enabled by superradiant MIR-FEL with four-mirror cavity","authors":"Duohan Liu,&nbsp;Nanshun Huang,&nbsp;Haixiao Deng","doi":"10.1140/epjd/s10053-026-01189-w","DOIUrl":"10.1140/epjd/s10053-026-01189-w","url":null,"abstract":"<p>Driven by the favorable ponderomotive energy scaling for high-harmonic generation (HHG), high-repetition-rate mid-infrared (MIR) sources are of great interest for extending attosecond spectroscopy into the X-ray regime. In this work, a <span>(6~upmu text {m})</span> FEL oscillator operating in the superradiant regime is proposed as a potential HHG driver. We systematically investigate the performance of a four-mirror “bow-tie” ring resonator in which the intracavity MIR power can be utilized, in comparison with a conventional two-mirror outcoupling resonator. It is demonstrated that the intracavity configuration, facilitated by precise cavity detuning and external seeding, generates carrier-envelope phase stable, few-cycle MIR pulses with peak intensity of <span>(5.0 times 10^{14}~text {W}/{text {cm}}^2)</span>, while the same intensity can be offered by a two-mirror outcoupling resonator only if the focal spot size can be focused down to wavelength scale. Further single-atom response simulations in Helium indicate that this source can extend the cutoff energy of HHG to <span>( 5.35~text {keV})</span>, offering a promising and compact way for coherent, high-repetition-rate X-ray generation.\u0000</p><p>Schematic of the proposed 4-mirror intracavity mid-infrared free-electron laser oscillator (MIR-FELO). Tight focusing via the cavity mirrors yields an ultra-high peak intensity at the internal focal point, satisfying the stringent requirements of a high-repetition-rate, high-power, and long-wavelength driver for high-harmonic generation (HHG).</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Fabrication of a binary Zn–Al nanocomposite via plasma jet technique and its antibacterial activity 等离子体喷射法制备二元锌铝纳米复合材料及其抗菌性能
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-05 DOI: 10.1140/epjd/s10053-026-01199-8
Wassan D. Hussain, Kadhim A. Aadim, Mohammed H. Jawad
{"title":"Fabrication of a binary Zn–Al nanocomposite via plasma jet technique and its antibacterial activity","authors":"Wassan D. Hussain,&nbsp;Kadhim A. Aadim,&nbsp;Mohammed H. Jawad","doi":"10.1140/epjd/s10053-026-01199-8","DOIUrl":"10.1140/epjd/s10053-026-01199-8","url":null,"abstract":"<div><p>In this study, a binary zinc–aluminum oxide (Zn–Al) nanocomposite was prepared using an environmentally friendly and economical method, atmospheric non-thermal plasma jet. This technique is considered clean because it does not require the use of any chemicals and allows for significant control over the shape and size of the produced nanoparticles. Argon gas was used during the reaction. The plasma spectroscopic results showed that the electron temperature reached 0.0765 eV and the electron density was equal to 7.32 × 10<sup>17</sup> cm<sup>−3</sup>. The nanoparticles were prepared at three different times (2, 4, and 6 min), and the produced samples were characterized using different techniques. XRD results showed that the peaks became more pronounced with increasing preparation time, and the crystallite size decreased from 24.7 to 14.6 nm. FE-SEM images revealed that the resulting particles changed from clustered to spherical, with the average particle size decreasing from 43.5 to 26.5 nm. AFM measurements also showed that the particle surface roughness decreased from 19.8 to 11.3 nm. Zeta potential analysis results showed that the resulting particles have high stability in liquid media and are directly proportional to the preparation time, decreasing from − 20.7 to − 37.5 mV. It was also demonstrated that the nanoparticles are highly active against Gram-negative and Gram-positive bacteria, with <i>E</i>. <i>coli</i> being inhibited at 25 mM in 6 min and <i>S</i>. <i>aureus</i> being inhibited in 21 mm of the biological activity of the prepared samples.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div><div><p>Schematic illustration of Zn–Al nanocomposite synthesis by atmospheric plasma jet and its antibacterial activity</p></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Increasing the secret key rates and point-to-multipoint extension for experimental coherent-one-way quantum key distribution protocol 提高实验相干-单向量子密钥分发协议的密钥速率和点对多点扩展
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-04 DOI: 10.1140/epjd/s10053-026-01180-5
Venkat Abhignan, Mohit Mittal, Aditi Das, Megha Shrivastava
