Publications (37)
Properties of quantum emitters in different hBN sample types particularly suited for nanophotonic integration
Ambika Shorny, Hardy Schauffert, James C. Stewart +11
Single photon emitters in two-dimensional (2D) hexagonal boron nitride (hBN) are promising solid-state quantum emitters for photonic applications and quantum networks. Despite thei…
Ultrafast dynamics of bright and dark excitons in monolayer WSe and heterobilayer WSe/MoS
Jan Philipp Bange, Paul Werner, David Schmitt +15
The energy landscape of optical excitations in mono- and few-layer transition metal dichalcogenides (TMDs) is dominated by optically bright and dark excitons. These excitons can be…
Imaging of optically active defects with nanometer resolution
Jiandong Feng, Hendrik Deschout, Sabina Caneva +4
Point defects significantly influence the optical and electrical properties of solid-state materials due to their interactions with charge carriers, which reduce the band-to-band o…
Active terahertz modulator and slow light metamaterial devices with hybrid graphene-superconductor photonic integrated circuits
Samane Kalhor, Stephan J. Kindness, Robert Wallis +9
Metamaterial photonic integrated circuits with arrays of hybrid graphene-superconductor coupled split-ring resonators (SRR) capable of modulating and slowing down terahertz (THz) l…
Selective synthesis of large-area monolayer tin sulfide from simple substances
Kazuki Koyama, Jun Ishihara, Takeshi Odagawa +11
Both tin monosulfide (SnS) and tin disulfide (SnS2) are thermodynamically stable layered materials with potential for spin-valleytronic devices and photodetectors. Notably, monolay…
The bright side of defects in MoS and WS and a generalizable chemical treatment protocol for defect passivation
Hope M. Bretscher, Zhaojun Li, James Xiao +12
Structural defects are widely regarded as detrimental to the optoelectronic properties of monolayer transition metal dichalcogenides, leading to concerted efforts to eliminate defe…
Wide-field spectral super-resolution mapping of optically active defects in hBN
Jean Comtet, Evgenii Glushkov, Vytautas Navikas +6
Point defects can have significant impacts on the mechanical, electronic and optical properties of materials. The development of robust, multidimensional, high-throughput and large…
Raman Spectral Indicators of Catalyst Decoupling for Transfer of CVD Grown 2D Materials
Patrick R. Whelan, Bjarke S. Jessena, Ruizhi Wang +10
Through a combination of monitoring the Raman spectral characteristics of 2D materials grown on copper catalyst layers, and wafer scale automated detection of the fraction of trans…
Electrochemically-gated Graphene Broadband Microwave Waveguides for Ultrasensitive Biosensing
Patrik Gubeljak, Tianhui Xu, Lorenzo Pedrazzetti +5
Identification of non-amplified DNA sequences and single-base mutations is essential for molecular biology and genetic diagnostics. This paper reports a novel sensor consisting of…
Multi-dimensional microwave sensing using graphene waveguides
Patrik Gubeljak, Lorenzo Pedrazzetti, Oliver J. Burton +4
This paper presents an electrolytically gated broadband microwave sensor where atomically-thin graphene layers are integrated into coplanar waveguides and coupled with microfluidic…
The role of non-equilibrium populations in dark exciton formation
Paul Werner, Wiebke Bennecke, Jan Philipp Bange +15
In two-dimensional transition metal dichalcogenide structures, the optical excitation of a bright exciton may be followed by the formation of a plethora of lower energy dark states…
Measuring the Nonlinear Refractive Index of Graphene using the Optical Kerr Effect Method
Evdokia Dremetsika, Bruno Dlubak, Simon-Pierre Gorza +8
By means of the ultrafast optical Kerr effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third order nonlinear response of graphene at telecom wa…
Achieving 100% amplitude modulation depth in a graphene-based tuneable capacitance metamaterial
