Publications (49)
Graphene photodetector integrated on a photonic crystal defect waveguide
Simone Schuler, Daniel Schall, Daniel Neumaier +4
We present a graphene photodetector for telecom applications based on a silicon photonic crystal defect waveguide. The photonic structure is used to confine the propagating light i…
The albedo-color diversity of transneptunian objects
Pedro Lacerda, Sonia Fornasier, Emmanuel Lellouch +9
We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized transneptunian objects. A color-albed…
Modern Minimal Perfect Hashing: A Survey
Hans-Peter Lehmann, Thomas Mueller, Rasmus Pagh +4
Given a set of keys, a perfect hash function for maps the keys in to the first integers without collisions. It may return an arbitrary result for any key…
Thermal light emission from monolayer MoS2
Lukas Dobusch, Simone Schuler, Vasili Perebeinos +1
Because of their strong excitonic photoluminescence (PL) and electroluminescence (EL), together with an excellent electronic tunability, transition metal dichalcogenide (TMD) semic…
Stoichiometric YFe2O4-δ single crystals grown by the optical floating zone method
Thomas Mueller, Joost de Groot, Joerg Strempfer +1
We report the growth of YFe2O4-δ single crystals by the optical floating zone method, showing for the first time the same magnetization as highly stoichiometric (δ= 0.00) powder…
Photovoltaic effect in an electrically tunable van der Waals heterojunction
Marco M. Furchi, Andreas Pospischil, Florian Libisch +2
Semiconductor heterostructures form the cornerstone of many electronic and optoelectronic devices and are traditionally fabricated using epitaxial growth techniques. More recently,…
Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
Thomas Mueller, Ermin Malic
Two-dimensional group-VI transition metal dichalcogenide semiconductors, such as MoS2, WSe2 and others, exhibit strong light-matter coupling and possess direct band gaps in the inf…
Real-time image processing with a 2D semiconductor neural network vision sensor
Lukas Mennel, Joanna Symonowicz, Stefan Wachter +3
In recent years, machine vision has taken huge leaps and is now becoming an integral part of various intelligent systems, including autonomous vehicles, robotics, and many others.…
Thermal Infrared and Optical Photometry of Asteroidal Comet C/2002 CE
Tomohiko Sekiguchi, Seidai Miyasaka, Budi Dermawan +4
C/2002 CE is an object in a retrograde elliptical orbit with Tisserand parameter indicating a likely origin in the Oort Cloud. It appears to be a rather inactive co…
Microcavity-integrated graphene photodetector
Marco Furchi, Alexander Urich, Andreas Pospischil +8
The monolithic integration of novel nanomaterials with mature and established technologies has considerably widened the scope and potential of nanophotonics. For example, the integ…
Wavefronts and Light Cones for Kerr Spacetimes
Francisco Frutos-Alfaro, Frank Grave, Thomas Mueller +1
We investigate the light propagation by means of simulations of wavefronts and light cones for Kerr spacetimes. Simulations of this kind give us a new insight to better understand…
First measurement of reactor neutrino oscillations at JUNO
Angel Abusleme, Thomas Adam, Kai Adamowicz +1131
Neutrino oscillations, a quantum effect manifesting at macroscopic scales, are governed by lepton flavor mixing angles and neutrino mass-squared differences that are fundamental pa…
Black Phosphorus Mid-Infrared Photodetectors with High Gain
Qiushi Guo, Andreas Pospischil, Maruf Bhuiyan +11
Recently, black phosphorus (BP) has joined the two dimensional material family as a promising candidate for photonic applications, due to its moderate bandgap, high carrier mobilit…
Mechanisms of photoconductivity in atomically thin MoS2
Marco M. Furchi, Dmitry K. Polyushkin, Andreas Pospischil +1
Atomically thin transition metal dichalcogenides have emerged as promising candidates for sensitive photodetection. Here, we report a photoconductivity study of biased mono- and bi…
Solar-energy conversion and light emission in an atomic monolayer p-n diode
Andreas Pospischil, Marco M. Furchi, Thomas Mueller
Two-dimensional (2D) atomic crystals, such as graphene and atomically thin transition metal dichalcogenides (TMDCs), are currently receiving a lot of attention. They are crystallin…
Efficient narrow-band light emission from a single carbon nanotube p-n diode
Thomas Mueller, Megumi Kinoshita, Mathias Steiner +4
Electrically-driven light emission from carbon nanotubes could be exploited in nano-scale lasers and single-photon sources, and has therefore been the focus of much research. Howev…
Atomically thin p-n junctions based on two-dimensional materials
Riccardo Frisenda, Aday J Molina-Mendoza, Thomas Mueller +2
Recent research in two-dimensional (2D) materials has boosted a renovated interest in the p-n junction, one of the oldest electrical components which can be used in electronics and…
