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• W2038355993 abstract "Electron reflection at an interface is a fundamental quantum transport phenomenon. The most famous electron reflection is the electron→hole Andreev reflection (AR) at a metal/superconductor interface. While AR can be either specular or retro-type, electron→electron reflection is limited to only the specular type. Here we show that electrons can undergo retro-reflection in bilayer graphene (BLG). The underlying mechanism for this previously unknown process is the anisotropic constant energy band contour of BLG. The electron group velocity is fully reversed upon reflection, causing electrons to be retro-reflected. Utilizing a BLG/superconductor junction (BLG/S) as a model structure, we show that the unique low energy quasiparticle nature of BLG results in two striking features: (1) AR is completely absent, making BLG/S 100% electron reflective; (2) electrons are valley-selectively focused upon retro-reflection. Our results suggest that BLG/S is a valley-selective Veselago electron focusing mirror which can be useful in valleytronic applications." @default.
• W2038355993 created "2016-06-24" @default.
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• W2038355993 date "2012-12-21" @default.
• W2038355993 modified "2023-09-24" @default.
• W2038355993 title "Retro reflection of electrons at the interface of bilayer graphene and superconductor" @default.
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• W2038355993 doi "https://doi.org/10.1038/srep01013" @default.
• W2038355993 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3527828" @default.
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