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- W2159762461 abstract "Using the closed-time path-integral approach, we nonperturbatively study inelastic tunneling of electrons via magnetic impurities in the barrier accompanied by phonon emission in a magnetic tunnel junction. The spectrum density of phonon emission is found to show a power-law infrared singularity $ensuremath{sim}{ensuremath{omega}}^{ensuremath{-}(1ensuremath{-}g)}$ with $g$ the dimensionless electron-phonon coupling. As a consequence, the tunneling conductance $G(V)$ increases with bias voltage $ensuremath{mid}Vensuremath{mid}$ as $G(V)ensuremath{-}G(0)ensuremath{sim}{ensuremath{mid}Vensuremath{mid}}^{2g}$, exhibiting a discontinuity in slope at $V=0$ for $gensuremath{leqslant}0.5$. This theory can reproduce both cusplike and noncusplike features of the zero-bias anomaly of tunneling resistance and magnetoresistance widely observed in experiments." @default.
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- W2159762461 date "2004-09-22" @default.
- W2159762461 modified "2023-10-16" @default.
- W2159762461 title "Theory of the zero-bias anomaly in magnetic tunnel junctions: Inelastic tunneling via impurities" @default.
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- W2159762461 doi "https://doi.org/10.1103/physrevb.70.094416" @default.
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