A5002705704- Logic, Reasoning, and Knowledge
- Logic, programming, and type systems
- Graphene research and applications
- Advanced Algebra and Logic
- Formal Methods in Verification
- semigroups and automata theory
- Law and Political Science
- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Semantic Web and Ontologies
- 2D Materials and Applications
- European history and politics
- Advanced Database Systems and Queries
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Computability, Logic, AI Algorithms
- Advancements in Photolithography Techniques
- Magnetic Field Sensors Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- Advanced Graph Theory Research
- German History and Society
AMO (Germany)
2015-2025
Institut für Mikroelektronik- und Mechatronik-Systeme
2025
RWTH Aachen University
1996-2024
Ioffe Institute
2024
TU Wien
2024
Siemens (United States)
2023
University of Hagen
2019-2022
Electro Optical Systems (Germany)
2021
Technical University of Darmstadt
2007-2020
FH Aachen
2002-2020
Abstract Integrating two-dimensional (2D) materials into semiconductor manufacturing lines is essential to exploit their material properties in a wide range of application areas. However, current approaches are not compatible with high-volume on wafer level. Here, we report generic methodology for large-area integration 2D by adhesive bonding. Our approach avoids manual handling and uses equipment, processes, that readily available large-scale lines. We demonstrate the transfer CVD graphene...
Electronic devices based on two-dimensional semiconductors suffer from limited electrical stability because charge carriers originating the interact with defects in surrounding insulators. In field-effect transistors, resulting trapped charges can lead to large hysteresis and device drifts, particularly when common amorphous gate oxides (such as silicon or hafnium dioxide) are used, hindering stable circuit operation. Here, we show that graphene-based transistors be improved by Fermi-level...
We report on a method for the fabrication of graphene silicon dioxide substrate by solid-state dissolution an overlying stack carbide and nickel thin film. The carbon dissolves in rapid thermal annealing. Upon cooling, segregates to surface forming layer over entire surface. By wet etching layer, was allowed settle original substrate. Scanning tunneling microscopy (STM) as well Raman spectroscopy has been performed characterization layers. Further insight into morphology layers gained...
The sensitivity of graphene based devices to surface adsorbates and charge traps at the graphene/dielectric interface requires proper device passivation in order operate them reproducibly under ambient conditions. Here we report on use atomic layer deposited aluminum oxide as field effect (GFETs). We show that successful produce hysteresis free DC characteristics, low doping level GFETs stable over weeks though operated stored atmosphere. This is achieved by selecting seed prior deposition...
Graphene is considered a promising material for broadband opto-electronics because of its linear and gapless band structure. Its optical conductivity can be significantly tuned electrostatically by shifting the Fermi level. Using mentioned property, we experimentally demonstrate graphene based electro-absorption modulator with very low insertion loss. The device realized on silicon insulator (SOI) waveguide operating at 1550 nm wavelength. shows modulation depth 16 dB an loss 3.3 dB,...
Abstract Graphene has been considered as a promising material for opto-electronic devices, because of its tunable and wideband optical properties. In this work, we demonstrate electro-refractive phase modulation in graphene at wavelengths from 1530 to 1570 nm. By integrating gated layer silicon-waveguide based Mach-Zehnder interferometer, the key parameters modulator like change effective refractive index, insertion loss absorption are extracted. These experimentally obtained values well...
Additive manufacturing (AM) has changed the entire enterprise by offering unique features for fabrication of complex-shapes with superior mechanical properties. In last decades, through an exponential advancement, AM been promoted from a prototyping to series and mass production platform. Like all conventional techniques, quality assurance procedures/tools are utmost importance in aiding manufacturers management certification. For this purpose, in-line melt pool monitoring devices, installed...
Abstract The commercialization of electronic devices based on graphene has not yet been successful, even 20 years after its first isolation. To this end, the European Commission is supporting research toward establishing a experimental pilot line for and optoelectronic related two-dimensional (2D) materials, namely Experimental Pilot Line (2D-EPL) project. Here, we report results obtained during third multi-project wafer (MPW) runs completed at end 2022 (MPW run 1) 2023 3) as an outcome...
