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Publication Highlights | Recent Publications

Landau-Zener transition in a single-molecule spin transistor

Landau-Zener dynamics of a single-ion magnet has been continuously monitored and theoretically modeled in a spin-transistor geometry.

Phys. Rev. Lett. 118, 257701 (2017)
Sub-50 nm channel vertical field-effect transistors

A printed vertical FET which decouples the channel length from printing resolution has been demonstrated.

Adv. Mater. 29, 1603858 (2017)
Background intensity suppression in fluorescence nanoscopy

Stimulated emission double depletion has been demonstrated as a method to selectively remove artificial background intensity.

Nat. Photon. 11, 163 (2017)
spin valve
Giant magnetoresistance in carbon nanotubes with single-molecule magnets

Gate-controlled supramolecular spin-valve effect has been demonstrated and explained in terms of Fano resonances in Coulomb blockade.

ACS Nano 11, 6868 (2017)
Hybrid supercapacitors for reversible control of magnetism

Fully reversible and robust magnetoelectric coupling has been realized in LaSrMnO/ionic liquid hybrid supercapacitors by exploiting surface electrostatic and electrochemical doping.

Nat. Commun. 8, 15339 (2017)
Electrically actuated molecular toggle switch

An electrical switch based on a tripodal platform with a cantilever arm and a nitrile group at its end has been demonstrated.

Nat. Commun. 8, 14672 (2017)
Nanotextiles: A weave of polymers

Molecular weaving has been realized via surface-templated epitaxy of crystalline coordination networks.

Nat. Commun. 8, 14422 (2017)
Anomalous Hooke's law in disordered graphene

It has been demonstrated that the stretching of a graphene flake is a nonlinear function of tension, with the scaling of the stiffness obeying a fractal power law governed by static ripples.

2D Materials 4, 011003 (2017)
Sign reversal of the Hall coefficient in 3D metamaterials

Electrical properties of a p-type semiconductor have been experimentally mimicked by a chainmail-like metamaterial made of an n-type semiconductor.

Phys. Rev. Lett. 118, 016601 (2017)
Evolving quality of frictional contact with graphene

It has been demonstrated, by atomistic simulations, that monolayer graphene exhibits higher friction, which increases with sliding, than multilayer graphene.

Nature 539, 541 (2016)
integrated generation and detection
First quantum photonic circuit with an electrically driven light source

Optical waveguide-integrated generation and detection of nonclassical light have been demonstrated with electrically driven carbon nanotubes.

Nat. Photon. 10, 727 (2016)
3d laser writing
Conductive 3D microstructures via direct laser writing

Laser-written 3D gold-containing microstructures have been fabricated by simultaneous photopolymerization and photoreduction.

Adv. Mater. 28, 3592 (2016)
atomic switch
Atomic scale plasmonic switch

An electrically controlled switch which operates by means of relocation of an individual atom in a plasmonic cavity has been demonstrated.

Nano Lett. 16, 709 (2016)
SF thermoelectric
Thermoelectric currents in SF tunnel junctions in high magnetic fields

Spin-dependent thermoelectric currents have been observed in superconductor-ferromagnet tunnel junctions in high magnetic fields, probing the coupling of spin and heat transport in superconductors.

Phys. Rev. Lett. 116, 097001 (2016)
lipid membrane
Self-limiting assembly of lipid membranes on graphene sensor arrays

Phospholipid membranes of different functionalities have been simultaneously assembled on arrays of graphene surfaces using multi-pen lipid dip-pen nanolithography.

Nanoscale 8, 15147 (2016)
Mechanisms of nanoglass ultrastability

A mechanism has been proposed for the existence of stable amorphous grains and interfacial regions the atomic structure and  internal energy of which differ from those of the melt-quenched glass.

ACS Nano 10, 3241 (2016)
quantum einstein-de haas
Quantum Einstein-de Haas effect

The Einstein–de Haas effect at the quantum level has been demonstrated using a single-molecule magnet attached to a carbon nanotube mechanical nanoresonator.

