We describe a hybrid pixel array detector (EMPAD - electron microscope detector) adapted for use in applications, especially as universal scanning transmission microscopy. The 128 x consists of 500 um thick silicon diode bump-bonded pixel-by-pixel to an application-specific integrated circuit (ASIC). in-pixel circuitry provides 1,000,000:1 dynamic range within single frame, allowing the direct beam be imaged while still maintaining sensitivity. A 1.1 kHz framing rate enables rapid data...

Quick Spin Flips Quantum computation holds the tantalizing promise of vastly improving efficiency traditional computers. Among many solid-state candidates for storing and manipulating quantum information, nitrogen vacancy centers in diamond are especially attractive because they can be used at room temperature stay operational milliseconds a time. To use this coherence time efficiently, it is important to achieve fast manipulation spins system. Fuchs et al. (p. 1520 , published online 19...

We investigate the distribution and temperature-dependent optical properties of sharp, zero-phonon emission from defect-based single photon sources in multilayer hexagonal boron nitride (h-BN) flakes. observe sharp lines optically active defects distributed across an energy range that exceeds 500 meV. Spectrally-resolved photon-correlation measurements verify emission, even when multiple are simultaneously excited within same h-BN flake. also present a detailed study linewidth, spectral...

As spin-based quantum technology evolves, the ability to manipulate spin with non-magnetic fields is critical - both for development of hybrid systems and compatibility conventional technology. Particularly useful examples are electric fields, optical mechanical lattice vibrations. The last these represents direct spin-phonon coupling, which has garnered fundamental interest as a potential mediator spin-spin interactions, but could also find applications in high-stability inertial sensing....

We report measurements of magnetic switching and steady-state precession driven by spin-polarized currents in nanoscale tunnel junctions with low-resistance, < 5 Ohm-micron-squared, barriers. The current densities required for are similar to values all-metallic spin-valve devices. In the junctions, spin-transfer-driven can occur at voltages that high enough quench magnetoresistance, demonstrating remains these voltages.

We demonstrate a technique to nanofabricate nitrogen vacancy (NV) centers in diamond based on broad-beam implantation through apertures electron beam lithography resist. This method enables high-throughput nanofabrication of single NV sub-100 nm length scales. Secondary ion mass spectroscopy (SIMS) measurements facilitate depth profiling the implanted provide three-dimensional characterization center spatial distribution. Measurements coherence with on-chip coplanar waveguides suggest...

The exceptional spin coherence of nitrogen-vacancy centers in diamond motivates their function emerging quantum technologies. Traditionally, the state individual is measured optically and destructively. We demonstrate dispersive, single-spin coupling to light for both nondestructive measurement, through Faraday effect, coherent manipulation, optical Stark effect. These interactions can enable exchange information between single spins light, facilitating control, entanglement that scalable...

We use single-spin resonant spectroscopy to study the spin structure in orbital excited state of a diamond nitrogen-vacancy (N-V) center at room temperature. The data show that excited-state levels have zero-field splitting is approximately half value ground levels, g factor similar value, and hyperfine 20x larger than state. In addition, width resonances reflects electronic lifetime also level can significantly differ between N-V centers, likely due effects local strain, which provides...

The localized spin triplet ground state of a nitrogen vacancy (NV) center in diamond can be used atomic-scale detection local magnetic fields. Here we present technique using ensembles these defects to image fields around structures. We extract the field vector by probing resonant transitions four fixed tetrahedral NV orientations. In combination with confocal microscopy techniques, construct two-dimensional vectors. Measurements are done external less than 50 G and under ambient conditions.

Nitrogen-vacancy (NV) centers in diamond have recently emerged as a unique platform for fundamental studies quantum information and nanoscience. The special properties of these impurity allow robust, room-temperature operation solid-state qubits enabled several remarkable demonstrations processing precision nanoscale sensing. This article reviews the recent advances magnetic optical manipulation NV center’s spin their importance prospective applications. We discuss how control individual can...

We investigate the polarization selection rules of sharp zero-phonon lines (ZPLs) from isolated defects in hexagonal boron nitride (HBN) and compare our findings with predictions a Huang-Rhys model involving two electronic states. Our survey, which spans spectral range ∼550-740 nm, reveals that, disagreement two-level model, absorption emission dipoles are often misaligned. relate dipole misalignment angle (Δθ) ZPL to its energy shift excitation (ΔE) find that Δθ≈0° when ΔE corresponds an...