High-responsivity graphene photodetectors integrated on silicon microring resonators
Simone Schuler, Jakob E. Muench, Alfonso Ruocco +9
Graphene integrated photonics provides several advantages over conventional Si photonics. Single layer graphene (SLG) enables fast, broadband, and energy-efficient electro-optic mo…
Intrinsic response time of graphene photodetectors
Alexander Urich, Karl Unterrainer, Thomas Mueller
Graphene-based photodetectors are promising new devices for high-speed optoelectronic applications. However, despite recent efforts, it is not clear what determines the ultimate sp…
JWST Observations of Asteroid 2024 YR4 Rule Out a 2032 Lunar Impact and Demonstrate a New Regime for Planetary Defense Follow-up
Julien de Wit, Andrew S. Rivkin, Marco Micheli +12
At the end of its discovery apparition, the 60 m near-Earth object 2024 YR4 was associated with a non-zero probability of lunar impact during its 2032 December 22 close appro…
Analogue two-dimensional semiconductor electronics
Dmitry K. Polyushkin, Stefan Wachter, Lukas Mennel +6
While digital electronics has become entirely ubiquitous in today's world and appears in the limelight, analogue electronics is still playing a crucial role in many devices and app…
Catalogue of Spacetimes
Thomas Mueller, Frank Grave
The Catalogue of Spacetimes is a collection of four-dimensional Lorentzian spacetimes in the context of the General Theory of Relativity (GR). The aim of the catalogue is to give a…
Sparse pixel image sensor
Lukas Mennel, Dmitry K. Polyushkin, Dohyun Kwak +1
As conventional frame-based cameras suffer from high energy consumption and latency, several new types of image sensors have been devised, with some of them exploiting the sparsity…
Photocurrent imaging and efficient photon detection in a graphene transistor
Fengnian Xia, Thomas Mueller, Roksana Golizadeh-mojarad +5
We measure the channel potential of a graphene transistor using a scanning photocurrent imaging technique. We show that at a certain gate bias, the impact of the metal on the chann…
Low-voltage 2D materials-based printed field-effect transistors for integrated digital and analog electronics on paper
Silvia Conti, Lorenzo Pimpolari, Gabriele Calabrese +13
Paper is the ideal substrate for the development of flexible and environmentally sustainable ubiquitous electronic systems, which, combined with two-dimensional materials, could be…
Device physics of van der Waals heterojunction solar cells
Marco M. Furchi, Florian Höller, Lukas Dobusch +3
Heterostructures based on atomically thin semiconductors are considered a promising emerging technology for the realization of ultrathin and ultralight photovoltaic solar cells on…
Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe and CrGeTe: towards intrinsic gap-tunability
Fengfeng Zhu, Lichuan Zhang, Xiao Wang +14
The bosonic analogues of topological insulators have been proposed in numerous theoretical works, but their experimental realization is still very rare, especially for spin systems…
3D XY Universality and Nonlinear magnetic susceptibility in a kagome ice compound
Kan Zhao, Hao Deng, Hua Chen +11
Kagome spin ice is an intriguing class of spin systems constituted by in-plane Ising spins with ferromagnetic interaction residing on the kagome lattice, theoretically predicted to…
Meeting the Scaling Challenge for Post-Silicon Nanoelectronics using CaF2 Insulators
Yury Yu. Illarionov, Alexander G. Banshchikov, Dmitry K. Polyushkin +10
Two-dimensional (2D) semiconductors have been suggested both for ultimately-scaled field-effect transistors (FETs) and More-than-Moore nanoelectronics. However, these targets can n…
A photosensor employing data-driven binning for ultrafast image recognition
Lukas Mennel, Aday J. Molina-Mendoza, Matthias Paur +6
Pixel binning is a technique, widely used in optical image acquisition and spectroscopy, in which adjacent detector elements of an image sensor are combined into larger pixels. Thi…
X-ray performance of critical-angle transmission grating prototypes for the Arcus mission
Ralf K. Heilmann, Alexander R. Bruccoleri, Vadim Burwitz +12
Arcus is a proposed soft x-ray grating spectrometer Explorer. It aims to explore cosmic feedback by mapping hot gases within and between galaxies and galaxy clusters and characteri…
Optical imaging of strain in two-dimensional crystals
Lukas Mennel, Marco M. Furchi, Stefan Wachter +3
Strain engineering is widely used in material science to tune the (opto-)electronic properties of materials and enhance the performance of devices. Two-dimensional atomic crystals…
Controlled generation of a pn-junction in a waveguide integrated graphene photodetector
Simone Schuler, Daniel Schall, Daniel Neumaier +5
