Coherent Jetting behind a gate-defined Channel in Bilayer Graphene

Aitor Garcia-Ruiz; Angelika Knothe; Annika Kurzmann; Carolin Gold; Kenji Watanabe; Klaus Ensslin; Takashi Taniguchi; Thomas Ihn; Vladimir Fal'ko

Coherent Jetting behind a gate-defined Channel in Bilayer Graphene

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arxiv 2008.09145 v1 pith:3Q7CYOA3 submitted 2020-08-20 cond-mat.mes-hall

Coherent Jetting behind a gate-defined Channel in Bilayer Graphene

Carolin Gold , Angelika Knothe , Annika Kurzmann , Aitor Garcia-Ruiz , Kenji Watanabe , Takashi Taniguchi , Vladimir Fal'ko , Klaus Ensslin

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Thomas Ihn

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keywords graphenetransportbilayerobservationcarrierchanneljetsjetting

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Graphene has evolved as a platform for quantum transport that can compete with the best and cleanest semiconductor systems. Recently, many interesting local properties of carrier transport in graphene have been investigated by various scanning probe techniques. Here, we report on the observation of distinct electronic jets emanating from a narrow split-gate defined channel in bilayer graphene. We find that these jets, which are visible via their interference patterns, occur predominantly with an angle of 60{\deg} between each other. This observation is related to the specific bandstructure of bilayer graphene, in particular trigonal warping, which leads to a valley-dependent selection of momenta for low-energy conduction channels. This experimental observation of electron jetting has consequences for carrier transport in graphene in general as well as for devices relying on ballistic and valley selective transport.

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Probing Cooper pair momentum by quasiparticle steering with planar Josephson junctions
cond-mat.mes-hall 2026-07 accept novelty 6.0

Quasiparticles eject from ballistic planar Josephson junctions at a phase-controlled angle scaling as √(Δ/μ), providing a kinematic probe of condensate momentum transfer.