Abstract Graphene nanoribbons (GNRs)—narrow stripes of graphene—have emerged as promising building blocks for nanoelectronic devices. Recent advances in bottom-up synthesis have allowed production atomically well-defined armchair GNRs with different widths and doping. While all experimentally studied exhibited wide bandgaps, theory predicts that every third GNR (widths N =3 m +2, where is an integer) should be nearly metallic a very small bandgap. Here, we synthesize the narrowest possible...

The unique characteristics of the atmospheric propagation deep ultraviolet (UV) radiation make possible novel capability establishing non-line-of-sight (NLOS) optical communication links. Although NLOS UV communications (UVC) has been studied for decades, early work focused on use lasers and flash lamps as sources. Recent advances in device technology, including light-emitting diodes solar-blind filters, suggest that compact low-power systems may soon be feasible, and, a result, research...

In large part because of advancements in the design and fabrication UV LEDs, photodetectors, filters, significant research interest has recently been focused on non-line-of-sight communication systems. This in, for example, system performance prediction, can be greatly aided by accurate channel models that allow reproducibility results, thus facilitating fair consistent comparison different approaches. this paper, we provide a comprehensive derivation multiple-scattering Monte Carlo model,...

Hexagonal boron nitride (h-BN) is a prominent member in the growing family of two-dimensional materials with potential applications ranging from being an atomically smooth support for other to templating growth molecular layers. We have studied structure monolayer h-BN grown by chemical vapor deposition on Ir(111) low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) experiments state-of-the-art density functional theory (DFT) calculations. The lattice mismatch between...

This paper reports results from wireless chip-to-chip communication experiments. Sixteen bit words pass one chip to another in parallel without detectable error at 1.35 billion data items per second for a total rate of 21.6 Gigabits second. The experiment transmits pseudo random patterns between chips built 350-nm CMOS technology. Chips touch face-to-face communicate. same pseudorandom pattern is loaded onto both so that the receiving can check accuracy every communicated. Each channel...

We present circuits for driving long on-chip wires through a series capacitor. The capacitor improves delay signal pre-emphasis, offers reduced voltage swing on the wire low energy without second power supply, and reduces driven load, allowing smaller drivers. Sidewall parasitics used as improve process tracking, twisted interleaved differential reduce both coupled noise well Miller-doubled cross-capacitance. Multiple drivers sharing target allow simple FIR filters driver-side...

Using low-temperature scanning tunneling microscopy, we show that monolayer hexagonal boron nitride (h-BN) on Ir(111) acts as ultrathin insulating layer for organic molecules, while simultaneously templating their self-assembly. Tunneling spectroscopy experiments cobalt phthalocyanine (CoPC) reveal narrow molecular resonances and indicate the charge state of CoPC is periodically modulated by h-BN moiré superstructure. Molecules in second site-selective adsorption behavior, allowing synthesis...

Light-emitting diodes (LEDs) have the potential to replace traditional devices in a variety of lighting applications, offering possibility simultaneous modulation for communications. One method, color-shift keying (CSK), has been recently proposed specifically red/green/blue (RGB) LEDs. We examine design CSK signaling constellations an additive white Gaussian noise channel, incorporating common requirement that RGB LED outputs specific, possibly time-varying, perceived color. In particular,...

The electronic properties of graphene edges have been predicted to depend on their crystallographic orientation. so-called zigzag (ZZ) haven extensively explored theoretically and proposed for various applications. However, experimental study remains challenging due the difficulty in realizing clean ZZ without disorder, reconstructions, or presence chemical functional groups. Here, we propose ZZ-terminated, atomically sharp interfaces between hexagonal boron nitride (BN) as experimentally...

We have studied the adsorption and self-assembly of cobalt phthalocyanine (CoPc) on epitaxial graphene grown iridium (111) by scanning tunneling microscopy (STM), Auger electron spectroscopy, low-energy diffraction (LEED). CoPc deposited graphene/Ir(111) at room-temperature self-assembles into large, well-ordered domains with a nearly square unit cell. On basis observed LEED pattern STM images, detailed structure for overlayer is proposed. Despite corrugation moiré Ir(111), its hexagonal...

