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检索条件"丛书名=Springer Proceedings in Physics"

共 4830 条记录，以下是31-40 订阅

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NSI Effects on Entanglement of Formation in Three-Flavor Neutrino Oscillations

NSI Effects on Entanglement of Formation in Three-Flavor Neu...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Yadav, Bhavna Indian Inst Technol Jodhpur Jodhpur 342037 Rajasthan India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

Quantum correlation measures are extensively studied in neutrino systems as some measures show nonclassical features in neutrino oscillation. Entanglement is also a splendid measure to study in the neutrino system. Entanglement of formation is a fundamental concept in the realm of quantum physics, and it is a widely used measure for quantifying entanglement. We analyze the effects of non-standard interaction on the entanglement of formation in the context of various experimental setups for a three-flavor neutrino oscillation scenario. We find that the impact of NSI can be maximum in the DUNE, i.e., the long-baseline neutrino experiment.

关键词： EOF NSI Quantum correlation Standard model

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The Dark Hypercharge Symmetry

The Dark Hypercharge Symmetry

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Prajapati, Hemant Srivastava, Rahul Indian Inst Sci Educ & Res Bhopal Dept Phys Bypass Rd Bhopal India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

U(1) extension of the Standard Model (SM) is well motivated, where the charges of SM fermions are fixed by gauge anomaly cancellations and Yukawa interactions. While the literature extensively discusses anomaly cancellation solutions in which SM fermions are vector-like under new U(1)(X) symmetry, allowing the Yukawa structure to remain invariant, chiral solutions in which SM fermions are chiral under new symmetry are not well explored. In this work, we venture into these relatively unexplored chiral solutions. We presented a particularly intriguing chiral solution with the introduction of three right-handed fermions (RHFs). We termed this symmetry as Dark-Hyper Charge (DHC) Symmetry. This terminology stems from the resemblance of the U(1)(X) charges of the SM particles to hypercharge, with the term 'dark' referring to the relatively large charges of the RHFs. This implies that the branching fraction of Z' to these RHFs should be significantly high. The introduced RHFs could potentially serve as Dark Matter (DM) candidates. We will demonstrate in a model-independent manner using only the Z' interaction channel, that the lightest RHF, denoted as F-1, is a viable DM candidate, and it can meet all current DM constraints with a mass of M-F1 greater than or similar to 150 GeV.

关键词： Abelian gauge symmetry Chiral symmetry Dark Fermions Dark Matter

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Transfer Mechanism of a Passive Scalar in Grid Turbulence with Mean Scalar Gradient 10th

Transfer Mechanism of a Passive Scalar in Grid Turbulence wi...

引用

10th iTi conference on Turbulence

作者： Wang, M. Yurikusa, T. Iwano, K. Sakai, Y. Ito, Y. Nagoya Univ Grad Sch Engn Nagoya Aichi Japan Okayama Univ Sci Dept Mech Syst Engn Okayama Japan Nagoya Univ Global Engagement Ctr Nagoya Aichi Japan

ISBN: (纸本)9783031559303;9783031559242;9783031559235

We perform DNSs of grid turbulence with mean scalar gradient and conduct scale-by-scale analysis to reveal the interscale transfer of passive scalar. The scale-by-scale scalar (SBSS) equation, which can be deemed as an extended equation of the Karman-Howarth-Monin-Hill (KHMH) equation, is derived and employed in the DNS data to evaluate the interscale transfer between two points. The results reveal that the inverse cascade phenomenon of the scalar appears in the upstream regions. Further analysis reveals that the existence of fluid mass with an unmixed scalar plays an essential role in the inverse cascade phenomenon.

关键词： Turbulence

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Comparison of Thermo-Optic Phase Shifters in Imec's Silicon Photonics Platform 1

引用

25th European Conference on Integrated Optics (ECIO)

作者： Fang, Yuxi Deng, Hong Chen, Xiangfeng Cuma, Halil Nagarjun, K. P. Ferraro, Filippo Lepage, Guy De Heyn, Peter Bogaerts, Wim Univ Ghent Dept Informat Technol Photon Res Grp IMEC Ghent Belgium Imec VZW Kapeldreef 75 Heverlee Belgium

ISBN: (数字)9783031633782

ISBN: (纸本)9783031633805;9783031633782;9783031633775

Taking advantage of the high thermo-optic coefficient of silicon is an effectiveway to realize optical phase shifting in silicon photonic circuits. Based on the imec iSiPP200 silicon photonics platform, different types of integrated silicon photonic phase shifters are compared, including doped-silicon side heaters, diode-loaded heaters, doped waveguides, and metal top heaters. The effect of thermal insulation on phase shifter efficiency and bandwidth is discussed for different architectures with and without substrate undercut. By locally removing the silicon substrate underneath the heater, the efficiency of doped-silicon side heaters is improved by a factor of 2.7 for a pi phase shift.

