Imaging Cyclotron Orbits of Electrons in Graphene
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CitationBhandari, 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.
AbstractElectrons 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.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:34221824
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