HYBRID EVENT - REGISTER HERE to attend
By Dr. Roshan Krishna Kumar, Catalan Institute of Nanoscience and Nanotechnology (ICN2), Catalonia, Spain.
Abstract: The conversion of light into electrical signals is one of the most fundamental phenomena underlying modern technologies. As emerging fields such as quantum technologies, artificial intelligence, and space exploration continue to advance, there is a growing need for fundamentally new photonic hardware. This requires new material discovery, improved understanding of photocurrent responses and engineering solutions to create real-world devices. This talk will present our efforts to develop next-generation quantum materials for optoelectronic devices using the highly tunable platform of two-dimensional moiré superlattices. I will first discuss unconventional optoelectronic responses arising from the quantum geometry of electronic wavefunctions and demonstrate how they enable polarization-sensitive photodetectors. I will then show how these quantum optoelectronic effects provide new insights into the exotic correlated phases of matter found in moiré materials, including states relevant to topological quantum computing. Finally, I will introduce non-equilibrium electronic phases in moiré superlattices as a route towards ultrasensitive photodetection, highlighting a new platform for single-photon detectors with wavelength and operating-temperature capabilities that extend beyond those of conventional superconducting technologies.
Short bio: Dr. Roshan Krishna Kumar is a Ramón y Cajal Fellow at the Institut Català de Nanociència i Nanotecnologia (ICN2), where he leads a research program on terahertz spectroscopy and quantum photonic technologies based on two-dimensional moiré materials. He received his PhD in Condensed Matter Physics from the Universities of Manchester and Lancaster, investigating electron transport in graphene and moiré superlattices. Following an EPSRC postdoctoral fellowship at the University of Manchester, he joined ICFO as a Marie Skłodowska-Curie Fellow, where he led the FLAG-ERA PhotoTBG project developing quantum photonic devices based on moiré superlattices. His research combines quantum transport and photocurrent measurements to explore novel low-dimensional materials, with the aim of developing next-generation photonic and quantum technologies.
Hosted by Prof. Pablo Ordejón, CSIC Research Professor, Group Leader and Director at ICN2.
In-Person and Online Event (Link here)