A5090774104- Molecular Junctions and Nanostructures
- Graphene research and applications
- Quantum and electron transport phenomena
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Force Microscopy Techniques and Applications
- Topological Materials and Phenomena
- Mechanical and Optical Resonators
- Natural Language Processing Techniques
- Supercapacitor Materials and Fabrication
- Quantum-Dot Cellular Automata
- Carbon Nanotubes in Composites
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Text Readability and Simplification
- Topic Modeling
- Magnetism in coordination complexes
- Gas Sensing Nanomaterials and Sensors
- Advanced Chemical Physics Studies
- Advanced Text Analysis Techniques
- Noise Effects and Management
- Hate Speech and Cyberbullying Detection
- Aerodynamics and Acoustics in Jet Flows
- 2D Materials and Applications
- Advanced Memory and Neural Computing
CIC nanoGUNE
2019-2024
University of Mannheim
2023
Forschungszentrum Jülich
2018-2021
Technical University of Munich
2020
UNSW Sydney
2020
University of Technology Sydney
2020
Westsächsische Hochschule Zwickau
2020
Jülich Aachen Research Alliance
2018-2019
Graphene can develop large magnetic moments in custom-crafted open-shell nanostructures such as triangulene, a triangular piece of graphene with zigzag edges. Current methods engineering nanosystems on surfaces succeeded producing atomically precise structures, but demonstration their net spin remains elusive to date. Here, we fabricate triangulenelike systems and demonstrate that they possess S=1 ground state. Scanning tunneling spectroscopy identifies the fingerprint an underscreened Kondo...
Nitrogen heteroatom doping into a triangulene molecule allows tuning its magnetic state. However, the synthesis of nitrogen-doped (aza-triangulene) has been challenging. Herein, we report successful aza-triangulene on Au(111) and Ag(111) surfaces, along with their characterizations by scanning tunneling microscopy spectroscopy in combination density functional theory (DFT) calculations. Aza-triangulenes were obtained reducing ketone-substituted precursors. Exposure to atomic hydrogen...
Triangulene nanographenes are open-shell molecules with predicted high spin state due to the frustration of their conjugated network. Their long-sought synthesis became recently possible over a metal surface. Here, we present macrocycle formed by six [3]triangulenes, which was obtained combining solution dimethylphenyl-anthracene cyclic hexamer and on-surface cyclodehydrogenation this precursor gold substrate. The resulting triangulene nanostar exhibits collective generated interaction its...
Graphene nanoribbons (GNRs), low-dimensional platforms for carbon-based electronics, show the promising perspective to also incorporate spin polarization in their conjugated electron system. However, magnetism GNRs is generally associated with localized states around zigzag edges, difficult fabricate and high reactivity. Here we demonstrate that can be induced away from physical GNR edges through atomically precise engineering topological defects its interior. A pair of substitutional boron...
Noise mitigation of stage machinery can be quite demanding and requires innovative solutions. In this work, an acoustic metamaterial capsule is proposed to reduce the noise emission several drive trains, while still allowing ventilation required for cooling. The consists c-shape meta-atoms, which have a simple structure that facilitates manufacturing. Two different capsules are designed, simulated, manufactured, experimentally validated utilize ultra-sparse air-permeable reflective...
We report on the fabrication and transport characterization of atomically precise single-molecule devices consisting a magnetic porphyrin covalently wired by graphene nanoribbon electrodes. The tip scanning tunneling microscope was utilized to contact end GNR–porphyrin–GNR hybrid system create molecular bridge between sample for measurements. Electrons through suspended heterostructure excited spin multiplet porphyrin. detachment certain centers from surface shifted their spin-carrying...
Metal halides are a class of layered materials with promising electronic and magnetic properties persisting down to the two-dimensional limit. While most recent studies focused on trihalide components this family, rather unexplored metal dihalides also van der Waals systems distinctive properties. Here we show that dihalide NiBr
Spin-hosting graphene nanostructures are promising metal-free systems for elementary quantum spintronic devices. Conventionally, spins protected from quenching by electronic bandgaps, which also hinder access to their state. Here, we present a narrow nanoribbon substitutionally doped with boron heteroatoms that combines metallic character the presence of localized spin 1/2 states in its interior. The ribbon was fabricated on-surface synthesis on Au(111) substrate. Transport measurements...
Triangulenes are a class of open-shell triangular graphene flakes with total spin increasing their size. In the last years, on-surface-synthesis strategies have permitted fabricating and engineering triangulenes various sizes structures atomic precision. However, direct proof size remains elusive. this work, we report combined in-solution on-surface synthesis large nitrogen-doped triangulene (aza-[5]-triangulene) on Au(111) surface, detection its high-spin ground state. Bond-resolved...
Abstract The number of scientific publications nowadays is rapidly increasing, causing information overload for researchers and making it hard scholars to keep up date with current trends lines work. Recent work has tried address this problem by developing methods automated summarization in the scholarly domain, but concentrated so far only on monolingual settings, primarily English. In paper, we consequently explore how state-of-the-art neural abstract models based a multilingual...