With its electrically tunable light absorption and ultrafast photoresponse, graphene is a promising candidate for high-speed chip-integrated photonics. The generation mechanisms of…
Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors
Matthias Paur, Aday J. Molina-Mendoza, Rudolf Bratschitsch +3
Light emission from higher-order correlated excitonic states has been recently reported in hBN-encapsulated monolayer WSe2 and WS2 upon optical excitation. These exciton complexes…
Ultrafast graphene photodetector
Fengnian Xia, Thomas Mueller, Yu-ming Lin +2
The electronic properties of graphene are unique and are attracting increased attention to this novel 2-dimensional system. Its photonic properties are not less impressive. For exa…
Graphene photodetectors for high-speed optical communications
Thomas Mueller, Fengnian Xia, Phaedon Avouris
While silicon has dominated solid-state electronics for more than four decades, a variety of new materials have been introduced into photonics to expand the accessible wavelength r…
Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi
Fengfeng Zhu, Xiao Wang, Martin Meven +10
We report here a comprehensive study of the AFM structures of the Eu and Mn magnetic sublattices as well as the interplay between Eu and Mn magnetism in this compound by using both…
CMOS-compatible graphene photodetector covering all optical communication bands
Andreas Pospischil, Markus Humer, Marco M. Furchi +4
Optical interconnects are becoming attractive alternatives to electrical wiring in intra- and inter-chip communication links. Particularly, the integration with silicon complementa…
On residuals of finite groups
Stefanos Aivazidis, Thomas Mueller
A theorem of Dolfi, Herzog, Kaplan, and Lev \cite[Thm.~C]{DHKL} asserts that in a finite group with trivial Fitting subgroup, the size of the soluble residual of the group is bound…
Optimizing the search for resources by sharing information: Mongolian gazelles as a case study
Ricardo MartÃnez-GarcÃa, Justin M. Calabrese, Thomas Mueller +2
We investigate the relationship between communication and search efficiency in a biological context by proposing a model of Brownian searchers with long-range pairwise interaction.…
Neutrino Physics with JUNO
Fengpeng An, Guangpeng An, Qi An +224
The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kton multi-purpose underground liquid scintillator detector, was proposed with the determination of the neutrino mass hie…
Hydrostatic pressure effects in the Kitaev quantum magnet -RuCl: A single-crystal neutron diffraction study
Xiao Wang, Fengfeng Zhu, Navid Qureshi +5
We report a comprehensive single-crystal neutron diffraction investigation of the Kitaev quantum magnet -RuCl under hydrostatic pressure. Utilizing a He-gas pressure cell…
Initial performance results of the JUNO detector
Angel Abusleme, Thomas Adam, Kai Adamowicz +1131
The Jiangmen Underground Neutrino Observatory (JUNO) started physics data taking on 26 August 2025. JUNO consists of a 20-kton liquid scintillator central detector, surrounded by a…
A trip to the end of the universe and the twin paradox
Thomas Mueller, Andreas King, Daria Adis
In principle, the twin paradox offers the possibility to go on a trip to the center of our galaxy or even to the end of our universe within life time. In order to be a most comfort…
Flat band-engineered spin-density wave and the emergent multi- magnetic state in the topological kagome metal MnSn
Xiao Wang, Fengfeng Zhu, Xiuxian Yang +16
Magnetic kagome metals, in which topologically non-trivial band structures and electronic correlation are intertwined, have recently emerged as an exciting platform to explore exot…
Optically transparent and thermally efficient 2D MoS2 heaters integrated with silicon microring resonators
Dor Oz, Nathan Suleymanov, Boris Minkovich +5
Thermal tuning of the optical refractive index in the waveguides to control light phase accumulation is essential in photonic integrated systems and applications. In silicon photon…
A microprocessor based on a two-dimensional semiconductor
Stefan Wachter, Dmitry K. Polyushkin, Ole Bethge +1
The advent of microcomputers in the 1970s has dramatically changed our society. Since then, microprocessors have been made almost exclusively from silicon, but the ever-increasing…
ASIME 2016 White Paper: In-Space Utilisation of Asteroids: "Answers to Questions from the Asteroid Miners"
Amara L. Graps, Philippe Blondel, Grant Bonin +28
The aim of the Asteroid Science Intersections with In-Space Mine Engineering (ASIME) 2016 conference on September 21-22, 2016 in Luxembourg City was to provide an environment for t…
Scaling of the normal coefficient of restitution for wet impacts
Thomas Mueller, Frank Gollwitzer, Christof Kruelle +2
A thorough understanding of the energy dissipation in the dynamics of wet granular matter is essential for a continuum description of natural phenomena such as debris flow, and the…