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By Dr. Roshan Krishna Kumar\, Catalan Ins titute of Nanoscience and Nanotechnology (ICN2)\, Catalonia\, Spain.
\nAbstract: \;T he conversion of light into electrical signals is one of the most fundamen tal phenomena underlying modern technologies. As emerging fields such as q uantum technologies\, artificial intelligence\, and space exploration cont inue to advance\, there is a growing need for fundamentally new photonic h ardware. This requires new material discovery\, improved understanding of photocurrent responses and engineering solutions to create real-world devi ces. 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 photo detectors. I will then show how these quantum optoelectronic effects provi de new insights into the exotic correlated phases of matter found in moir é materials\, including states relevant to topological quantum computing. Finally\, I will introduce non-equilibrium electronic phases in moiré su perlattices as a route towards ultrasensitive photodetection\, highlightin g a new platform for single-photon detectors with wavelength and operating -temperature capabilities that extend beyond those of conventional superco nducting technologies.
\nShort bio: Dr. Roshan Kris hna Kumar is a Ramón y Cajal Fellow at the Institut Català de Nanociènc ia i Nanotecnologia (ICN2)\, where he leads a research program on terahert z 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 transpo rt in graphene and moiré superlattices. Following an EPSRC postdoctoral f ellowship at the University of Manchester\, he joined ICFO as a Marie Skł odowska-Curie Fellow\, where he led the FLAG-ERA PhotoTBG project developi ng quantum photonic devices based on moiré superlattices. His research co mbines quantum transport and photocurrent measurements to explore novel lo w-dimensional materials\, with the aim of developing next-generation photo nic and quantum technologies.
\nHosted by Pr of. Pablo Ordejón\, CSIC Research Professor\, Group Leader and Director \; at ICN2.
\nIn-Person and \;Online Event \;(Link \;here)
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DTSTART:20260729T083000 DTEND:20260729T215959 LOCATION:ICN2 Seminar Room and Online CATEGORIES:ICN2 Seminars END:VEVENT END:VCALENDAR