Nat. Commun. 7, 11443 (2016)
nitrogen-rich carbon
Novel nanocomposites for Li-ion batteries

Nitrogen-rich carbon made by hard templating and atomic-layer deposition has been demonstrated to be a versatile host material for long-life high-performance lithium-based batteries.

ACS Appl. Mater. Interface 8, 10274 (2016)
Towards on-chip communication with carbon nanotubes

Electrically driven nanotubes can be forced to emit light with a specific color by integration into a photonic crystal waveguide.

Nat. Photon. 10, 420 (2016)
printed oxide electronics
Towards room-temperature processing of printed high-performance oxide electronics

Solution-processed high-performance MOSFETs and CMOS inverters have been obtained entirely at room temperature without an additional curing step.

ACS Nano 9, 3075 (2015)
short-channel CN transistor
Carbon nanotubes for high-density short-channel transistors

Best performing short-channel transistors have been built by using highly enriched semiconducting single-wall CNs prepared by combining polymer-wrapping with size-exclusion chromatography.

ACS Nano 10, 1888 (2016)
Large-area polymer-free CNT solar cells

Carbon nanotube / fullerene solar cells have been obtained with record high active area.

Adv. Energy Mater. 2015, 1501345
Gas evolution in operating lithium-ion batteries

Gassing in battery pouch cells has been directly observed using neutron imaging, with special emphasis put on the high-voltage LiNi0.5Mn1.5O4/graphite system.

Sci. Rep. 5, 15627 (2015)
Chemie steuert Magnetismus
Intercalation-Driven Reversible Control of Magnetism in Bulk Ferromagnets

An extension in magnetoelectric effects is proposed to include reversible chemistry-controlled magnetization variations.

KIT Press Release in German
Scheme of L-DPN
Modelling of L-DPN:

"A diffusive ink transport model for lipid dip-pen nanolithography" by Urtizberea and Hirtz in Nanoscale 7 (2015) 15618-15634

Self-Assembly of a Giant Tetrahedral 3 d–4 f Single-Molecule Magnet within a Polyoxometalate System
Self-Assembly of a Giant Single-Molecule Magnet

We synthesized a giant tetrahedral heterometallic polyoxometalate (POM)-based single molecule magnet which contains the largest number of 4f ions and is the first to incorporate two different 3d–4f and 4f coordination cluster assemblies within same POM framework.

Angewandte Chemie, 22 Sep 2015
Integrated all-photonic non-volatile multi-level memory
Integrated all-photonic non-volatile memory

Robust, non-volatile, all-photonic integrated memory chips based on phase-change materials are demonstrated at switching speeds approaching 1GHz.

KIT Press Release
Partial Figure 2: Bennett resonance of a Na cylindrical nanowire of radius R=2 nm
Self-consistent hydrodynamic description of metals in nanoplasmonics

To properly describe the properties of metals used in nanoplasmonic devices in truly nanometric systems, we develop and apply for the first time a self-consistent hydrodynamic description.

Nature Communications 6, May 2015
Diamond Nanophotonic Circuits
Diamond Nanophotonic Circuits Functionalized by Dip-pen Nanolithography

Microrings are prepared lithographically from diamond thin films, then coupled to photonic bus waveguides for on-chip readout.

Advanced Optical Materials 3, March 2015
Electronically Sorted DWCNTs

Building on our previous work we show that chromatography techniques can be used to prepare DWCNTs with either metallic or semiconducting outer walls.

ACS Nano, March 2015, DOI: 10.1021/nn506869h
Thermally tunable self-assembled metamaterial
Thermally tunable self-assembled metamaterial

We show that the spatial arrangement of metallic nanoparticles embedded in a thermally responsive organic material can be substantially modified as a function of the temperature. This in turn strongly influences the optical properties of the entire metamaterial. 

