Quantum Nano-Optoelectronics

The Quantum Nano-Optoelectronics Group, led by Prof. Koppens, is at the forefront of researching the fundamental science and potential applications of two-dimensional (2D) materials, focusing particularly on their interactions with light at extreme limits and at the nanoscale. The group integrates the realms of nanophotonics, 2D materials, topology, emerging phenomena, and strong light-matter interactions, creating a multidisciplinary approach in their research.

A key aspect of this research is the exploration of a wide array of novel materials that are a mere atom thick, such as graphene and other 2D materials. These materials are remarkable for their unique properties. By layering and manipulating these materials, like building with atomic Lego, we can engineer entirely new material systems and properties. An exciting instance of this is the creation of superconducting materials by stacking graphene layers and rotating them slightly, as demonstrated with a twist of just 1.1 degrees.

The group employs a variety of innovative techniques to study the nano-optoelectronic properties, utilizing imaging methods that operate with infrared and terahertz light. This includes pioneering low-temperature near-field imaging techniques, which allow us to examine the electronic response to light with unprecedented nanometer-scale spatial resolution. One of our key interests is to unveil the interplay of topological and many-body phenomena in 2D-material heterostructures.

Another research direction involves the confinement and control of light at the nanoscale. By studying a wide range of polaritonic modes in 2D materials, we can confine light to the atomic scale, providing a magnifying glass to study light-matter interactions at the nanoscale. Moreover, the vacuum quantum electromagnetic fields (QED) can be used to modify material properties and potentially even lead to new states of matter. Our materials-QED approach uniquely manipulates materials by facilitating their interaction with light within optical nanocavities at the nanoscale.

Beyond advancing scientific knowledge, our group is pioneering new quantum technologies, including single-photon detection and quantum molecular sensing. Our goal is to develop prototypes of these groundbreaking technologies in collaboration with industry partners, paving the way for revolutionary applications in the field.

**We are hiring: Positions at Master-thesis, PhD- and Postdoctoral level available on:

• Materials quantum electrodynamics (QED)with nanophotonic cavities
• "Twisted 2D material opto-electronics"project
• Quantum technologies such as single photon and Thz detectors with moiré material

Please contact Prof. Dr. Frank Koppens for further information.