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Consequences of a two-time relativistic Bohmian model

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Communications in Theoretical Physics 2024年第7期76卷 63-73页

作者： Giuseppe Raguni Departamento de fisica Universidad de MurciaE-30071 MurciaSpain

Effects of a Bohmian type quantum-relativistic theory are *** model is obtained by introducing a new and independent time parameter whose relative motions are not directly observable and cause quantum uncertainties of the physical *** the usual de Broglie-Bohm theories,the Quantum Potential does not directly affect the observable motion,but determines the one that is relative to the new time *** turns out that the Zitterbewegung of a free particle,of which a more general law is obtained,is the key example of these hidden motions and,through it,it seems possible to give physical reality to the Feynman's paths.A relativistic revision of the uncertainty principle is also derived from the theory.

关键词： Quantum Mechanics Foundations de Broglie-Bohm theory Zitterbewegung uncertainty principle verification extra dimensions

AC-current-induced magnetization switching in amorphous microwires

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Frontiers of physics 2018年第2期13卷 213-223页

作者： V. Zhukova J. M. Blanco A. Chizhik M. ipatov A. Zhukov dpto. fisica aplicada i EUPDS UPV/EHU Plaza Europa 1 San Sebastidn 20018 Spain dpto. fisica de Materiales Facultad de Qulmica UPV/EHU 1072 20080 San Sebastidn Spain iKERBASQUE Basque Foundation for Science 58011 Bilbao Spain

We studied the influence of AC current flowing through microwires, on magnetization dynamics. We used a previously developed Sixtus-Tonks modified setup to evaluate the domain wall （DW） velocity within the microwire. However, instead of a magnetizing solenoid, we used a current flowing through the microwire. We observed that the AC current flowing through the annealed Co-rich microwire leads to remagnetization by fast domain wall propagation. The estimated DW velocity was approximately 4.5 km/s, which is similar to and even higher than that reported for the magnetic-field-driven domain wall propagation in Fe- and Co-rich microwires. We measured the DW velocity under tensile stress, and found that the DW velocity decreases under applied stress. An observed DW propagation induced by the current flowing through the microwire is explained considering the influence of an Oersted magnetic field on the outer domain shell. This field has a circular easy magnetization direction and magnetostatic interaction between the outer circumferentially magnetized shell and the inner axially magnetized core.

关键词： domain wall propagation magnetic microwire amorphous material magnetoelasticanisotropy

Observing the collapse of super-Bloch oscillations in strong-driving photonic temporal lattices

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Advanced Photonics 2024年第4期6卷 14-24页

作者： Xinyuan Hu Shulin Wang Chengzhi Qin Chenyu Liu Lange Zhao Yinglan Li Han Ye Weiwei Liu Stefano Longhi Peixiang Lu Bing Wang Huazhong University of Science and Technology School of Physics Wuhan National Laboratory for Optoelectronics Wuhan institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition Politecnico di Milano Dipartimento di Fisica iFiSC (UiB-CSiC) Instituto de Fisica Interdisciplinary Sistemas Complejos

Super-Bloch oscillations(SBOs) are amplified versions of direct current(dc)-driving Bloch oscillations realized under the detuned dc-and alternating current(ac)-driving electric fields. A unique feature of SBOs is the coherent oscillation inhibition via the ac-driving renormalization effect, which is dubbed as the collapse of SBOs. However, previous experimental studies on SBOs have only been limited to the weak ac-driving regime, and the collapse of SBOs has not been observed. Here, by harnessing a synthetic temporal lattice in fiber-loop systems, we push the ac-field into a strong-driving regime and observe the collapse of SBOs, which manifests as the oscillation-trajectory localization at specific ac-driving amplitudes and oscillation-direction flip by crossing collapse points. By adopting arbitrary-wave ac-driving fields, we also realize generalized SBOs with engineered collapse conditions. Finally, we exploit the oscillation-direction flip features to design tunable temporal beam routers and splitters. We initiate and demonstrate the collapse of SBOs, which may feature applications in coherent wave localization control for optical communications and signal processing.

