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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Junction-free microwave two-mode radiation from a kinetic inductance nanowire
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Disentangling superconductor and dielectric microwave losses in submicrometer Nb / Si O 2 interconnects using a multimode microstrip resonator
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Probing the weak gravity conjecture in the cosmic microwave background
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Detecting high-frequency gravitational waves with microwave cavities
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Maximal gravitational wave signal from asteroid-mass primordial black hole mergers at resonant microwave cavities
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Search for 70 μ eV Dark Photon Dark Matter with a Dielectrically Loaded Multiwavelength Microwave Cavity
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Microwave photon number resolving detector using the topological surface state of superconducting cadmium arsenide
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Ultra-high-precision detection of single microwave photons based on a hybrid system between a Majorana zero mode and a quantum dot
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Trapping Electrons in a Room-Temperature Microwave Paul Trap
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Microwave Spin Control of a Tin-Vacancy Qubit in Diamond
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Robustness and Eventual Slow Decay of Bound States of Interacting Microwave Photons in the Google Quantum AI Experiment
Integrable models are characterized by the existence of stable excitations that can propagate indefinitely without decaying. This includes multimagnon bound states in the celebrated 𝑋𝑋𝑍 spin-chain model and its integrable Floquet counterpart. A recent Google Quantum AI experiment [A. Morvan et al., Nature 612, 240 (2022)] realizing the Floquet model has demonstrated the persistence of such collective excitations even when the integrability is broken: this observation is at odds with the expectation of ergodic dynamics in generic nonintegrable systems. Here, we study the spectrum of the model realized in the experiment using exact diagonalization and physical arguments. We find that isolated bands corresponding to the descendants of the exact bound states of the integrable model are clearly observable in the spectrum for a large range of system sizes. However, our numerical analysis of the localization properties of the eigenstates suggests that the bound states become unstable in the thermodynamic limit. A perturbative estimate of the decay rate agrees with the prediction of an eventual instability for large system sizes.
Generating Information-Diverse Microwave Speckle Patterns Inside a Room at a Single Frequency With a Dynamic Metasurface Aperture
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Multimaterial Aerosol Jet Printed Magnetic Nanocomposites for Microwave Circuits
Here this article demonstrates the process and characterization of additively manufactured polymer-matrix magnetic nanocomposites. These nanocomposites are composed of nickel-zinc ferrite (Ni 0.5 Zn 0.5 Fe 2 O 4 ) nanoparticles in a polyimide matrix. These materials are printed using multimaterial aerosol jet printing where aerosols of nickel-zinc ferrite and polyimide inks are mixed in place to fabricate structures with nonunity relative permeability. To characterize these materials, we use energy-dispersive X-ray spectroscopy to estimate the content of ferrite in the composite, fitted simulation models, and ring resonator measurements to estimate the permeability. In fully aerosol jet printed 1-mm 2 inductors, we demonstrate an increase in inductance density of 40% in a 4.5-turn microstrip spiral inductor using this printed composite. These fully printed inductors demonstrate an inductance density of 4.2-nH/mm 2 . EDS analysis shows films with 18 wt.% Ni 0.5 Zn 0.5 Fe 2 O 4 . Finally, we show microstrip transmission lines on printed composite compared to the same on polyimide subjected to a dc magnetic bias, displaying a magnetic resonance behavior.
An Improved UWB Microwave Radar for Very Long-Range Measurements of Snow Cover
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