关键词： Silicon Platforms Thermo-optic Phase Shifter Undercut Efficiency Bandwidth

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Flow Sensitivity Analysis for the Feedback Loop Phenomenon of Subsonic Jet Noise Generation 10th

Flow Sensitivity Analysis for the Feedback Loop Phenomenon o...

引用

10th iTi conference on Turbulence

作者： Morita, S. Yakeno, A. Bogey, C. Obayashi, S. Tohoku Univ Inst Fluid Sci 2-1-1 KatahiraAoba Ku Sendai Miyagi 9808579 Japan UMR 5509 Lab Mecan Fluides & Acoust F-69134 Ecully France

ISBN: (纸本)9783031559303;9783031559242;9783031559235

In this study, the feedback loop phenomena caused by upstream propagating waves (guided jet waves) in a Mach 0.9 free jet are investigated. A point source is placed at the end of the potential core of a three-dimensional free jet as a noise source in the jet and the sensitivity of the flow field is measured. The results show that the case St(D) = 0.47 has the highest sensitivity, which was consistent with the allowable frequency range of the guided jet wave. This result supports the idea that guided jet waves cause free shear layer instability waves.

关键词： Sensitivity analysis

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Porous Heterogeneous Sulfide Nickel/Nickel Iron Alloy Catalysts for Oxygen Evolution Reaction of Alkaline Water Electrolysis at High Current Density 1

引用

10th Hydrogen Technology Convention (WHTC)

作者： Bi, Songhu Geng, Zhen Jin, Liming Xue, Mingzhe Zhang, Cunman Tongji Univ Clean Energy Automot Engn Ctr Sch Automot Studies Shanghai 201804 Peoples R China

ISBN: (数字)9789819986316

ISBN: (纸本)9789819986330;9789819986316;9789819986309

Alkaline water electrolysis is the important pathway for the green hydrogen production, where oxygen evolution reaction (OER) is the rate-limiting step due to the sluggish reaction kinetics. Transition metal heterogeneous catalyst is the kind of important OER catalyst for alkaline water electrolysis due to its good performance, low price and environmental friendliness. In this work, the porous sulfide nickel@nickel iron alloy catalyst (i.e. NM/NS@Ni3Fe) is prepared by the designed high-temperature vulcanization and multi-step electrodeposition method. The NM/NS@Ni3Fe catalyst exhibits an outstanding OER performance in an alkaline environment, with a low potential of 1.53 V at high current density of 1000 mA cm(-2) and a low Tafel slope of 89 mV dec(-1). The excellent OER performance is attributed to the unique electronic structure of Ni3S2/Ni3Fe heterogeneous interface and the catalyst layer with porous structure. The results indicate that Ni3S2 provides good electronic conductivity and the low electronegativity S atoms increase the formation of oxygen vacancies, which effectively improves the OER performance. In addition, the hydrophilic and porous structure of the electrode facilitates bubbles release and electrolyte flow at high current density. It provides the guidance for the design of porous heterogeneous OER catalysts with good-performance.

关键词： Alkaline water electrolysis Oxygen evolution reaction Porous heterogeneous catalyst High current density

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Pound-Drever-Hall Laser Frequency Stabilization of Tunable 1.55 μm Monolithically Integrated Semiconductor Lasers Using an Integrated Phase Modulator 1

引用

25th European Conference on Integrated Optics (ECIO)

作者： Jones, Rachel Williams, Kevin Bente, Erwin Eindhoven Univ Technol NL-5612 AZ Eindhoven Netherlands

ISBN: (数字)9783031633782

ISBN: (纸本)9783031633805;9783031633782;9783031633775

Report on the advancement in the integration of the Pound-Drever-Hall (PDH) stabilization scheme on a single InP photonic integrated circuit by monolithically integrating a tunable laser and an electro-optic phase modulator (EOPM). A semi-insulating substrate allows a sufficiently reduced electrical crosstalk between the laser and the external EOPM to allow PDH stabilization. A novel implementation of the PDH lock is demonstrated, whereby an EOPM internal to the integrated lasing cavity is modulated. The frequency noise suppression of both implementations is measured and compared to those achieved with a bulk phase modulator. A 58 dB frequency noise suppression at 10-100 Hz is achieved.

