Ultrafast Dynamics in Nanoscale Systems

Group Leader: Klaas-Jan Tielrooij

Main Research Lines

  • Heat and charge transport in nanoscale systems

  • Ultrafast optics and optoelectronics

  • Nonlinear optical phenomena

  • Detection and harvesting of light

  • Terahertz technologies

  • Nanofabrication of systems based on 2D materials

The main goal of the recently established (October 2018) Ultrafast Dynamics in Nanoscale Systems Group is to probe, understand and exploit ultrafast phenomena that take place at the nanoscale. These phenomena have far-reaching implications in terms of material and system properties, as well as technological applications in fields such as thermal management, light harvesting, photodetection, data communication and quantum technologies.

Currently, one of the main material systems under investigation is that of two-dimensional, layered materials and hybrid Van der Waals heterostructures. In particular, the group studies the exciting interplay between different carriers of energy and heat in these systems: photons, electrons, phonons and other (quasi-)particles.

A large effort of the research in the group takes place within the framework of the ERC Starting Grant project CUHL (Controlling Ultrafast Heat in Layered materials), which was awarded to Dr Tielrooij at the end of 2018. The group also led the BIST Ignite project 2DNanoHeat (awarded in March 2018), on heat transport in novel quantum materials, including topological insulators, which is now an ongoing collaboration between various ICN2 groups and ICFO.

During 2019, the group has been working on a project on nonlinear optics in the terahertz (THz) regime, using 2D materials. As part of this effort, the group was granted beamtime at the TELBE facility of the Helmholtz-Zentrum Dresden-Rossendorf (Germany).

Dr. Tielrooij has been involved –via ICFO– in the NanOQTech project, a European Union Horizon 2020 project funded through the FET Open programme (2016 – 2019). Its main objective was the study and design of nanoscale hybrid quantum devices that strongly couple to light. Such devices could lead to important advances in quantum communication, sensing and optoelectronics. In November 2019, this project came to a successful conclusion.

Since the group has been recently established, with the first member (David Saleta Reig) joining in February 2019, many efforts have been put into setting up the laboratory. In November, a home-built dry transfer stage became operational and a cryostat was installed.

Group Leader

Klaas-Jan Tielrooij

Junior Group Leader

Klaas-Jan Tielrooij is Junior Group Leader at the ICN2 since October 2018, heading the Ultrafast Dynamics in Nanoscale Systems group, and Visiting Professor at the Graduate School of Excellence Material Science in Mainz (Germany) since July 2018. Before joining the ICN2, he was a research fellow at the Institute of Photonic Sciences (ICFO), which is a member of the Barcelona Institute of Technology (BIST) as the ICN2. He obtained his Ph.D. at the University of Amsterdam (the Netherlands) in December 2010 with a thesis that was awarded the FOM Physics Thesis Prize 2011. He was awarded an ERC Starting Grant in 2018, and a Ramon y Cajal Fellowship in 2019. Dr Tielrooij has more than 40 peer-­reviewed publications, 13 of which in Nature and Science and family, and over 5,000 citations. His H-index is currently 27 (9 years after Ph.D.)

Read more