Imaging Cyclotron Orbits of Electrons in Graphene
SCIE
SCOPUS
- Title
- Imaging Cyclotron Orbits of Electrons in Graphene
- Authors
- Bhandari, Sagar; Lee, Gil-Ho; Klales, Anna; Watanabe, Kenji; Taniguchi, Takashi; Heller, Eric; Kim, Philip; Westervelt, Robert M.
- Date Issued
- 2016-03
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Electrons 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/39288
- DOI
- 10.1021/ACS.NANOLETT.5B04609
- ISSN
- 1530-6984
- Article Type
- Article
- Citation
- NANO LETTERS, vol. 16, no. 3, page. 1690 - 1694, 2016-03
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