Publications de Ahmet Avsar | EPFL Graph Search

Electrical spectroscopy of defect states and their hybridization in monolayer MoS2

Andras Kis, Oleg Yazyev, Mukesh Kumar Tripathi, Yanfei Zhao, Ahmet Avsar, Kristians Cernevics, Zhenyu Wang, Juan Francisco Gonzalez Marin, Cheol Yeon Cheon, Hyungoo Ji

Defects in solids are unavoidable and can create complex electronic states that can significantly influence the electrical and optical properties of semiconductors. With the rapid progress in the integration of 2D semiconductors in practical devices, it is ...

Nature Research2023

Engineering Optically Active Defects in Hexagonal Boron Nitride Using Focused Ion Beam and Water

Aleksandra Radenovic, Andras Kis, Georg Fantner, Evgenii Glushkov, Nathan Cyprien Arsène Ronceray, Ahmet Avsar, Vytautas Navikas, Michal Daniel Macha, Cheol Yeon Cheon, Aqeel Ahmed

Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over ...

AMER CHEMICAL SOC2022

Excitonic devices with van der Waals heterostructures: valleytronics meets twistronics

Andras Kis, Fedele Tagarelli, Ahmet Avsar, Alberto Ciarrocchi

2D semiconducting transition metal dichalcogenides comprise an emerging class of materials with distinct properties, including large exciton binding energies that reach hundreds of millielectronvolts and valley-contrasting physics. Thanks to the van der Wa ...

2022

Anomalous interfacial dynamics of single proton charges in binary aqueous solutions

Aleksandra Radenovic, Evgenii Glushkov, Jean Camille Benjamin Comtet, Ahmet Avsar, Miao Zhang

Our understanding of the dynamics of charge transfer between solid surfaces and liquid electrolytes has been hampered by the difficulties in obtaining interface, charge, and solvent-specific information at both high spatial and temporal resolution. Here, w ...

AMER ASSOC ADVANCEMENT SCIENCE2021

Probing magnetism in atomically thin semiconducting PtSe2

Andras Kis, Oleg Yazyev, Mukesh Kumar Tripathi, Ahmet Avsar, Michele Pizzochero, Alberto Ciarrocchi, Cheol Yeon Cheon

Atomic-scale disorder in two-dimensional transition metal dichalcogenides is often accompanied by local magnetic moments, which can conceivably induce long-range magnetic ordering into intrinsically non-magnetic materials. Here, we demonstrate the signatur ...

Nature Research2020

Direct observation of water-mediated single-proton transport between hBN surface defects

Aleksandra Radenovic, Evgenii Glushkov, Ahmet Avsar, Jean Camille Benjamin Comtet, Benoît Grosjean

Super-resolution microscopy of defects in a two-dimensional material unveils the transport of single proton charges at solid/water interfaces. Aqueous proton transport at interfaces is ubiquitous and crucial for a number of fields, ranging from cellular tr ...

2020

Logic-in-memory based on an atomically thin semiconductor

Aleksandra Radenovic, Andras Kis, Mukesh Kumar Tripathi, Ahmet Avsar, Yanfei Zhao, Guilherme Migliato Marega, Zhenyu Wang

The growing importance of applications based on machine learning is driving the need to develop dedicated, energy-efficient electronic hardware. Compared with von Neumann architectures, which have separate processing and storage units, brain-inspired in-me ...

2020

Colloquium: Spintronics in graphene and other two-dimensional materials

Ahmet Avsar

After the first unequivocal demonstration of spin transport in graphene [Tombros et al., Nature (London) 448, 571-574 (2007)], surprisingly at room temperature, it was quickly realized that this novel material was relevant for both fundamental spintronics ...

2020

Excitonic device and operating methods thereof

Andras Kis, Ahmet Avsar, Dmitrii Unuchek, Alberto Ciarrocchi

The present disclosure concerns an excitonic device including at least one heterostructure comprising or consisting solely of a first two-dimensional material or layer and a second two-dimensional material or layer. The at least one heterostructure being c ...

2019

Valley-polarized exciton currents in a van der Waals heterostructure

Andras Kis, Ahmet Avsar, Dmitrii Unuchek, Alberto Ciarrocchi, Zhe Sun

2019