Publications de Marko Burghard

Seeding and Emergence of Composite Skyrmions in a van der Waals Magnet

Klaus Kern, Marko Burghard, Lukas Powalla

Topological charge plays a significant role in a range of physical systems. In particular, observations of real-space topological objects in magnetic materials have been largely limited to skyrmions - states with a unitary topological charge. Recently, mor ...

Wiley-V C H Verlag Gmbh2023

Single Skyrmion Generation via a Vertical Nanocontact in a 2D Magnet-Based Heterostructure

Klaus Kern, Marko Burghard, Lukas Powalla

Skyrmions have been well studied in chiral magnets and magnetic thin films due to their potential application in practical devices. Recently, monochiral skyrmions have been observed in twodimensional van der Waals magnets. Their atomically flat surfaces an ...

AMER CHEMICAL SOC2022

Berry curvature-induced local spin polarisation in gated graphene/WTe2 heterostructures

Klaus Kern, Marko Burghard, Lukas Powalla

Experimental control of local spin-charge interconversion is of primary interest for spintronics. Van der Waals (vdW) heterostructures combining graphene with a strongly spin-orbit coupled two-dimensional (2D) material enable such functionality by design. ...

Nature Portfolio2022

Electrically tunable quantum emitters in an ultrathin graphene-hexagonal boron nitride van der Waals heterostructure

Klaus Kern, Marko Burghard, Shai Mangel, Alessio Scavuzzo

We explore the photoluminescence (PL) properties of hexagonal boron nitride (h-BN) quantum emitters embedded within atomically thin graphene/h-BN heterostructures fabricated by mechanical transfer. Stable light emission could be observed from h-BN emitters ...

AMER INST PHYSICS2019

Spin-Split Band Hybridization in Graphene Proximitized with alpha-RuCl3 Nanosheets

Klaus Kern, Marko Burghard

Proximity effects induced in the two-dimensional Dirac material graphene potentially open access to novel and intriguing physical phenomena. Thus far, the coupling between graphene and ferromagnetic insulators has been experimentally established. However, ...

AMER CHEMICAL SOC2019

Gate-Tunable Tunneling Transistor Based on a Thin Black Phosphorus-SnSe2 Heterostructure

Klaus Kern, Marko Burghard

Tunneling field-effect transistors (TFETs) are of considerable interest owing to their capability of low-power operation. Here, we demonstrate a novel type of TFET which is composed of a thin black phosphorus-tin diselenide (BP-SnSe2) heterostructure. This ...

2019

Electrical Transport Signature of the Magnetic Fluctuation-Structure Relation in alpha-RuCl3 Nanoflakes

Klaus Kern, Marko Burghard

American Chemical Society (ACS)2018

Electron microscopy of polyoxometalate ions on graphene by electrospray ion beam deposition

Klaus Kern, Stephan Rauschenbach, Marko Burghard, Sabine Abb

2018

Spin filter effect of hBN/Co detector electrodes in a 3D topological insulator spin valve

Klaus Kern, Marko Burghard, Kristina Vaklinova, Katharina Polyudov

2018

Spin Hall photoconductance in a three-dimensional topological insulator at room temperature

Klaus Kern, Marko Burghard, Kristina Vaklinova

Nature Research2018

The classical and quantum dynamics of molecular spins on graphene

Klaus Kern, Stephan Rauschenbach, Marko Burghard

Controlling the dynamics of spins on surfaces is pivotal to the design of spintronic(1) and quantum computing(2) devices. Proposed schemes involve the interaction of spins with graphene to enable surface-state spintronics(3,4) and electrical spin manipulat ...

Nature Publishing Group2016

Thin-layer black phosphorus/GaAs heterojunction p-n diodes (vol 106, 233110, 2015)

Klaus Kern, Marko Burghard, Pascal Gehring

Amer Inst Physics2015

Sub-Terahertz Frequency-Domain Spectroscopy Reveals Single-Grain Mobility and Scatter Influence of Large-Area Graphene

Klaus Kern, Marko Burghard, Alexander Ronald Hoyer

The response of individual domains in wafer-sized chemical vapor deposition graphene is measured by contactless sub-terahertz interferometry, observing the intrinsic optical conductance and reaching very high mobility values. It is shown that charged scatt ...

Wiley-V C H Verlag Gmbh2015

Dimensional crossover in the quantum transport behaviour of the natural topological insulator Aleksite

Klaus Kern, Marko Burghard, Pascal Gehring, Alexander Ronald Hoyer, Kristina Vaklinova

Three-dimensional topological insulators comprise topologically protected surface states displaying massless, Dirac-like linear dispersion with spin-momentum locking. Electrical conduction through such surface states has been documented to manifest itself ...

Nature Publishing Group2015

Thin-layer black phosphorous/GaAs heterojunction p-n diodes

Klaus Kern, Marko Burghard, Pascal Gehring

Owing to its high carrier mobility and thickness-tunable direct band gap, black phosphorous emerges as a promising component of optoelectronic devices. Here, we evaluate the device characteristics of p-n heterojunction diodes wherein thin black phosphorous ...

Amer Inst Physics2015

Tuning the deposition of molecular graphene nanoribbons by surface functionalization

Klaus Kern, Marko Burghard, Alexander Ronald Hoyer

We show that individual, isolated graphene nanoribbons, created with a molecular synthetic approach, can be assembled on functionalised wafer surfaces treated with silanes. The use of surface groups with different hydrophobicities allows tuning the density ...

Royal Soc Chemistry2015

Scaling in the quantum Hall regime of graphene Corbino devices

Klaus Kern, Marko Burghard, Eva Carmen Peters

The scaling behavior of graphene devices in Corbino geometry was investigated through temperature dependent conductivity measurements under magnetic field. Evaluation of the Landau level width as a function of temperature yielded a relatively low temperatu ...

Amer Inst Physics2014

Chemical Modification of Graphene via Hyperthermal Molecular Reaction

Klaus Kern, Stephan Rauschenbach, Marko Burghard, Gordon Rinke, Sabine Abb

Chemical functionalization of graphene is achieved by hyperthermal reaction with azopyridine molecular ions. The one-step, room temperature process takes place in high vacuum (10(7) mbar) using an electrospray ion beam deposition (ES-IBD) setup. For ion su ...

Amer Chemical Soc2014

Evaluation of the toxicity of graphene derivatives on cells of the lung luminal surface

László Forró, Klaus Kern, Arnaud Magrez, Marko Burghard, Lenke Horváth, Beat Schwaller

Graphene-based nanomaterials are expected to have a profound impact on a broad range of applications. However, studies devoted to investigating the putative adverse health effects of these nanomaterials are hugely underrepresented in the current scientific ...

Pergamon-Elsevier Science Ltd2013

Spatially resolved photocurrents in graphene nanoribbon devices

Klaus Kern, Kannan Balasubramanian, Stephan Rauschenbach, Marko Burghard, Adarsh Singh Sagar, Thomas Dufaux

We present here a scanning photocurrent microscopy study of individual graphene nanoribbons, revealing pronounced photocurrent responses close to the nanoribbon/metal contacts. The magnitude of the corresponding photocurrent signal was found to be directly ...

Amer Inst Physics2013