Nature Communications 6, March 2015
Interfacial dominated ferromagnetism
Interfacial dominated ferromagnetism in nanograined ZnO: a μSR and DFT study

Using low energy muon spin relaxation in combination with SQUID and TEM techniques, we demonstrate that the magnetic volume fraction is strongly related to the sample volume fraction occupied by
grain boundaries.

Scientific Reports 5, March 2015
Size-Dependent Oxidation of Monodisperse Silicon Nanocrystals with Allylphenylsulfide Surfaces
Size-Dependent Oxidation of Monodisperse Silicon Nanocrystals with Allylphenylsulfide Surfaces

We are able to boost the photoluminescence quantum yield of colloidal dispersions of silicon nanocrystals capped with allylphenylsulfide.

Small, 2015, 11(3)
Structural evolution of ruthenium clusters

A combination of trapped ion electron diffraction measurements and DFT computations reveal the structural evolution of small ruthenium clusters in the size range of n=4-20.

J. Chem.Phys. 142, 024319, 2015
Scheme of Lithography Process
Beam Pen Lithography:

"Apertureless Cantilever-Free Pen Arrays for Scanning Photochemical Printing" by Zhou et al. in Small 11 (2015) 913-918

Characterisation and application of ultra-high spin clusters as magnetic resonance relaxation agents
Characterisation and application of ultra-high spin clusters as magnetic resonance relaxation agents

We report on the use of highly paramagnetic isostructural FeIII/4f coordination clusters with a [Fe10Ln10] core to enhance relaxation. The Fe10Gd10 cluster adheres to the surface of the biofilm better than the commercial agent Gadovist.

Dalton Trans., 2015
Dip-Pen Nanolithography-Assisted Protein Crystallization
Dip-Pen Nanolithography-Assisted Protein Crystallization

We demonstrate the use of DPN in directing and inducing protein crystallization on specific surface locations.

J. Am. Chem. Soc., 2015
Reactive Superhydrophobic Surface
Patterning on Superhydrophobic Surfaces

Our PAINTS surfaces show superhydrophobicity and can be conveniently functionalized with the photoclick thiol-ene reaction. PAINTS bearing vinyl groups can be easily modified with disulfides under UV irradiation.

Nano Lett. 15 (2015) 675–681
False colour scanning electron microscope (SEM)-micrographs of a fabricated electro-optomechanical device.
Diamond electro-optomechanical resonators integrated in nanophotonic circuits

Featured on the cover of APL. We demonstrate that our circuits can excite higher order mechanical resonances up to 115 MHz both in vacuum and under ambient conditions.

Appl. Phys. Lett. 105, 251102 (2014)
News mica
Persistent hysteresis in graphene-mica van der Waals heterostructures

We have designed and studied van der Waals heterostructures based on graphene, mica and hexagonal boron nitride and show that hysteretic behavior can be very strong and persists even at millikelvin temperatures.

Nanotechnology 26, 015202 (2015)
With growing interactions the oscillation period increases until it diverges at an interaction strength approximately equal to the bandwidth.
Signature of the Dirac cone in the properties of linear oligoacenes

Here we show that, contrary to widely held belief, the magnitudes of excitation gaps do not always decay monotonously with N, but can oscillate due to the presence of a ‘Dirac cone’ in the band structure.

Nature Communications, September, 2014
Unraveling the Influence of Lanthanide Ions on Intra and Inter-Molecular Electronic Processes in Fe10Ln10 Nano-Toruses

Advancing the current understanding of molecular spintronics, we use femtosecond absorption spectroscopy to show that the intramolecular electronic channels follow a three-step process.

Advanced Functional Materials (2014) DOI: 10.1002/adfm.201400336
Photocurrent Spectroscopy of Solution Processed SWCNTs

We demonstrate the use of variable-wavelength photocurrent microscopy and photocurrent spectroscopy to study the photoresponse of (n, m) sorted SWNT devices. 

