Defects in solids are unavoidable and can create complex electronic states that significantly influence the electrical optical properties of semiconductors. With rapid progress integration 2D semiconductors practical devices, it is imperative to understand characterize defects this class materials. Here, we examine response defect filling emission using deep level transient spectroscopy (DLTS) reveal their hybridization a monolayer MOCVD-grown material deposited on CMOS-compatible...

We unveil the nature of structural disorder in bottom-up zigzag graphene nanoribbons along with its effect on magnetism and electronic transport basis scanning probe microscopies first-principles calculations. find that edge-missing m-xylene units emerging during cyclodehydrogenation step on-surface synthesis are most common point defects. These "bite" defects act as spin-1 paramagnetic centers, severely disrupt conductance spectrum around band extrema, give rise to spin-polarized charge...

Abstract Two-dimensional flat-band systems have recently attracted considerable interest due to the rich physics unveiled by emergent phenomena and correlated electronic states at van Hove singularities. However, difficulties in electrically detecting position field-effect structures are slowing down investigation of their properties. In this work, we use indium selenide (InSe) as a system singularity valence-band edge few-layer form material without requirement twist angle. We investigate...

On-surface synthesis has recently emerged as an effective route towards the atomically precise fabrication of graphene nanoribbons controlled topologies and widths. However, whether to which degree structural disorder occurs in resulting samples is a crucial issue for prospective applications that remains be explored. Here, we experimentally identify missing benzene rings at edges, name "bite" defects, most abundant type armchair synthesized by bottom-up approach. First, address their...

Applying elastic deformation can tune a material's physical properties locally and reversibly. Spatially modulated lattice create bandgap gradient, favoring photogenerated charge separation collection in optoelectronic devices. These advantages are hindered by the maximum strain that material withstand before breaking. Nanomaterials derived exfoliating transition metal dichalcogenides (TMDs) an ideal playground for deformation, as they sustain large strains, up to few percent. However,...

We investigated the effect of a liquid's electrical conductivity (EC) on physical characteristics discharges in liquids with gaseous bubbles. Argon gas was supplied into liquid to form an array bubbles between two electrodes (a pin-to-hollow electrode setup). Methanol and water were considered as base liquids, representing low high dielectric permittivity (e) respectively, while potassium chloride (KCl) added control EC liquids. When increasing we found that discharge probability reduced by...

The success of all-graphene electronics is severely hindered by the challenging realization and subsequent integration semiconducting channels metallic contacts. Here, we comprehensively investigate electronic transport across width-modulated heterojunctions consisting a graphene quantum dot varying lengths widths embedded in pair armchair-edged nanoribbons, kind recently fabricated via on-surface synthesis. We show that presence enables opening width-dependent gap, thereby yielding built-in...

Controlling the size of single-digit pores, such as those in graphene, with an Å resolution has been challenging due to limited understanding pore evolution at atomic scale. The controlled oxidation graphene led Å-scale pores; however, obtaining a fine control over from precursor (i.e., oxygen cluster) is very attractive. Herein, we introduce novel "control knob" for gasifying clusters form pores. We show that cluster evolves into core/shell structure composed epoxy group surrounding ether...

The low-energy electronic structure of nanographenes can be tuned through zero-energy π-electron states, typically referred to as zero-modes. Customizable and magnetic structures have been engineered by coupling zero-modes exchange hybridization interactions. Manipulation the energy such however, has not yet received significant attention. We find that attaching a five-membered ring zigzag edge hosting zero-mode perturbs mode turns it into an off-zero mode: localized state with distinctive...

Interactions among a collection of particles generate many-body effects in solids that result striking modifications material properties. The heavy carrier mass yields strong interactions and gate control density over wide range makes two-dimensional semiconductors an exciting playground to explore physics. family III-VI metal monochalcogenides emerges as new platform for this purpose because its excellent optical properties the flat valence band dispersion. In work, we present complete...

Carbon nano-onions are a class of nanomaterials that can exhibit long electron spin relaxation times at room temperature and thus hold promise as potential building blocks for spintronics quantum information processing devices. Despite first being synthesized 30 years ago, there exists gap in understanding electronic magnetic properties these nanostructures. Here we investigate the origin metallic-like behavior has been observed experimentally disordered nano-onions. Employing density...

Abstract We theoretically investigate the electron transport in armchair and zigzag graphene nanoribbons (GNRs) chemically functionalized with p -polyphenyl polyacene groups of increasing length. Our nearest-neighbor tight-binding calculations indicate that, depending on whether number aromatic rings functional group is even or odd, resulting conductance at energies matching energy levels corresponding isolated molecule either unaffected reduced by exactly one quantum as compared to pristine...

Abstract While bottom-up synthesis allows for precise control over the properties of graphene nanoribbons (GNRs), use certain precursor molecules can result in edge defects, such as missing benzene rings that resemble a ‘bite’. We investigate adverse effect ‘bite’ defects on electronic transport three chevron-type GNRs and discover extent scattering is governed by different defect positions. Applying concepts learned single GNRs, we engineer two nanostructures to construct prototypical...

Graphene nanoribbons (GNRs) produced by means of bottom-up chemical self-assembly are considered promising candidates for the next-generation nanoelectronic devices. We address electronic transport properties angled two-terminal GNR junctions, which inevitable in interconnects graphene-based integrated circuits. construct a library over 400000 distinct configurations 60$^\circ$ and 120$^\circ$ junctions connecting armchair GNRs different widths. Numerical calculations combining tight-binding...

Applying elastic deformation can tune a material physical properties locally and reversibly. Spatially modulated lattice create bandgap gradient, favouring photo-generated charge separation collection in optoelectronic devices. These advantages are hindered by the maximum strain that withstand before breaking. Nanomaterials derived exfoliating transition metal dichalcogenides TMDs an ideal playground for deformation, as they sustain large strains, up to few percent. However, exfoliable with...

Interactions among a collection of particles generate many-body effects in solids resulting striking modifications material properties. The heavy carrier mass that yields strong interactions and gate control density over wide range, make two-dimensional semiconductors an exciting playground to explore physics. family III-VI metal monochalcogenides emerges as new platform for this purpose due its excellent optical properties the flat valence band dispersion with Mexican-hat-like inversion. In...

Two-dimensional flat-band systems have recently attracted considerable interest due to the rich physics unveiled by emergent phenomena and correlated electronic states at van Hove singularities. However, difficulties in electrically detecting flat band position field-effect structures are slowing down investigation of their properties. In this work, we employ Indium Selenide (InSe) as a system singularity valence edge few-layer form material without requirement twist angle. We investigate...