204 research outputs found
Entangling ferrimagnetic magnons with an atomic ensemble via opto-magnomechanics
We show how to prepare macroscopic entanglement between an atomic ensemble
and a large number of magnons in a ferrimagnetic YIG crystal. Specifically, we
adopt an opto-magnomechanical configuration where the magnetostriction-induced
magnomechanical displacement couples to an optical cavity via radiation
pressure, and the latter further couples to an ensemble of two-level atoms that
are placed inside the cavity. We show that by properly driving the cavity and
magnon modes, optomechanical entanglement is created which is further
distributed to the atomic and magnonic systems, yielding stationary
entanglement between atoms and magnons. The atom-magnon entanglement is a
result of the combined effect of opto- and magnomechanical cooling and
optomechanical parametric down-conversion interactions. A competition mechanism
between two mechanical cooling channels is revealed. We further show that
genuine tripartite entanglement of three massive subsystems, i.e., atoms,
magnons and phonons, can also be achieved in the same system. Our results
indicate that the hybrid opto-magnomechanical system may become a promising
system for preparing macroscopic quantum states involving magnons, photons,
phonons and atoms
Entangling Two Bosonic Polaritons via Dispersive Coupling with a Third Mode
We provide a general mechanism of entangling two strongly-coupled bosonic
systems that form two hybridized (polariton) modes. This is realized by
dispersively coupling with a third bosonic mode. Stationary entanglement is
achieved when the two hybridized modes are respectively resonant with the
sidebands of the drive field scattered by the third mode and when the weights
of the two bosonic modes in the two polaritons are appropriately chosen. The
entanglement is robust against dissipations of the system and bath temperature.
The entanglement theory is quite general and applicable to a variety of bosonic
systems, such as cavity magnomechanical and exciton-photon-phonon systems
Effects of OMMT on the aging behaviors of halogen-antimony flame-retarded LGFPA6 composites: Flammability and thermal degradation kinetics
After a long-term thermo-oxidative exposure, compared to the long-glass-fiber reinforced polyamide 6 composite containing halogen-antimony flame retardants (FR/LGFPA6), substitution of a certain content of flame retardants with organo-modified montmorillonite (OMMT) was found to positively affect the FR/LGFPA6 composite in some cases (i.e. flammability and thermal degradation kinetics). The aged OMMT/FR/LGFPA6 composite not only was less flammable but also behaved better in the formation of char residues. All the calculated apparent activation energy obtained by the methods of Friedman, Flynn-Wall-Ozawa and Coats- Redfern in a dynamic measurement showed an obvious increase for the OMMT/FR/LGFPA6 composite after aging, a theoretical evidence for its improved flame retardancy
Paradoxical phenomena of bullous pemphigoid induced and treated by identical biologics
ObjectiveThis study aimed to investigate the clinical features of biologics-induced bullous pemphigoid (BP) and the therapeutic effects of those agents for BP, exploring the underlying pathophysiological mechanisms.MethodsWe searched PubMed, Web of Science, and Elsevier for studies involving pemphigoid patients treated with or induced by identical biologics published in English from January 2009 to April 2022.ResultsSeventeen cases of drug-induced BP associated with anti-tumor necrosis factor (aTNF)-α therapies, one with interleukin (IL)-17 inhibitors, and seven with IL-12/IL-23 or IL-23 inhibitors were enrolled. Time to cutaneous toxicity varied among different types of agents, and the characteristics of clinical examinations were similar to idiopathic BP. Discontinuation of the culprit drugs and initiation of topical or systemic corticosteroids were adequate in most cases. Several monoclonal antibodies above have also been reported for the treatment of refractory or recurrent BP, especially concurrent with psoriasis.ConclusionBiologics for immune-related diseases, including TNF-α, IL-17, and IL-12/IL-23 or IL-23 inhibitors, can both induce and treat BP, which might be associated with a helper T cells Th1/Th2 imbalance, complicated inflammatory networks, and a specific individual microenvironment, suggestive of a new perspective on the therapeutic algorithms of BP. There have been numerous reports about biologics inducing or treating BP. We have taken note of this phenomenon and focused on biologics with both pathogenetic and therapeutic effects on BP. Our review summarized the clinical characteristics of associated cases, trying to figure out the underlying mechanisms of this paradoxical phenomenon and to provide an integrated perspective and new therapeutic alternatives for BP
Cavity magnomechanics: from classical to quantum
Hybrid quantum systems based on magnons in magnetic materials have made
significant progress in the past decade. They are built based on the couplings
of magnons with microwave photons, optical photons, vibration phonons, and
superconducting qubits. In particular, the interactions among magnons,
microwave cavity photons, and vibration phonons form the system of cavity
magnomechanics (CMM), which lies in the interdisciplinary field of cavity QED,
magnonics, quantum optics, and quantum information. Here, we review the
experimental and theoretical progress of this emerging field. We first
introduce the underlying theories of the magnomechanical coupling, and then
some representative classical phenomena that have been experimentally observed,
including magnomechanically induced transparency, magnomechanical dynamical
backactions, magnon-phonon cross-Kerr nonlinearity, etc. We also discuss a
number of theoretical proposals, which show the potential of the CMM system for
preparing different kinds of quantum states of magnons, phonons, and photons,
and hybrid systems combining magnomechanics and optomechanics and relevant
quantum protocols based on them. Finally, we summarize this review and provide
an outlook for the future research directions in this field.Comment: Review article, 42 pages, 16 figure
Nuclear Stopping as A Probe to In-medium Nucleon-nucleon Cross Section in Intermediate Energy Heavy Ion Collisions
Using an isospin-dependent quantum molecular dynamics, nuclear stopping in
intermediate heavy ion collisions has been studied. The calculation has been
done for colliding systems with different neutron-proton ratios in beam energy
ranging from 15MeV/u to 150MeV/u. It is found that, in the energy region from
above Fermi energy to 150MeV/u, nuclear stopping is very sensitive to the
isospin dependence of in-medium nucleon-nucleon cross section, but insensitive
to symmetry potential. From this investigation, we propose that nuclear
stopping can be used as a new probe to extract the information on the isospin
dependence of in-medium nucleon-nucleon cross section in intermediate energy
heavy ion collisions
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