ACS Nano (2014) DOI: 10.1021/nn503278d
Scheme of Antibodies interacting with Lipid Membranes
Antibody Lipid Interaction:

"HIV-1 antibodies and vaccine antigen selectively interact with lipid domains" by Hardy et al. in Biochim. Biophys. Acta 1838 (2014) 2662-2669 

mechanical invisibility cloak diagram forces
An elasto-mechanical unfeelability cloak made of pentamode metamaterials

KIT researchers have created the first mechanical invisibility cloak. When placed over an object, the object cannot be felt at all — either by a finger, or a more sensitive measuring device.

Nature Communications June 2014

Press Release in German
KIT Forscher bauen optische Tarnkappe für Nebel
Invisibility cloaking in a diffusive light scattering medium Researchers at the KIT have developed a cloak that is broadband, omnidirectional, and big enough to hide a macroscopic object. The new cloak works  in foggy or "diffusive" conditions.

Press Release in German
Science 2014 image
Electrically driven nuclear spin resonance in single-molecule magnets A recent publication in Science shows how coherent single nuclear-spin manipulation using electric fields only can be achieved. This quantum-mechanical process is present in all nuclear spin systems and uses of the hyperfine Stark effect as a magnetic field transducer at the atomic level. Science June 2014
Preparation of Purified DWCNTs

We demonstrate a new method utilising gel chromatography to separate double walled carbon nanotubes from the as prepared raw material containing single- and double- walled nanotubes. 

ACS Nano (2014) DOI: 10.1021/nn500756a
Carbon Nanotube Film Metallicity in Solar Cells

We provide a comparison between carbon nanotube - silicon solar cells fabricated with either semiconducting, metallic or mixed nanotubes.

Physica Status Solidi A (2014) DOI: 10.1002/pssa.201431403
We demonstrate how light from an electrically driven carbon nanotube can be coupled directly into a photonic waveguide architecture

Waferscale, broadband sources are realized integrated with nanophotonic circuits allowing for propagation of light over centimeter distances.

[Advanced Materials]
Ordered mesoporous thin film ferroelectrics
Ordered mesoporous thin film ferroelectrics Reitz et al. report in this paper that cubic mesoporous lead zirconate titanate (PZT) thin films with both a high degree of biaxial texturing and good ferroelectric properties can be produced by facile coassembly strategies.  Chem. Mater., 2014, 26, 2195–2202
arge-pore mesoporous Ho3Fe5O12 thin films with out-of-plane magnetic easy axis
Large-pore mesoporous Ho3Fe5O12 thin films with out-of-plane magnetic easy axis Preference for room-temperature out-of-plane magnetic alignment in solution-processed mesostructured thin films is unique, as reported by Suchomski et al.
Chem. Mater., 2014, 26, 2337–2343
Micro-Spotting with Quill-Like Pens

"Click-Chemistry Based Multi-Component Microarrays by Quill-Like Pens" by Hirtz et al. in Adv. Mater. Interfaces 1 (2014) 1300129

flouride battery
New fluoride ion battery working at room-temperature This work reports a novel liquid electrolyte based on a fluoride-doped polymer matrix, which was developed for anion transportation.  Royal Society of Chemistry
ACOM-STEM image of ncNi with deformation processes overlaid
Untangling dislocation and grain boundary mediated plasticity in nanocrystalline Nickel J. Lohmiller, M. Grewer, C. Braun, A. Kobler, C. Kübel, V. Honkimäki, O. Kraft, R. Birringer, P.A. Gruber, Acta Mat., 2014, 65, 295-307. Additional information
Broadband terahertz generation from metamaterials
Broadband terahertz generation from metamaterials Researchers demonstrate broadband terahertz (THz) wave generation using metamaterials. Nature Communications
Automated Preparation of (n,m) Pure SWCNTs With the use of a Gel Permeation Chromatography system we demonstrate the simple, scalable and automated separation of (n,m) pure s-SWCNTs. ACS Nano 8 (2014) 1817-1826
Charge distribution of CNT-graphene junctions

Here we have studied the equilibrium distance of armchair carbon nanotube-graphene junctions as a function of the nanotube diameter and the electrostatic influence of the nanotube on the graphene sheet. 

