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Spin-polarized Specular Andreev Reflections in Altermagnets
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We show theoretically that specular Andreev reflection occurs stably at altermagnet--superconductor interfaces, which is a phenomenon that has previously been predicted only in a limited range of materials, such as Dirac/Weyl materials with fine-tuned chemical potentials. Furthermore, the characteristic spin-split bands of the altermagnet lead to a distinctive spin polarization in the specular Andreev reflections. By utilizing this feature, we propose a device that integrates the functions of both a Cooper pair splitter and a spin beam splitter, thereby creating energy-entangled electron pairs. The positive nonlocal conductance and the positive noise cross-correlation are unambiguous signatures of specular Andreev reflections in the proposed device.
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Cited by 2 Pith papers
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Majorana flat bands and anomalous proximity effects in $p$-wave magnet--superconductor hybrid systems
A two-dimensional hybrid of an s-wave superconductor and a p-wave magnet hosts chiral-symmetry-protected flat-band Majorana bound states and a disorder-robust quantized zero-bias conductance peak.
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Orientation-dependent transport in junctions formed by $d$-wave altermagnets and $d$-wave superconductors
In d-wave superconductor/altermagnet junctions, the altermagnet symmetry governs the formation of de Gennes-Saint-James bound states and the appearance of first-order Josephson coupling.
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