Ruqiao Xia, Nikita W. Almond, Stephen J. Kindness +12
Effective control of terahertz radiation requires the development of efficient and fast modulators with a large modulation depth. This challenge is often tackled by using metamater…
Substrate-assisted nucleation of ultra-thin dielectric layers on graphene by atomic layer deposition
Bruno Dlubak, Piran R. Kidambi, Robert S. Weatherup +2
We report on a large improvement in the wetting of Al2O3 thin films grown by un-seeded atomic layer deposition on monolayer graphene, without creating point defects. This enhanced…
A foundation model for atomistic materials chemistry
Ilyes Batatia, Philipp Benner, Yuan Chiang +85
Atomistic simulations of matter, especially those that leverage first-principles (ab initio) electronic structure theory, provide a microscopic view of the world, underpinning much…
Spectrally-Resolved Photodynamics of Individual Emitters in Large-Area Monolayers of Hexagonal-Boron Nitride
Hannah L. Stern, Ruizhi Wang, Ye Fan +9
Hexagonal boron nitride (h-BN) is a 2D, wide band-gap semiconductor that has recently been shown to display bright room-temperature emission in the visible region, sparking immense…
Tunable Klein-like tunneling of high-temperature superconducting pairs into graphene
David Perconte, Fabian A. Cuellar, Constance Moreau-Luchaire +9
Superconductivity can be induced in a normal material via the leakage of superconducting pairs of charge carriers from an adjacent superconductor. This so-called proximity effect i…
Formation of moiré interlayer excitons in space and time
David Schmitt, Jan Philipp Bange, Wiebke Bennecke +11
Moiré superlattices in atomically thin van-der-Waals heterostructures hold great promise for an extended control of electronic and valleytronic lifetimes, the confinement of excit…
Forming and Compliance-free Operation of Low-energy, Fast-switching HfOS/HfS Memristors
Aferdita Xhameni, AbdulAziz AlMutairi, Xuyun Guo +5
We demonstrate low energy, forming and compliance-free operation of a resistive memory obtained by the partial oxidation of a two-dimensional layered van-der-Waals semiconductor: h…
Ultrafast nano-imaging of dark excitons
David Schmitt, Jan Philipp Bange, Wiebke Bennecke +15
The role and impact of spatial heterogeneity in two-dimensional quantum materials represents one of the major research quests regarding the future application of these materials in…
Bridging the Band Gap: What Device Physicists Need to Know About Machine Learning
Nathaniel Tye, Stephan Hofmann, Phillip Stanley-Marbell
This article surveys the landscape of semiconductor materials and devices research for the acceleration of machine learning (ML) algorithms. We observe a disconnect between the sem…
Plasma-enhanced atomic layer deposition of AlO on graphene using monolayer hBN as interfacial layer
Barbara Canto, Martin Otto, Michael J. Powell +7
The deposition of dielectric materials on graphene is one of the bottlenecks for unlocking the potential of graphene in electronic applications. In this paper we demonstrate the pl…
Resolving the Nucleation Stage in Atomic Layer Deposition of Hafnium Oxide on Graphene
Bernhard C. Bayer, Adrianus I. Aria, Dominik Eder +2
The integration of two-dimensional (2D) materials with functional non-2D materials such as metal oxides is of key importance for many applications, but underlying mechanisms for su…
The 2D Materials Roadmap
Wencai Ren, Peter Bøggild, Joan Redwing +70
Over the past two decades, 2D materials have rapidly evolved into a diverse and expanding family of material platforms. Many members of this materials class have demonstrated their…
Imaging Light-Induced Migration of Dislocations in Halide Perovskites with 3D Nanoscale Strain Mapping
Kieran W. P. Orr, Jiecheng Diao, Muhammad Naufal Lintangpradipto +14
In recent years, halide perovskite materials have been used to make high performance solar cell and light-emitting devices. However, material defects still limit device performance…