New Journal of Physics Jan. 2014
ZRS phase diagram
Emergence of Domains and Nonlinear Transport in the Zero-Resistance State

We study transport in the domain state, the so-called zero-resistance state, that emerges in a two-dimensional electron system in which the combined action of microwave radiation and magnetic field produces a negative absolute conductivity... Read more in:

I. A. Dmitriev et al, Phys. Rev. Lett. 111, 206801 (2013)
Gold-coated AFM tip
Nanotechnology Cover

"Enhancing Raman signals with an interferometrically controlled AFM tip" got on the cover of Nanotechnology magazine.

[ Nanotechnology ]
Picture of
Giant Magnetodrag in Graphene at Charge Neutrality

We report experimental data and theoretical analysis of Coulomb drag between two closely positioned graphene monolayers in a weak magnetic field. Close enough to the neutrality point, the coexistence of electrons and holes in each layer leads to a dramatic increase of the drag resistivity... Read more in:

M. Titov et al, Phys. Rev. Lett. 111, 166601 (2013)
L-DPN on Graphene
Lipid Membranes on Graphene: "Multiplexed biomimetic lipid membranes on graphene by dip-pen nanolithography"

by Hirtz et al. in Nat. Commun. 4 (2013) 2591 

Dynamic electron transport in 3D nanographene
Dynamic electronic transport in 3D nanographene

Dynamic control over electronic transport is shown in ultra-high surface area graphene based bulk materials. The large macroscopic conductance of the nanographene monoliths can be varied up to several hundred percent with electrolyte-gating; paving ways towards carbon based bulk transistors.

Advanced Materials 2012
cover small
Pyridine-containing copolymer does the job! and enables easy and efficient sorting of large diameter semiconducting SWNTs.
Learn more...
Switching the spin state of a coupled spin-pair

The spin state of a coupled spin-system can be switched electronically.

Nat. Nanotechnol. 2013
Ir(ppy)3 as quantum transducer
Ir(ppy)3 as Quantum Transducer for Plasmon Generation

Controlling light at the nanoscale by electrical fields requires objects, in which electro-magnetic properties are responsive to gating fields. In two recent publications it was shown that molecules fulfil this requirement and act as such quantum transducers. This article was presented as research highlight in Nature Photonics.
Nano Letters 2013

Nano Letters 2014
Oxygen affinity of iron porphyrin molecules revealed

Using gas-phase ion chemistry the binding energy of molecular oxygen and carbon monoxide to heme analogue iron(II)porphyrin anions has been determined.

For more information see: Angew. Chem. Int. Ed. 52(39), 10374 (2013)

TOC Image
Nanoporous Polymer for Spotting:
"Porous polymer coatings as substrates for the formation of high-fidelity micropatterns by quill-like pens"
by Hirtz et al. in Beilstein J. Nanotechnol. 4 (2013) 377-384

test news
Modulation of the selectivity of Schiff base formation in mixtures of two NH2 compounds and one aldehyde or of two aldehydes and one amine

A.-M. Stadler, Israel J. Chem., 2013, 53, 113-121.

Functionalized Goblet Structure
Whispering Gallery Mode Sensors:
On-chip microlasers for biomolecular detection via highly localized deposition of a multifunctional phospholipid ink by Bog et al.  More...
Lab Chip 13 (2013) 2701-2707
Quantum Dot-Resonator Laser
Quantum Dot-Resonator Lasing Circuit

We study the noise properties of the transport current in the lasing regime of a double quantum dot-resonator circuit.

New J. Phys. 15, 025044 (2013)
Spin-phonon coupling in a single-molecule resonator


A single TbPc2 molecule and a carbon nanotube interact electro-mechanically as quantum objects.

Nature News and Views by Richard Winpenny.

Nat. Nanotechnol. 2013
Nanoparticle etching a tunnel into graphite
Nanoparticles digging the world's smallest tunnels


Nickel nanoparticles are used to etch world's smallest tunnels into graphite.