We prove that the satisfiability and finite problems for C/sup 2/ are decidable. is first-order logic with only two variables in presence of arbitrary counting quantifiers 3/sup /spl ges/m/,m/spl ges/1. It considerably extends L/sup plain variables, which known to be decidable by a result Mortimer's. Unlike 2/, does not have model property.
In this paper we describe a new algorithm to prevent fault attacks on RSA signature algorithms using the Chinese Remainder Theorem (CRT-RSA). This variant of is widely used smartcards. Smartcards other hand are particularly susceptible like one described in [7]. Recent results have shown that practical and easy accomplish ([21], [17]).Therefore, they establish need for attack protected CRT-RSA schemes. Starting from careful derivation classification models, algorithm. For most realistic...
The unique property of bilayer graphene to show a band gap tunable by external electrical fields enables variety different device concepts with novel functionalities for electronic, optoelectronic and sensor applications. So far the operation based field effect transistors requires two individual gates vary channel's conductance create gap. In this paper we report on method increase on/off ratio in single gated adsorbate doping. dopants upper side establish displacement perpendicular surface...
Evaluating a Boolean conjunctive query Q against guarded first-order theory F is equivalent to checking whether "F and not Q" unsatisfiable. This problem relevant the areas of database description logic. Since may be guarded, well known results about decidability, complexity, finite-model property fragment do obviously carry over answering theories, had been left open in general. By investigating finite bisimilar covers hypergraphs relational structures, by substantially generalising...
The excellent electronic and mechanical properties of graphene provide a perfect basis for high performance flexible sensor devices. Here, we present the fabrication characterization based Hall sensors. sensors are fabricated on 50 um thick Kapton foil using large scale grown by chemical vapor deposition technique copper foil. Voltage current normalized sensitivities up to 0.096 V/VT 79 V/AT were measured, respectively. These values comparable sensitivity rigid silicon highest reported so...
In recent years, the data traffic has grown exponentially and forecasts indicate a huge market that could be addressed by communication infrastructure service providers. However, processing capacity, space, energy consumption of available technology is serious bottleneck for exploitation these markets. Chip-integrated optical systems hold promise significantly improving issues related to current technology. At moment, answer question which material best suited ultrafast chip integrated still...
Abstract The satisfiability problem for the two-variable fragment of first-order logic is investigated over finite and infinite linearly ordered, respectively wellordered domains, as well domains in which one or several designated binary predicates are interpreted arbitrary wellfounded relations. It shown that FO 2 wellordered. presence well-founded relation, decidable satisfiability. Actually complexity these decision problems essentially same plain unconstrained . namely non-deterministic...
Evaluating a boolean conjunctive query q over guarded first-order theory T is equivalent to checking whether (T \& not q) unsatisfiable. This problem relevant the areas of database and description logic. Since may be guarded, well known results about decidability, complexity, finite-model property fragment do obviously carry answering theories, had been left open in general. By investigating finite bisimilar covers hypergraphs relational structures, by substantially generalising Rosati's...
A well-established and fundamental insight in database theory is that negation (also known as complementation) tends to make queries difficult process reason about. Many basic problems are decidable admit practical algorithms the case of unions conjunctive queries, but become or even undecidable when allowed contain negation. Inspired by recent results finite model theory, we consider a restricted form negation, guarded . We introduce fragment SQL, called GN-SQL, well Datalog with stratified...
Abstract We give a new, simplified and detailed account of the correspondence between levels Sherali–Adams relaxation graph isomorphism pebble-game equivalence with counting (higher-dimensional Weisfeiler–Lehman colour refinement). The basic refinement fractional isomorphism, due to Tinhofer [22; 23] Ramana, Scheinerman Ullman [17], is re-interpreted as base level generalised higher in this sense by Atserias Maneva [1] Malkin [14], who prove that two resulting hierarchies interleave. In...