Abstract Topological modes in one- and two-dimensional systems have been proposed for numerous applications utilizing their exotic electronic responses. The 1D, zero-energy, topologically protected end can be realized structures implementing the Su–Schrieffer–Heeger (SSH) model. While edge SSH model are at exactly mid-gap energy, other paradigmatic 1D models such as trimer coupled dimer chains non-zero energy boundary states. However, these not an atomically tuneable system that would allow...

The predicted ubiquity of light-emitting diodes (LEDs) suggests great potential for dual-use systems with visible light communications (VLC) capabilities. One class LEDs employs multiple emitters at different wavelengths, making them appropriate applications requiring colored output and providing channels communication. We present a design framework optimizing the signaling constellation VLC employing an arbitrary number such LEDs, each emitters. In particular, by considering...

Abstract Spin-dependent scattering from magnetic impurities inside a superconductor gives rise to Yu-Shiba-Rusinov (YSR) states within the superconducting gap. They can be modeled by largely equivalent Kondo or Anderson impurity models. The role of and nonmagnetic properties in relation coupling substrate is still under debate. Here, we use scanning tunneling microscope make quantitative connection between energy YSR state impurity-substrate hybridization. We corroborate as key scale for...

Two chips communicate over a capacitively-coupled I/O link at 1.8Gb/s/ch. Channels are placed on 36mum pitch. 144 channels operate simultaneously for an aggregate bandwidth of 260Gb/s, or 430Gb/s/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in 0.18mum CMOS. Measured energy consumption is 3.0pJ/b and BER <10 xmlns:xlink="http://www.w3.org/1999/xlink">-15</sup> . Electronic alignment crosstalk rejection allow reliable practical implementation

As scanning tunneling microscopy is pushed towards fast local dynamics, a quantitative understanding of tunnel junctions under the influence ac driving signal required, especially at ultralow temperatures relevant to spin dynamics and correlated electron states. We subject superconductor-insulator-superconductor junction microwave from an antenna mounted in situ examine dc response contact this signal. Quasiparticle Josephson effect can be interpreted framework Tien-Gordon theory. The...

The continuous increase in storage densities and the desire for quantum memories computers push limits of magnetic characterization techniques. Ultimately, a tool that is capable coherently manipulating detecting individual spins needed. Scanning tunneling microscopy (STM) only technique unites prerequisites high spatial energy resolution, low temperature, fields to achieve this goal. Limitations available frequency range electron spin resonance STM (ESR-STM) mean many instruments operate...

This paper reports results from wireless chip to communication experiments. Sixteen bit words pass one another in parallel without detectable error at 1.35 billion data items per second for a total rate of 21.6 gigabits second. The experiment transmits pseudo random patterns between chips built 350 nm CMOS technology. Chips touch face-to-face communicate. same pattern is loaded onto both so that the receiving can check accuracy every communicated. Each channel consumes static power 3.6...

Capacitively-driven on-chip wires reduce both latency and energy compared to repeaters. A series coupling capacitance offers preemphasis lower wire delay, reduces the driven load, lowers voltage swing without a second power supply. 0.18 μm CMOS testchip shows 10.5times savings at 50mV full-swing repeated wires, 3times gain in bandwidth

The combination of organic linkers with metal atoms on top inorganic substrates offers promising perspectives for functional electronic and magnetic nanoscale devices. Typically, coordination bonds between electron-rich end groups transition-metal lead to the self-assembly metal-organic nanostructures, whose shape properties crucially depend type ligand. Here, we report site-selective bonding Co dichotomic dicyanoazobenzene molecule its carbonitrile diazo N-based moieties as possible...

In this study, the long-distance non-line-of-sight (NLOS) ultraviolet (UV) communication channel is characterised using experimental data and theoretical modelling. Experimental measurements of path loss pulse broadening effects at distances up to 4 km are reported analysed, comparisons between field test a Monte Carlo multiple-scattering model provides strong evidence for validity modelling approach. addition, probing turbulence also considered, but in case, authors find limited support...

Abstract The combination of several materials into heterostructures is a powerful method for controlling material properties. integration graphene (G) with hexagonal boron nitride (BN) in particular has been heralded as way to engineer the band structure and implement spin- valleytronics 2D materials. Despite recent efforts, fabrication methods well-defined G-BN structures on large scale are still lacking. We report new producing atomically an unprecedented length by exploiting interaction G...