{"title":"Increasing the secret key rates and point-to-multipoint extension for experimental coherent-one-way quantum key distribution protocol","authors":"Venkat Abhignan,&nbsp;Mohit Mittal,&nbsp;Aditi Das,&nbsp;Megha Shrivastava","doi":"10.1140/epjd/s10053-026-01180-5","DOIUrl":"10.1140/epjd/s10053-026-01180-5","url":null,"abstract":"<p>Using quantum key distribution (QKD) protocols, a secret key is created between two distant users (transmitter and receiver) at a particular key rate. Quantum technology can facilitate secure communication for cryptographic applications, combining QKD with one-time pad (OTP) encryption. In order to ensure the continuous operation of QKD in real-world networks, efforts have been concentrated on optimizing the use of experimental components and effective QKD protocols to improve secret key rates and increase the transmission between multiple users. Generally, in experimental implementations, the secret key rates are limited by single-photon detectors, which are used at the receivers of QKD and create a bottleneck due to their limited detection rates (detectors with low detection efficiency and high detector dead-time). We experimentally show that secret key rates can be increased by combining the time-bin information of two such detectors on the data line of the receiver for the coherent-one-way (COW) QKD protocol with a minimal increase in quantum bit error rate (QBER, the proportion of erroneous bits). Further, we implement a point-to-multipoint COW QKD protocol, introducing an additional receiver module. The three users (one transmitter and two receivers) share the secret key in post-processing, relying on OTP encryption. Typically, the dual-receiver extension can improve the combined secret key rates of the system; however, one has to optimize the experimental parameters to achieve this within security margins. These methods are general and can be applied to any implementation of the COW protocol.</p><p>Proposed Topology for Quantum Key Agreement</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Halogenation-induced enhancement of positron binding in small hydrocarbons 卤化诱导的小碳氢化合物正电子结合增强
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-03 DOI: 10.1140/epjd/s10053-026-01194-z
Miu Ashiba, Daisuke Yoshida, Yukiumi Kita, Tomomi Shimazaki, Toshiyuki Takayanagi, Masanori Tachikawa
{"title":"Halogenation-induced enhancement of positron binding in small hydrocarbons","authors":"Miu Ashiba,&nbsp;Daisuke Yoshida,&nbsp;Yukiumi Kita,&nbsp;Tomomi Shimazaki,&nbsp;Toshiyuki Takayanagi,&nbsp;Masanori Tachikawa","doi":"10.1140/epjd/s10053-026-01194-z","DOIUrl":"10.1140/epjd/s10053-026-01194-z","url":null,"abstract":"<p>We investigated relationships between positron affinities and molecular properties of halogenated hydrocarbons using the electron–positron correlation–polarization potential calculation with the generalized gradient approximation. It is well established experimentally that, for the simple hydrocarbons and their typical derivatives, the electrostatic properties, such as the permanent dipole moment and dipole polarizability, strongly influence the positron affinity. In addition, the number of <span>(pi )</span> bonds, reflecting the <span>(pi )</span>-electron contributions to the molecular polarizability or heteroatomic bond polarity, are effective factors in increasing the positron affinity. In this work, for the family of the halogenated hydrocarbons, the dataset is expanded by incorporating ten fluorinated, chlorinated, and brominated derivatives of acetylene, for which experimental positron affinities are unavailable, to our previously computed set of 75 halogenated hydrocarbons with including ethane and ethylene derivatives. The calculated positron affinities for 53 molecules, excluding fluorinated species due to their near-zero positron affinities, revealed no significant difference between halogenated acetylene-based and ethylene/ethane-based species, while the identity of the substituted halogen atoms and the degree of halogenation have substantial effects on the observed differences. The decomposition analysis of the electron–positron contact density into the electronic orbital contributions showed that, for acetylene-based systems, the higher occupied <span>(pi )</span> orbitals make prominent contributions commonly, whereas for halogenated systems, such (near-)highest occupied states are dominated by halogen-derived lone pair electrons. The bound positrons for halogenated unsaturated hydrocarbons extend from the vicinity of the carbon–carbon bond axis toward the substituted halogen atoms, manifesting significance of local polarizabilities of halogen atoms.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-026-01194-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Solvent-dependent vibrational coupling and coherence decay of the nitro-substituent mode revealed by ultrafast spectroscopy 超快光谱揭示的溶剂型振动耦合和氮取代基模式相干衰减