Controlling the spin of metal atoms embedded in molecular systems is a key step toward realization electronics and spintronics. Many efforts have been devoted to explore influencing factors dictating survival or quenching magnetic moment metal–organic molecule, among others, control by axial ligand attachments most promising. Herein, from interplay high-resolution scanning tunneling microscopy imaging/manipulation spectroscopy measurements together with density functional theory...
We present a physically intuitive model of molecular quantum dots beyond the constant interaction approximation. It accurately describes their charging behavior and allows extraction important properties that are otherwise experimentally inaccessible. The is applied to data recorded with noncontact atomic force microscope on three different molecules act as dot when attached tip. results in excellent agreement first-principles simulations.
Abstract Unimolecular current rectifiers are fundamental building blocks in organic electronics. Rectifying behavior has been identified numerous systems due to electron‐hole asymmetries of orbital levels interfaced by a metal electrode. As consequence, the rectifying ratio (RR) determining diode efficiency remains fixed for chosen molecule‐metal interface. Here, mechanically tunable molecular exhibiting an exceptionally large rectification (>10 5 ) and reversible direction is presented....
Open-shell polycyclic aromatic hydrocarbons (PAHs) represent promising building blocks for carbon-based functional magnetic materials. Their properties stem from the presence of unpaired electrons localized in radical states π character. Consequently, these materials are inclined to exhibit spin delocalization, form extended collective states, and respond flexibility molecular backbones. However, they also highly reactive, requiring structural strategies protect reacting with environment....
Abstract Triangulenes are a class of open‐shell triangular graphene flakes with total spin increasing their size. In the last years, on‐surface‐synthesis strategies have permitted fabricating and engineering triangulenes various sizes structures atomic precision. However, direct proof size remains elusive. this work, we report combined in‐solution on‐surface synthesis large nitrogen‐doped triangulene (aza‐[5]‐triangulene) on Au(111) surface, detection its high‐spin ground state....
Organic diradicals are envisioned as elementary building blocks for designing a new generation of spintronic devices and have been used in constructing prototypical field effect transistors nonlinear optical devices. Open-shell systems, however, also reactive, thus requiring design strategies to "protect" their radical character from the environment, especially when they embedded solid-state Here, we report persistence on metallic surface diradical diindeno[b,i]anthracene (DIAn) core...
Abstract Triangulene nanographenes are open‐shell molecules with predicted high spin state due to the frustration of their conjugated network. Their long‐sought synthesis became recently possible over a metal surface. Here, we present macrocycle formed by six [3]triangulenes, which was obtained combining solution dimethylphenyl‐anthracene cyclic hexamer and on‐surface cyclodehydrogenation this precursor gold substrate. The resulting triangulene nanostar exhibits collective generated...
Unimolecular current rectifiers are fundamental building blocks in organic electronics. Rectifying behavior has been identified numerous systems due to electron-hole asymmetries of orbital levels interfaced by a metal electrode. As consequence, the rectifying ratio (RR) determining diode efficiency remains fixed for chosen molecule-metal interface. Here, we present mechanically tunable molecular exhibiting an exceptionally large rectification (>10^5) and reversible direction. The system...
Open-shell polycyclic aromatic hydrocarbons (PAHs) represent promising building blocks for carbon-based functional magnetic materials. Their properties stem from the presence of unpaired electrons localized in radical states $\pi$ character. Consequently, these materials are inclined to exhibit spin delocalization, form extended collective states, and respond flexibility molecular backbones. However, they also highly reactive, requiring structural strategies protect reacting with...
Abstract The scanning tunneling microscope (STM) provides access to atomic-scale properties of a conductive sample. While single-molecule tip functionalization has become standard procedure, fluorescent molecular probes remained absent from the available tool set. Here, plasmonic an STM is functionalized with single molecule and scanned on substrate. current flowing through tip-molecule-substrate junction generates narrow-line emission light corresponding fluorescence negatively charged...
The plasmonic tip of a scanning tunnelling microscope (STM) is functionalized with single fluorescent molecule and scanned on substrate. tunneling current flowing through the tip-molecule-substrate junction generates narrow-line emission light corresponding to fluorescence negatively charged suspended at apex tip, i.e., excited molecular anion (trion). this probe recorded for tip-substrate nanocavities featuring different resonances, distances applied bias voltages, substrates. We...
Triangulenes are open-shell triangular graphene flakes with total spin increasing their size. In the last years, on-surface-synthesis strategies have permitted fabricating and engineering triangulenes of various sizes structures atomic precision. However, direct proof size remains elusive. this work, we report combined in-solution on-surface synthesis a large nitrogen-doped triangulene (aza-[5]-triangulene) detection its high ground state on Au(111) surface. Bond-resolved scanning tunneling...