Graphene team

Welcome to the website of Romain Danneau's Research Group focused on the "Electronic Properties of Graphene," one of the topics researched in Carbon-based Nanostructures at the Institute of Nanotechnology (INT) at the Karlsruhe Institute of Technology.


From left to right: Muraleetharan Boopathi, Rainer Kraft, Saumya Gupta, Victoria Martinez Daruich, Marco Angelo Giambra, Fan Wu, Nicolas Kurz, Jens Mohrmann, Nicolai Walter, Renjun Du, Romain Danneau, Chirojyoti Rava.


Graphene is a single layer of carbon atoms packed in a honeycomb lattice. At low energy, the dispersion relation is linear. Such peculiarity gives rise to unique and sometime counterintuitive electronic properties.

Our group aims to study the fundamental electrical properties and the potential applications of devices based on this truly two-dimensional crystal. Our graphene devices are characterized in many different ways from room down to millikelvin temperatures. This research project was funded by "Concept for the future" of the Karlsruhe Institute of Technology within the framework of the German Excellence Initiative and now by the Helmholtz society. Our group benefits from internal as well as international collaborations (including China, Finland, France, Italy, Japan, Korea, UK, USA, …).

Christian graduation
Graduation of Christian

Congratulation to Christian who has successfully defended  his thesis on graphene microwave field effect transistors!!!

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)
Graduation Julien
Graduation of Julien

 Congratulations to Julien who successfully defended his thesis on proximity induced superconductivity in graphene nanostructures!!!

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
XNEM project started!!!

We are involved in the XNEM project within the Tempus program of EU . This project aims to design a new master degree in nanoscience in the MENA region with the support of EU partner. The involved countries are Egypt, Jordan, Tunisia, Spain, Sweden, France and Germany. 

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Light-matter interactions of graphene on silicon nitride optical circuits

In our new paper we have studied the light absorption of a graphene film probed by high-quality on-chip silicon nitride microring resonators and Mach-Zehnder interferometers.

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Our Cryo-free dilution refrigerator arrived!!!

We have received our BlueFors LD250 with a 12 T magnet. It reaches a base temperature of ~ 7 mK and its cooling power is ~ 340 microWatt at 100 mK. We have benefited from the funding of the DFG (proposal INST 121384/17-1) within its large research equipment grant  scheme.

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