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-06-01 DOI: 10.1140/epjd/s10053-026-01186-z
Zihang Ding, Kefan Cao, Xiaosong Liu
{"title":"Solvent-dependent vibrational coupling and coherence decay of the nitro-substituent mode revealed by ultrafast spectroscopy","authors":"Zihang Ding,&nbsp;Kefan Cao,&nbsp;Xiaosong Liu","doi":"10.1140/epjd/s10053-026-01186-z","DOIUrl":"10.1140/epjd/s10053-026-01186-z","url":null,"abstract":"<p>In this experimental study, time-resolved coherent anti-Stokes Raman scattering (TR-CARS) spectroscopy, combined with frequency-resolved Fourier-transform (FT) analysis, is used to investigate vibrational coupling and coherence dynamics of the nitro-substituent mode in nitrobenzene and in binary mixtures with methanol and sulfolane. Nitrobenzene is chosen as a representative nitro-aromatic probe, while methanol and sulfolane serve as hydrogen-bonding and non-hydrogen-bonding solvent environments, respectively, enabling discrimination between solvent-specific intermolecular effects and more general solvent environment effects. Unlike previous studies that mainly focused on general vibrational energy transfer, phenyl-group effects, or substituent number effects, the present work examines whether the nitro-substituent mode at 1335 cm<span>(^{-1})</span> acts as a mode-specific coupling center and whether its coherence decay is sensitive to the surrounding solvent environment. The results show that the 1335 cm<span>(^{-1})</span> nitro-substituent mode participates in intramolecular coupling with the nitrobenzene ring modes at 1108 and 1007 cm<span>(^{-1})</span> and in intermolecular coupling with the methanol C–H bending mode at 1470 cm<span>(^{-1})</span> and the sulfolane ring torsional mode at 1249 cm<span>(^{-1})</span>. Time-domain analysis further shows a clear solvent dependence of the coherence dephasing time of the nitro-substituent mode, which is 1099 ± 12.5 fs in neat nitrobenzene, 1006 ± 23 fs in the nitrobenzene–sulfolane mixture, and 650 ± 14 fs in the nitrobenzene–methanol mixture. The pronounced shortening in methanol is consistent with a methanol-specific intermolecular interaction, plausibly involving hydrogen bond donation to the nitro group, which may introduce an additional vibrational dephasing channel and accelerate coherence loss. These findings provide comparative spectroscopic evidence that the coherence dephasing of the nitro-substituent mode is highly sensitive to the local solvent environment and is likely influenced by hydrogen bond-mediated interactions.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Critical speed of a binary superfluid of light 二元光超流体的临界速度
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-05-31 DOI: 10.1140/epjd/s10053-026-01176-1
Pierre-Élie Larré, Claire Michel, Nicolas Cherroret
{"title":"Critical speed of a binary superfluid of light","authors":"Pierre-Élie Larré,&nbsp;Claire Michel,&nbsp;Nicolas Cherroret","doi":"10.1140/epjd/s10053-026-01176-1","DOIUrl":"10.1140/epjd/s10053-026-01176-1","url":null,"abstract":"<p>We theoretically study the critical speed for superfluid flow of a two-dimensional miscible binary superfluid of light past a polarization-sensitive optical obstacle. This speed corresponds to the maximum mean flow velocity below which dissipation is absent. In the weak-obstacle regime, linear-response theory shows that the critical speed is set by Landau’s criterion applied to the density and spin Bogoliubov modes, whose relative ordering can be inverted due to saturation of the optical nonlinearity. For obstacles of arbitrary strength and large spatial extent, we determine the critical speed from the conditions for strong ellipticity of the stationary hydrodynamic equations within the hydraulic and incompressible approximations. Numerical simulations in this regime reveal that the breakdown of superfluidity is initiated by the nucleation of vortex-antivortex pairs for an impenetrable obstacle and of Jones-Roberts solitons for a penetrable obstacle. Beyond superfluids of light, our results provide a general framework for the critical speed of two-dimensional binary nonlinear Schrödinger superflows, including Bose-Bose quantum mixtures.\u0000</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Ion yields and velocity map imaging of electron attachment-induced fragmentation of linear dialkyl carbonates: exploring dissociation patterns and mechanisms 离子产率和电子附着诱导的线性碳酸二烷基酯断裂的速度图成像:探索解离模式和机制
IF 1.5 4区 物理与天体物理
The European Physical Journal D Pub Date : 2026-05-30 DOI: 10.1140/epjd/s10053-026-01179-y
Giorgi Kharchilava, Jacob Finley, Dipayan Chakraborty, Ian Carmichael, Sylwia Ptasinska
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