Controlled Fabrication of Native Ultra-Thin Amorphous Gallium Oxide from 2D Gallium Sulfide for Emerging Electronic Applications
AbdulAziz AlMutairi, Aferdita Xhameni, Xuyun Guo +4
Oxidation of two-dimensional (2D) layered materials has proven advantageous in creating oxide/2D material heterostructures, opening the door for a new paradigm of low-power electro…
Probing correlations in the exciton landscape of a moiré heterostructure
Jan Philipp Bange, David Schmitt, Wiebke Bennecke +13
Excitons are two-particle correlated bound states that are formed due to Coulomb interaction between single-particle holes and electrons. In the solid-state, cooperative interactio…
GFET Lab: A Graphene Field-Effect Transistor TCAD Tool
Nathaniel J. Tye, Abdul Wadood Tadbier, Stephan Hofmann +1
Graphene field-effect transistors (GFETs) are experimental devices which are increasingly seeing commercial and research applications. Simulation and modelling forms an important s…
Oxidising and carburising catalyst conditioning for the controlled growth and transfer of large crystal monolayer hexagonal boron nitride
Vitaliy Babenko, Ye Fan, Vlad-Petru Veigang-Radulescu +9
Hexagonal boron nitride (h-BN) is well-established as a requisite support, encapsulant and barrier for 2D material technologies, but also recently as an active material for applica…
Giant Photoluminescence Enhancement in MoSe monolayers treated with Oleic Acid Ligands
Arelo O. A Tanoh, Jack Alexander-Webber, Ye Fan +6
The inherently low photoluminescence (PL) yields in as prepared transition metal dichalcogenide (TMD) monolayers are broadly accepted to be the result of atomic vacancies (i.e. def…
Measuring the Proton Selectivity of Graphene Membranes
Michael I. Walker, Philipp Braeuninger-Weimar, Robert S. Weatherup +2
By systematically studying the proton selectivity of free-standing graphene membranes in aqueous solutions we demonstrate that protons are transported by passing through defects. W…
Compressive Behavior and Failure Mechanisms of Freestanding and Composite 3D Graphitic Foams
Kenichi Nakanishi, Adrianus I. Aria, Matthew Berwind +4
Open-cell graphitic foams were fabricated by chemical vapor deposition using nickel templates and their compressive responses were measured over a range of relative densities. The…
Graphene-Passivated Nickel as an Oxidation-Resistant Electrode for Spintronics
Bruno Dlubak, Marie-Blandine Martin, Robert S. Weatherup +9
We report on graphene-passivated ferromagnetic electrodes (GPFE) for spin devices. GPFE are shown to act as spin-polarized oxidation-resistant electrodes. The direct coating of nic…
Non-equilibrium properties of graphene probed by superconducting tunnel spectroscopy
Simon Zihlmann, Péter Makk, Sebastián Castilla +6
We report on non-equilibrium properties of graphene probed by superconducting tunnel spectroscopy. A hexagonal boron nitride (hBN) tunnel barrier in combination with a superconduct…
A peeling approach for integrated manufacturing of large mono-layer h-BN crystals
Ruizhi Wang, David G. Purdie, Ye Fang +8
Hexagonal boron nitride (h-BN) is the only known material aside from graphite with a structure composed of simple, stable, non-corrugated atomically thin layers. While historically…
Recommendations and tools to enable reproducibility in 2D materials research
Peter Bøggild, Timothy John Booth, Bjarke Sørensen Jessen +9
Research on 2D materials has achieved significant milestones and fuelled a rapidly growing industrial sector. This progress, however, is accompanied by challenges in reproducibilit…
Putting high-index Cu on the map for high-yield, dry-transferred CVD graphene
Oliver J. Burton, Zachary C. M. Winter, Kenji Watanabe +4
Reliable, clean transfer and interfacing of 2D material layers is technologically as important as their growth. Bringing both together remains a challenge due to the vast, intercon…