Researchers from AMO GmbH, Oxford Instruments, Cambridge University, RWTH Aachen University and the University of Wuppertal have demonstrated a new method to use PEALD on graphene without introducing defects into the graphene itself.Continue reading “A clever way of protecting graphene”
A collaboration between the groups of Benoit Hackens at UC Louvain and of Christoph Stampfer at RWTH Aachen University solves the puzzle of the fragility of the quantum Hall effect in graphene.
The quantum Hall effect is both a textbook example of topological protection and a central tool of metrology labs. In graphene, the quantum Hall effect can be observed at much higher temperatures than in high mobility semiconductors, but the topological protection turned out to be regrettably less robust.
Using scanning gate microscopy on samples fabricated in the lab of Christoph Stampfer, the team of Benoit Hackens has now been able to pinpoint the cause of the vulnerability of the graphene quantum Hall channels. The results clearly indicate the detrimental role of antidots along the graphene edges and provide insights on how to counteract their influence.
A nice popular account of the work published by UCLouvain can be read here.
Upstream modes and antidots poison graphene quantum Hall effect
N. Moreau, B. Brun, S. Somanchi, , K. Watanabe, T. Taniguchi, C. Stampfer & B. Hackens
Nature Communications 12, 4265 (2021).
Substantial advances in the technology for confining and manipulating electrons in bilayer graphene quantum dots bring the demonstration of graphene-based qubits within reach.Continue reading “Steady progress towards graphene-based qubits”
Two-dimensional (2D) materials have a huge potential for providing devices with much smaller size and extended functionalities with respect to what can be achieved with today’s silicon technologies. But to exploit this potential we must be able to integrate 2D materials into semiconductor manufacturing lines – a notoriously difficult step. A team of researchers from Sweden and Germany now reports a new method to make this work.Continue reading “A scalable method for the large-area integration of 2D materials”
In an invited article in the journal Nature Physics, an international team of researchers lead by RWTH Professor Dante Kennes offer a fresh perspective on the potential of realizing novel and elusive states of matter using twisted van der Waals materials.Continue reading “Twisted van der Waals materials as a material-based quantum simulator”
Novel, fascinating aspects of quantum effects in two-dimensional materials are reported in two new publications by Prof. Dante Kennes and coworkers in Germany and the United States.Continue reading “Quantum matter in two-dimensions”
CVD-grown graphene passed the ultimate test to be considered absolutely on-pair with exfoliated graphene, allowing the observation of clear signatures of the fractional quantum Hall effect.Continue reading “Fractional quantum Hall effect in CVD-grown graphene”
Researchers from TU Wien, AMO GmbH, University of Pisa and Wuppertal University have realized the first operational amplifier based on the two-dimensional semiconductor MoS2, reaching a key milestone towards the vision of a flexible electronics all based on two dimensional materials. This result has just appeared in the journal Nature Electronics.Continue reading “The first operational amplifier based on a two-dimensional material”
Max Lemme and co-workers have recently published a review article on nanoelectromechanical (NEMS) sensors based on suspended two-dimensional (2D) materials in the journal RESEARCH, an open-access multidisciplinary journal launched in 2018 as the first journal in the Science Partner Journal (SPJ) program. The paper is an invited contribution to a special issue on “Progress and challenges in emerging 2D nanomaterials – preparation, processing, and device integration”, and has the purpose of contributing to the development of the field of 2D materials for sensor applications and to their integration with conventional semiconductor technology.Continue reading “Nanoelectromechanical sensors based on 2D materials – a review”
A review article on one of the most delicate issues of future electronics based on 2D materials
A team of scientists led by Tibor Grasser and Yuri Illarionov of TU Wien, including RWTH Professor and AMO Director Max Lemme, has published an extensive review of the current search for suitable insulators for two-dimensional (2D) nanoelectronics in Nature Communications.Continue reading “Insulators for 2D nanoelectronics: the gap to bridge”