Theory of Andreev reflection spectroscopy with anisotropic spin-dependent scattering

• URL: http://arxiv.org/abs/2607.22747v1
• Date: Thu, 23 Jul 2026 08:49:54 GMT
• Title: Theory of Andreev reflection spectroscopy with anisotropic spin-dependent scattering
• Abstract summary: Spintronic technologies require efficient generation and control of spin-polarized currents.<n> Conventional ferromagnet-based methods suffer from sensitivity to external magnetic fields.<n>We develop a general model incorporating spin-dependent anisotropic scattering.
• Score: 2.123783767782395
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Spintronic technologies require efficient generation and control of spin-polarized currents. Conventional ferromagnet-based methods suffer from sensitivity to external magnetic fields. Andreev reflection spectroscopy is vital for measuring spin polarization and superconducting gaps, yet prevailing theories assume isotropic interface scattering. This neglects ubiquitous anisotropy in heterostructures, causing misinterpretation of material properties. To resolve this, we develop a generalized model incorporating spin-dependent anisotropic scattering. Introducing distinct interface barriers for spin-up and spin-down electrons extends both the Blonder-Tinkham-Klapwijk formalism and the Chen-Tesanovic-Chien extension. This unified framework describes transport from normal metals to half-metals. Solving the Bogoliubov-de Gennes equations with modified boundary conditions yields current formulae with a transmission probability judgment function identifying dominant spin channels. In non-magnetic metals, interfacial anisotropy generates sizable spin-polarized currents via transmission spin filtering, suppressing Andreev reflection and reducing sub-gap conductance. For positively polarized ferromagnets, anisotropy nonlinearly modulates polarization, enhancing Andreev reflection to a threshold before suppression. Negatively polarized materials exhibit inverse spectra, enabling unambiguous polarization sign determination via conductance comparisons. Epitaxial Co film measurements validate the model, resolving subtle anisotropies. This refines Andreev spectrum interpretation and supports interference-resistant spin sources using non-magnetic platforms, benefiting magnetoresistive devices and superconducting quantum technologies.

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