关键词： Electric fields Optical modulators Phase modulation Bessel functions Optical coherence Polarization Pulse signals Solids Physical coherence Signal processing

Classification of Some Nilpotent Class of Leibniz Superalgebras

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Acta Mathematica Sinica,English Series 2010年第5期26卷 799-816页

作者： Luisa M.CAMACHO José R.GóMEZ Rosa M.NAVARRO Bakhrom A.OMiROV dpto. Matemática aplicada i Universidad de Sevilla dpto. de Matemáticas Universidad de Extremadura institute of Mathemátics and information Technologues Uzbekistan Academy of Science

The aim of this work is to present the description of Leibniz superalgebras up to isomorphism with characteristic sequence （n｜m - 1, 1） and nilindex n ＋ m.

关键词： Lie superalgebras Leibniz superalgebras nilindex charasteristic sequence

All-electron basis sets for H to Xe specific for ZORA calculations:Applications in atoms and molecules

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Chinese Physics B 2024年第8期33卷 238-246页

作者： C.S.Gomes F.E.Jorge A.Canal Neto Departamento de fisica Universidade Federal do Espirito Santo29075-910 VitoriaESBrazil Departamento de fisica Instituto de Ciencias Exatas e BiologicasUniversidade Federal de Ouro Preto Campus Universitario Morro do Cruzeiro35402-136 Ouro PretoMGBrazil

A segmented basis set of quadruple zeta valence quality plus polarization functions(QZP)for H through Xe was developed to be used in conjunction with the ZORA *** set was augmented with diffuse functions to describe electrons farther away from the nuclei *** the ZORA-CCSD(T)/QZP-ZORA theoretical model,atomic ionization energies and bond lengths,harmonic vibrational frequencies,and atomization energies of some molecules were *** addition of core-valence corrections has been shown to improve the agreement between theoretical and experimental results for molecular *** atomization energies,a similar observation emerges when considering spin-orbit *** the augmented QZP-ZORA set,static mean dipole polarizabilities of a set of atoms were calculated and compared with previously published recommended and experimental *** evaluations of the ZORA and Douglas–Kroll–Hess Hamiltonians were made for each property studied.

关键词： QZP-ZORA and AQZP-ZORA basis sets elements from H to Xe CCSD(T)method atomic and molecular properties

Verdier quotients of homotopy categories of rings and Gorenstein-projective precovers

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Science China Mathematics 2024年

作者： Manuel Cortés-izurdiaga Departamento de Matemática aplicada Universidad de Málaga

Let R be a ring, Proj be the class of all the projective right R-modules, K be the full subcategory of the homotopy category K(Proj) whose class of objects consists of all the totally acyclic complexes, and MorK be the class of all the morphisms in K(Proj) whose cones belong to K. We prove that if K(Proj) has enough MorK-injective objects, then the Verdier quotient K(Proj)/K has small Hom-sets, and this last condition implies the existence of Gorenstein-projective precovers in Mod-R and of totally acyclic precovers in C(Mod-R).

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Emergingγ-soft-like spectrum in^(196)Pt in the SU3-iBM(Ⅰ)

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Chinese Physics C 2024年第9期48卷 150-163页

作者： Tao Wang Bing-Cheng He Chun-Xiao Zhou Dong-Kang Li Lorenzo Fortunato College of Physics Tonghua Normal UniversityTonghua 134000China Physics Division Argonne National LaboratoryLemontIllinois 60439USA College of Mathematics and Physics Science Hunan University of Arts and ScienceChangde 415000China Dipartimento di fisica e Astronomia"G.Galilei"-Universitàdi Padova via Marzolo 8I-35131 PadovaItaly iNFN-Sez.di Padova via Marzolo 8I-35131 PadovaItaly

Recently,studies have argued that a spherical-like spectrum emerges in the SU3-iBM,thus creating new approaches to understanding y-softness in realistic *** a previous study,γ-softness with degeneracy of the ground and quasi-y bands was *** this paper,another special point connected to the middle degenerate point is *** is found to be related to the properties of^(196)*** emergentγ-softness is also shown to be important for understanding the prolate-oblate asymmetric shape phase *** low-lying spectra,B(E2)values,and quadrupole moments in^(196)Pt are discussed,and we show that the new model can account for several observed *** is the first part of the discussion on theγ-soft-like spectrum of^(196)Pt.

