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Lookup NU author(s): Dr Aleksey KozikovORCiD
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This article reports on tunable electron backscattering investigated with the biased tip of a scanning force microscope. Using a channel defined by a pair of Schottky gates, the branched electron flow of ballistic electrons injected from a quantum point contact is guided by potentials of a tunable height well below the Fermi energy. The transition from injection into an open two-dimensional electron gas to a strongly confined channel exhibits three experimentally distinct regimes: one in which branches spread unrestrictedly, one in which branches are confined but the background conductance is affected very little, and one where the branches have disappeared and the conductance is strongly modified. Classical trajectory-based simulations explain these regimes at the microscopic level. These experiments allow us to understand under which conditions branches observed in scanning gate experiments do or do not reflect the flow of electrons.
Author(s): Steinacher R, Kozikov AA, Rössler C, Reichl C, Wegscheider W, Ensslin K, Ihn T
Publication type: Article
Publication status: Published
Journal: Physical Review B
Print publication date: 15/02/2016
Online publication date: 02/02/2016
Acceptance date: 15/01/2016
ISSN (print): 2469-9950
ISSN (electronic): 2469-9969
Publisher: American Physical Society
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