Two-dimensional hexagonal boron nitride (h-BN) is a wide bandgap material which has promising mechanical and optical properties. Here we report the realization of an initial nucleation density h-BN <1 per mm2 using low-pressure chemical vapor deposition (CVD) on polycrystalline copper. This enabled wafer-scale CVD growth single-crystal monolayer with lateral size up to ∼300 μm, bilayer ∼60 trilayer ∼35 μm. Based large domain, sizes as-grown bi- grains are 2 orders magnitude larger than...

The recently discovered spin-active boron vacancy (V[Formula: see text]) defect center in hexagonal nitride (hBN) has high contrast optically-detected magnetic resonance (ODMR) at room-temperature, with a spin-triplet ground-state that shows promise as quantum sensor. Here we report temperature-dependent ODMR spectroscopy to probe spin within the orbital excited-state. Our experiments determine excited-state Hamiltonian, including room-temperature zero-field splitting of 2.1 GHz and g-factor...

We have fabricated nanoscale magnetic tunnel junctions (MTJs) with an additional fixed layer added above the free of a standard MTJ structure. This acts as second source spin-polarized electrons that, depending on relative alignment two layers, either augments or diminishes net spin torque exerted layer. The compound structure allows quantitative comparison from tunneling and passing through metallic spacer well analysis Joule self-heating effects. has significance for current-switched...

We report the determination of Auger recombination coefficient in strained and unstrained InGaAs/InGaAsP/InP separate-confinement multiple quantum-well laser structures. For a temperature 300 K well width 100 Å, we find an C=1.0×10−28 cm6 s−1, independent strain only weakly dependent on temperature. These properties indicate dominance phonon-assisted recombination. Our model calculations based six-band kp theory explain experimentally found dependency strain. The consequences performance are...

We report the determination of Auger recombination coefficients in bulk and quantum well InGaAs by time-resolved luminescence measurements. In coefficient is C=3.2×10−28 cm6/s has temperature dependence valence-band effect involving split-off valence band. 11 nm we find C=0.9×10−28 cm6/s, independent temperature. The decreases slightly with decreasing width.

Coherent control of the nitrogen-vacancy (NV) center in diamond’s triplet spin state has traditionally been accomplished with resonant ac magnetic fields. Here, we show that high-frequency stress splitting can also coherently NV spins. Because this mechanical drive is parity non-conserving, controlling spins enables direct access to magnetically forbidden |−1〉↔|+1〉 transition. Using a bulk-mode microresonator fabricated from single-crystal diamond, apply intense diamond substrate and observe...

A tabletop setup for imaging antiferromagnetic order shows how electron spin domains in a thin film of NiO respond to an external electric current, useful insight building fast computer memories.

Hexagonal boron nitride (hBN), a wide-bandgap 2D material, is rapidly emerging as promising candidate for quantum optics experiments. In this work, we demonstrate, to the best of our knowledge, first signature Rabi oscillations, time-domain analogue Mollow triplet, from resonantly driven hBN emitter. Resonant photoluminescence excitation measurements reveal that emitter undergoes strong spectral diffusion with time scale 37±25  ms, resulting in 0.6 GHz broadened linewidth at weak limit. We...

Abstract Organic radical polymers are promising cathode materials for next‐generation batteries because of their rapid charge transfer and high cycling stability. However, these organic polymer electrodes gradually dissolve in the electrolyte, resulting capacity fade. Several crosslinking methods have been developed to improve performance electrodes, but they either not compatible with carbon additives or compromise solution processability electrodes. A one‐step post‐synthetic,...

Abstract A cavity‐magnonic system composed of a superconducting microwave resonator coupled to magnon mode hosted by the organic‐based ferrimagnet vanadium tetracyanoethylene (V[TCNE] x ) is demonstrated. This work motivated challenge scalably integrating low‐damping magnetic with planar circuits. V[TCNE] has ultra‐low intrinsic damping, can be grown at low processing temperatures on arbitrary substrates, and patterned via electron beam lithography. The devices operate in strong coupling...

We measure the magnetic damping parameter a in thin film CoFeB and permalloy (Py) nanomagnets at room temperature using ferromagnetic resonance driven by microwave frequency spin-transfer torque. obtain $\alpha_{CoFeB} = 0.014 \pm 0.003$ $\alpha_{Py}=0.010 0.002$, values comparable to measurements for extended films, but significantly less than effective determined previously similar fits time-domain studies of large-angle excitations reversal. The greater found large amplitude nanomagnet...