MateriAlZ Seminar: Peter Jacobse
Friday, April 28th, 2023 - 11:00 a.m. (Arizona Time)
Peter H. Jacobse
Postdoctoral Researcher
University of California, Berkeley
"Building Future Nanoelectronics From Carbon, Atom by Atom"
Zoom link | Passcode: 203011
MateriAlZ Seminar website | YouTube | Twitter
Abstract:
Depending on their shape, structure and edges, graphene nanoribbons (GNRs) (narrow strips of graphene), exhibit wide-ranging electronic behavior, such as a tunable band gap, localized electronic states, and spins. GNRs can be made from the bottom up with chemical methods, involving synthesis of precursor molecules, followed by linking them together in polymer chains, and finally graphitization. In the first part of my presentation, I will show some exciting new GNRs that we have made in this way. The GNRs display new behavior, such as Kondo-chain physics, or exhibit spiral-like morphology. Playing tricks such as incorporating four-membered rings and nitrogen atoms tunes the band structure of GNRs and turns them from direct-gap to indirect-gap semiconductors. Finally, I will show how we synthesized magnetic quantum dots inside GNRs.
To have well-defined electronic properties and to be useful for real-life implementations such as field-effect transistors (FETs) and spin qubits, strategies need to be developed to control their exact length and structural sequence. In the second part of my talk, I will show how we have solved these issues by our newly developed techniques. For the first time in history, we are able to build perfect, predefined GNRs like LEGOs – one brick at a time. These strategies pave the way towards the creation of electronic devices, spintronics and qubits out of carbon.
Bio
Peter H. Jacobse (1990) grew up near the city of Groningen, The Netherlands , where he studied chemistry at the University of Groningen B.Sc. 2012, minoring in physics His curiosity in the material world persisted when he moved to Utrecht, The Netherlands M.Sc. in nanomaterials science , 2014 , cum laude. It was here where his love affair with graphene nanoribbons began, first as a master student under Ingmar Swart, and later after obtaining a grant from the Netherlands Organization for Scientific Research (NWO) as a Ph.D. candidate (degree obtained in 2018). This research was partially conducted in the organic chemistry group of Robertus J. M. Klein Gebbink and Marc Etienne Moret, meaning that Jacobse divided his time between performing research in the STM lab and doing chemistry in the fume hood. Among other achievements, Jacobse showed the first instance of negative differential resistance in bottom up synthesized GNRs acting as resonant tunneling transistors awarded the best journal article by the Dutch Vacuum Society Since 2019, Jacobse has been a Rubicon postdoctoral Fellow (fellowship awarded by the NWO) and postdoctoral researcher in the group of Michael F. Crommie at the University of California, Berkeley. Here, he continues to lead the research on the topic of graphene nanoribbons. Jacobse continues his quest to push the boundaries of carbon nanomaterials, mostly focusing on developing synthetic methodologies, exploring new physics in these materials, and finding ways to implement these materials in nanoelectronics.