关键词： SU3-iBM ^(196)Pt γ-soft-like spectrum

Ultra-highly sensitive dual gases detection based on photoacoustic spectroscopy by exploiting a long-wave,high-power,wide-tunable,singlelongitudinal-mode solid-state laser

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Light(Science & Applications) 2024年第5期13卷 941-956页

作者： Shunda Qiao Ying He Haiyue Sun Pietro Patimisco Angelo Sampaolo Vincenzo Spagnolo Yufei Ma National Key Laboratory of Laser Spatial information Harbin Institute of TechnologyHarbinChina PolySense Lab Dipartimento Interateneo di FisicaUniversity and Politecnico of BariVia AmendolaBariItaly

Photoacoustic spectroscopy(PAS)as a highly sensitive and selective trace gas detection technique has extremely broad application in many ***,the laser sources currently used in PAS limit the sensing *** to diode laser and quantum cascade laser,the solid-state laser has the merits of high optical power,excellent beam quality,and wide tuning *** we present a long-wave,high-power,wide-tunable,singlelongitudinal-mode solid-state laser used as light source in a PAS sensor for trace gas *** self-built solid-state laser had an emission wavelength of~2μm with Tm:YAP crystal as the gain material,with an excellent wavelength and optical power stability as well as a high beam *** wide wavelength tuning range of 9.44 nm covers the absorption spectra of water and ammonia,with a maximum optical power of~130 mW,allowing dual gas detection with a single laser *** solid-state laser was used as light source in three different photoacoustic detection techniques:standard PAS with microphone,and external-and intra-cavity quartz-enhanced photoacoustic spectroscopy(QEPAS),proving that solid-state laser is an attractive excitation source in photoacoustic spectroscopy.

关键词： power tunable tuning

Engineering magnetic nanostructures with inverse hysteresis loops

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Nano Research 2016年第8期9卷 2347-2353页

作者： Beatriz Mora Nastassia Soriano Carolina Redondo Alberto Arteche David Navas Rafael Morales dpto. de Quimica-fisica Universidad del Pais Vasco UPWEHU 48940 Leioa Spain iFiMUP-iN and Dept. fisica e Astronomia Universidade do Porto 4169007 Porto Portugal dpto. de Qulmica-Ffsica & BCMaterials Universidad del Pals Vasco UPV/EHU 48940 Leioa Spain iKERBASQUE Basque Foundation for Science 48011 Bilbao Spain

Top-down lithography techniques allow the fabrication of nanostructured elements with novel spin configurations, which provide a new route to engineer and manipulate the magnetic response of sensors and electronic devices and understand the role of fundamental interactions in materials science. in this study, shallow nanostructure-patterned thin films were designed to present inverse magnetization curves, i.e., an anomalous magnetic mechanism characterized by a negative coercivity and negative remanence. This procedure involved a method for manipulating the spin configuration that yielded a negative coercivity after the patterning of a single material layer. Patterned NiFe thin films with trench depths between 15%-25% of the total film thickness exhibited inverse hysteresis loops for a wide angular range of the applied field and the trench axis. A model based on two exchange-coupled subsystems accounts for the experimental results and thus predicts the conditions for the appearance of this magnetic behavior. The findings of the study not only advance our understanding of patterning effects and confined magnetic systems but also enable the local design and control of the magnetic response of thin materials with potential use in sensor engineering.

关键词： magnetic nanostructures magnetic patterning effects inverted loops negative coercivity negative remanence