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Broader Impacts

Quantum Transport in High Mobility Graphene Nanoelectronic Devices : trilayer graphene Pablo Jarillo-Herrero, Massachusetts Institute of Technology, DMR 0845287.

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Broader Impacts

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  1. Quantum Transport in High Mobility Graphene Nanoelectronic Devices : trilayer graphenePablo Jarillo-Herrero, Massachusetts Institute of Technology, DMR 0845287 Charge carriers in single-layer graphene behave like massless particles, whereas those in bilayer graphene act as massive particles. In Bernal-stacked trilayer graphene (TLG), both of these massless and massive particles coexist. When these charge carriers are subjected to high magnetic field, they start to form quantized energy levels. However, these energy levels for massless and massive particles depend differently on the magnitude of magnetic field. As a result, they are expected to cross at finite magnetic field and density. In this work, we have measured for the first time these unique crossings in TLG. The position of these crossings in magnetic field and density also allows us to determine the parameters necessary in describing TLG, which will be useful in modeling TLG in future studies. (a) AFM image of a TLG Hall-bar device on hBN. (b) Bernal-stacked TLG atomic lattice. (c) Band structure of TLG within a full-parameter model. (d, f) Color map of Landau fan diagram as a function of back-gate voltage and magnetic field at 300 mK. White dashed lines are guides to the eye with filling factors labeled on the edge and the white dashed circles indicate crossing points. (e, g) Calculated density of states as a function of density and magnetic field T. Taychatanapat, K. Watanabe, T. Taniguchi, P. Jarillo-Herrero, Nature Physics7, 621-625 (2011)

  2. Quantum Transport in High Mobility Graphene Nanoelectronic DevicesPablo Jarillo-Herrero, Massachusetts Institute of Technology, DMR 0845287 • Broader Impacts • Research advisor to 8 undergraduates in the past year (2 minority and one woman) . • Research advisor to 6 PhD students (one minority and one woman) and 5 postdocs. • Featured in NOVA-PBS series “Making Stuff: Smaller”, with a demonstration of graphene fabrication and its physics. It aired last January (http://www.pbs.org/wgbh/nova/tech/making-stuff-smaller.html). • Founder and organizer of the monthly Boston Area CarbOn Nanoscience (BACON) Meetings, where students and postdocs at MIT, Harvard and BU share their research on graphene and CNT research (http://web.mit.edu/physics/cmx/bacon/). • Awarded a 2009 A.P. Sloan Fellowship, 2009 Packard Fellowship, the 2010 IUPAP Young Scientist Prize in Semiconductor Physics, and 2011 DOE Early Career Award. Top: Scenes from “Making Stuff: Smaller” feature our lab and graphene research. Bottom-left: Undergraduate researchers this year at Jarillo-Herrero Lab. Bottom-right: Opening talk at the 2011 BACON Day.

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