[Nanowerk] [F.A.Z.]

Nature Communications 4 (2012) 1379
Plasmons in Molecules

We show that the concept of plasmons is still applicable for extended molecular systems and demonstrate that the proposed scaling approach provides an easy way of characterizing electronic excitations.

Read more
Nature Communications Our paper on waveguide single photon detectors is published by Nature Communications. Press Release.
Large shape-persistent metal-invertible 15-Nsp2-donor-atom macrocycles functioning as trinucleating ligands

A.-M. Stadler, J.-J. Jiang, H.-P. Wang, C. Bailly, Chem. Commun., 2013, 49, 3784-3786 

Graphene microwave transistors on hexagonal boron nitride substrates driven by graphene nanoribbon backgates

Our new paper shows the possibilities of using graphene nanoribbons back-gates in microwave graphene field effect transistors on hexagonal boron nitride substrates.

Appl. Phys. Lett. 102
Spin transport in superconductor hybrid structures
Long-range spin transport in nanoscale superconductors

In nanoscale superconductors with a Zeeman splitting, spin-polarized quasiparticles can be transported over suprisingly long distances. Read more in Hübler et al., Phys. Rev. Lett. 109, 207001 (2012)

Signature of the Dirac cone in the properties of linear oligoacenes

Here we show that, contrary to widely held belief, the magnitudes of excitation gaps do not always decay monotonously with N, but can oscillate due to the presence of a ‘Dirac cone’ in the band structure.

Read more
(Bio)functional Nanostructured Surfaces

 Pattern formation of the nanometer scale by self-organization. An example for biofunctional films is shown.

MEC in Fe island
Dynamics of Electrically Driven Martensitic Phase Transitions in Fe Nanoislands

We studied the dynamics and energetics of the martensitic phase transition in the electric field on the nanometer scale.

Phys. Rev. Lett. 111, 167601 (2013)

Small Ti clusters for catalysis of hydrogen exchange in NaAlH4
Paper awarded

Our paper "Small Ti clusters for catalysis of hydrogen exchange in NaAlH4" from 2003 in Nanotechnology has recently been awarded as one of the TOP 25 papers of the journal of the last 25 years.

Graphene inside an optical cavity
Graphene in a cavity

A sheet of graphene inside an optical cavity shows spectrally confined thermal emission.

[KIT press] [Physik in unserer Zeit]

Nature Communications 3 (2012) 906
Image of pentamode material
New material class realized

KIT Researchers Succeed in Realizing a New Material Class.

Press release
Double QD Fluctuation Theorem
Irreversibilty in SE-Tunneling

We present a low-temperature experimental test of the fluctuation theorem for electron transport through a double quantum dot. The rare entropy-consuming system trajectories where single charges flow against the source-drain bias appear with a frequency that agrees with the theoretical predictions. 

Phys. Rev. X 2, 011001 (2012)
Nanocontact Printing and AFM Nanolithography

Nanoanalytics and nanolithography via AFM. Functional chemical patterns on surfaces can be written and subsequently imaged with the same AFM tip. 

Optomechanical Memory

Our new paper in Nature Nanotechnology describes the realization of a non-volatile memory element driven by opto-mechanical interactions.

Learn More...
Single molecule GMR

We measured the giant magnetoresistance of single Hydrogen-Phtalocyanine molecules of about 60%. This value is extremely large in view of the fact that they do not contain any magnetic atoms.

Nature Nanotechnology 6 (2011) 185-189


Surface-confined molecular motors.
Surface-confined molecular motors

 The self-assembly of surface-confined molecular motors from simple molecular building blocks was reported in the Proceedings of the National Academy of Sciences (in collaboration with J.V. Barth, TU München).

PNAS 2010
The Single-Atom Transistor

 The Atomic Transistor. The controlled repositioning of one single silver atom allows for the reversible opening and closing of an electronic circuit.