Bhandari, SagarLee, Gil-HoKlales, AnnaWatanabe, KenjiTaniguchi, TakashiHeller, EricKim, PhilipWestervelt, Robert2017-10-162016Bhandari, Sagar, Gil-Ho Lee, Anna Klales, Kenji Watanabe, Takashi Taniguchi, Eric Heller, Philip Kim, and Robert M. Westervelt. 2016. “Imaging Cyclotron Orbits of Electrons in Graphene.” Nano Letters 16 (3) (March 9): 1690–1694. doi:10.1021/acs.nanolett.5b04609.1530-6984http://nrs.harvard.edu/urn-3:HUL.InstRepos:34221824Electrons in graphene can travel for several microns without scattering at low temperatures, and their motion becomes ballistic, following classical trajectories. When a magnetic field B is applied perpendicular to the plane, electrons follow cyclotron orbits. Magnetic focusing occurs when electrons injected from one narrow contact focus onto a second contact located an integer number of cyclotron diameters away. By tuning the magnetic field B and electron density n in the graphene layer, we observe magnetic focusing peaks. We use a cooled scanning gate microscope to image cyclotron trajectories in graphene at 4.2 K. The tip creates a local change in density that casts a shadow by deflecting electrons flowing nearby; an image of flow can be obtained by measuring the transmission between contacts as the tip is raster scanned across the sample. On the first magnetic focusing peak, we image a cyclotron orbit that extends from one contact to the other. In addition, we study the geometry of orbits deflected into the second point contact by the tip.en-USGrapheneimage cyclotron orbitsmagnetic focusingscanning gate microscopeJournal Article2017-10-1610.1021/acs.nanolett.5b04609