Optical spectroscopy

The emergence of ordered states in interacting electron systems through symmetry breaking phase transitions are a corner stone of contemporary condensed matter physics. The recent discovery of symmetry protected topological states of matter has uncovered a completely new paradigm to realise ordered states of matter.

My research focusses on the interface between these two fundamental principles where new functional materials for future technological advances are waiting to be discovered.

Funding

Our research is funded through the Netherlands Organisation for Scientific Research (NWO) and the foundation for fundamental research on matter (FOM). We also obtain funding by the EU through the BESSYII and SLS lightsources.

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Past funding

In the past I have also obtained funding from ICAM-I2CAM and the NSF.

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News

Optical properties of SmB6 revisited

Despite a large global search, combining strong correlations and electronic topological twists in one material has so far been limited to the discovery of a single material: the Kondo insulator SmB6. We present new insights on the formation of the Kondo insulating state in our latest publication.

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Highlights

Visualizing the MIT in V2O3
Visualizing the MIT in V<sub>2</sub>O<sub>3</sub>

Despite 60 years of research, the metal-to-insulator transition in complex oxide materials still holds some mysteries. In a study published in Nature Physics, we show that the electronic transition in V2O3 evolves in real space by forming intertwined `mazes' of insulating and metallic patches.

Fermi liquid like ground state in the iron-pnictides
Fermi liquid like ground state in the iron-pnictides

There are two key ingredients necessary to gain further understanding of high-temperature superconductivity. The first is the identification of the pairing interaction and the second a correct description of the normal state from which superconductivity emerges. Our optical experiments show that the normal state of a carefully annealed, electron-doped iron-pnictide superconductor is well described by Fermi liquid theory.

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