150 citations · 1.3k across the 37 of their papers we have counts for
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Competition between vacancy creation and filling in defect-engineering of hBN
Shrirang Chokappa, Manuel Längle, Barbara Maria Mayer +13
Hexagonal boron nitride (hBN) has recently become the focus of intense research as a material that can host quantum emitters. It is known that such emission is related to point def…
Single photon emitters in hBN: Limitations of atomic resolution imaging and potential sources of error
David Lamprecht, Shrirang Chokappa, Alissa M. Freilinger +9
There is a growing interest in identifying the origin of single-photon emission in hexagonal boron nitride (hBN), with proposed candidates including boron and nitrogen vacancies as…
Atomically clean free-standing two-dimensional materials through heating in ultra-high vacuum
Philipp Irschik, David Lamprecht, Shrirang Chokappa +6
Surface contamination not only influences but in some cases even dominates the measured properties of two-dimensional materials. Although different cleaning methods are often used…
Self-ion implantation and structural relaxation in amorphous silicon
J. M. Gibson, Robe Elliman, T. Susi +1
Self-ion implantation amorphization is an established approach to study the structure and properties of amorphous silicon (a-Si). Fluctuation Electron Microscopy (FEM) has consiste…
Origin of circular and triangular pores in electron-irradiated hexagonal boron nitride
Umair Javed, Manuel Langle, Vladimir Zobac +9
For nearly two decades, it has been known that electron irradiation of hexagonal boron nitride (hBN) in a transmission electron microscope leads to the formation of triangular pore…
Uncovering the atomic structure of substitutional platinum dopants in MoS with single-sideband ptychography
David Lamprecht, Anna Benzer, Manuel Längle +5
We substitute individual Pt atoms into monolayer MoS and study the resulting atomic structures with single-sideband (SSB) ptychography supported by ab initio simulations. We de…
Hexatic Phase in Covalent Two-Dimensional Silver Iodide
Thuy An Bui, David Lamprecht, Jacob Madsen +10
According to the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) theory, the transition from a solid to liquid in two dimensions proceeds through an orientationally ordered liqui…
Corrugation-dominated mechanical softening of defect-engineered graphene
Wael Joudi, Rika Saskia Windisch, Alberto Trentino +7
We measure the two-dimensional elastic modulus of atomically clean defect-engineered graphene with a known defect distribution and density in correlated ultra-high va…
Electron-irradiation effects on monolayer MoS2 at elevated temperatures
Carsten Speckmann, Kimmo Mustonen, Diana Propst +2
The effect of electron irradiation on 2D materials is an important topic, both for the correct interpretation of electron microscopy experiments and for possible applications in el…
Defect-engineering hexagonal boron nitride using low-energy Ar+ irradiation
Manuel Längle, Barbara Maria Mayer, Jacob Madsen +7
Monolayer hexagonal boron nitride (hBN) has recently become the focus of intense research as a material to host quantum emitters. Although it is well known that such emission is as…
Combined electronic excitation and knock-on damage in monolayer MoS2
Carsten Speckmann, Julia Lang, Jacob Madsen +7
Electron irradiation-induced damage is often the limiting factor in imaging materials prone to ionization or electronic excitations due to inelastic electron scattering. Quantifyin…
Atomic-scale Oxygen-mediated Etching of 2D MoS and MoTe
E. Harriet Åhlgren, Alexander Markevich, Sophie Scharinger +6
Some of the materials are more affected by oxidation than others. To elucidate the oxidation-induced degradation mechanisms in transition metal chalcogenides, the chemical effects…
Towards Exotic Layered Materials: 2D Cuprous Iodide
Kimmo Mustonen, Christoph Hofer, Peter Kotrusz +10
Heterostructures composed of two-dimensional (2D) materials are already opening many new possibilities in such fields of technology as electronics and magnonics, but far more could…
Chemistry at graphene edges in the electron microscope
Gregor T. Leuthner, Toma Susi, Clemens Mangler +2
Transmission electron microscopy (TEM) and scanning TEM (STEM) are indispensable tools for materials characterization. However, during a typical (S)TEM experiment, the sample is su…
Resolving Few-Layer Antimonene/Graphene Heterostructures
Tushar Gupta, Kenan Elibol, Stefan Hummel +6
Two-dimensional (2D) antimony (Sb, antimonene) recently attracted interest due to its peculiar electronic properties and its suitability as anode material in next generation batter…
Single indium atoms and few-atom indium clusters anchored onto graphene via silicon heteroatoms
Kenan Elibol, Clemens Mangler, David D. O'Regan +7
Single atoms and few-atom nanoclusters are of high interest in catalysis and plasmonics, but pathways for their fabrication and stable placement remain scarce. We report here the s…
CuAu, a hexagonal two-dimensional metal
Georg Zagler, Michele Reticcioli, Clemens Mangler +3
Growth of two-dimensional metals has eluded materials scientists since the discovery of the atomically thin graphene and other covalently bound 2D materials. Here, we report a two-…
Electron-Beam Manipulation of Silicon Impurities in Single-Walled Carbon Nanotubes
Kimmo Mustonen, Alexander Markevich, Mukesh Tripathi +7
The recent discovery that impurity atoms in crystals can be manipulated with focused electron irradiation has opened novel perspectives for top-down atomic engineering. These achie…
Si Substitution in Nanotubes and Graphene via Intermittent Vacancies
Heena Inani, Kimmo Mustonen, Alexander Markevich +7
The properties of single-walled carbon nanotubes (SWCNTs) and graphene can be modified by the presence of covalently bound impurities. Although this can be achieved by introducing…
Intrinsic core level photoemission of suspended graphene
Toma Susi, Mattia Scardamaglia, Kimmo Mustonen +11
X-ray photoelectron spectroscopy of graphene is important both for its characterization and as a model for other carbon materials. Despite great recent interest, the intrinsic phot…
Structure evolution of hcp/ccp metal oxide interfaces in solid-state reactions
C. Li, G. Habler, T. Griffiths +7
The structure of crystalline interfaces plays an important role in solid-state reactions. The Al2O3/MgAl2O4/MgO system provides an ideal model system for investigating the mechanis…
Automated image acquisition for low-dose STEM at atomic resolution
Andreas Mittelberger, Christian Kramberger, Christoph Hofer +2
Beam damage is a major limitation in electron microscopy that becomes increasingly severe at higher resolution. One possible route to circumvent radiation damage, which forms the b…
Electron-Beam Manipulation of Silicon Dopants in Graphene
Mukesh Tripathi, Andreas Mittelberger, Nicholas A. Pike +5
The direct manipulation of individual atoms in materials using scanning probe microscopy has been a seminal achievement of nanotechnology. Recent advances in imaging resolution and…
Buckyball sandwiches
Rasim Mirzayev, Kimmo Mustonen, Mohammad R. A. Monazam +6
Two-dimensional (2D) materials have considerably expanded the field of materials science in the last decade. Even more recently, various 2D materials have been assembled into verti…