关键词： Laser frequency stabilization monolithic integration narrow linewidth

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Dynamics via Attosecond Four-Wave Mixing 8th

Dynamics via Attosecond Four-Wave Mixing

引用

8th International Conference on Attosecond Science and Technology (ATTO)

作者： Gaynor, James D. Fidler, Ashley P. Lin, Yen-Cheng Puskar, Nicolette G. Neumark, Daniel M. Leone, Stephen R. Northwestern Univ Dept Chem Evanston IL 60208 USA Univ Calif Berkeley Dept Chem Berkeley CA 94720 USA Lawrence Berkeley Natl Lab Chem Sci Div Berkeley CA 94720 USA Princeton Univ Dept Chem Princeton NJ USA Univ Calif Berkeley Dept Phys Berkeley CA 94720 USA

ISBN: (纸本)9783031479403;9783031479380;9783031479373

Attosecond four-wave mixing spectroscopy is a relatively new technique for studying ultrafast dynamics of highly excited states with exquisite temporal precision and spectral resolution. The attosecond four-wave mixing technique, as described in this paper, uses non-collinear beam geometries of one attosecond pulse together with two optical pulses to obtain background-free, spatially isolated emission signals in the extreme ultraviolet range that directly resolve coherent dynamics in the time domain. This method is advantageous by avoiding the strong spectral modulations that often complicate the interpretation of collinear attosecond transient absorption studies while also enabling greater control over the spatial and temporal characteristics of each light-matter interaction used to probe the ultrafast processes. This paper describes a broad range of attosecond four-wave mixing experiments performed in gas phase atoms and molecules, and a recent extension into solids.

关键词： Attosecond Four wave mixing Atomic and molecular dynamics

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Polymer-Ge Hybrid Waveguide for Flexible Photonic Integration 1

引用

25th European Conference on Integrated Optics (ECIO)

作者： Liu, Jinyuan Ding, Zhenming Zhang, Ziyang Westlake Univ Sch Engn Lab Photon Integrat Hangzhou 310024 Peoples R China

ISBN: (数字)9783031633782

ISBN: (纸本)9783031633805;9783031633782;9783031633775

Amorphous germanium nanostrip is embedded in polymer to form a waveguide. Such waveguides only transmit TM-polarized light while imposing a strong absorption on the TE-polarized light. Furthermore, this absorption is shown to saturate upon femtosecond pulse excitation. This property is used to construct on-chip saturable absorber by depositing a Ge strip onto a polymer waveguide. Such hybrid waveguide is sandwiched between an InP reflective gain chip and a fiber Bragg grating to construct a mode-locked laser. Experiments have shown a pulse train with a 147-ps pulse width at 50.58-MHz repetition rate. The electronic signal-to-noise ratio is larger than 50 dB.

关键词： integrated optical waveguide nanometer-scale thin film heterogeneous integration mode-locked laser

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Ultrafast Tunable Photonic Integrated E-DBR Pockels Laser 1

引用

25th European Conference on Integrated Optics (ECIO)

作者： Siddharth, Anat Bianconi, Simone Qiu, Zheru Wang, Rui N. Bereyhi, Mohammad J. Kippenberg, Tobias J. Riemensberger, Johann Swiss Fed Inst Technol Lausanne EPFL CH-1015 Lausanne Switzerland Luxtelligence SA CH-1015 Lausanne Switzerland Norwegian Univ Sci & Technol N-7491 Trondheim Norway

ISBN: (数字)9783031633782

ISBN: (纸本)9783031633805;9783031633782;9783031633775

The hybrid integration of III-V gain media with low-loss photonic integrated circuits has advanced the performance of laser systems in terms of laser stability and coherence. The advent of lithium niobate on insulator (LNOI) photonics for self-injection locking and external cavities has allowed to increase in the frequency tuning rates of such lasers beyond the peta-hertz per second regime. Yet such lasers have up to now been difficult to operate and require complex photonic circuits and have only achieved low output powers. Here, we demonstrate a hybrid integrated frequency-agile laser based on an InP RSOA and an extended electro-optic Bragg waveguide reflector (E-DBR) manufactured with a wafer-scale lithium niobate-on-insulator process. The E-DBR laser can be tuned over 10 GHz with a tuning efficiency of more than 550 MHz/V with megahertz speed, and good linearity while featuring high optical output power of more than 10 mW and kilohertz linewidth.

关键词： Integrated photonics Lasers Electro-optic material

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