Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime - Condensed Matter Mesoscale and Nanoscale PhysicsReportar como inadecuado




Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime - Condensed Matter Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We analyze cotunneling transport through two quantum dots in series weaklycoupled to external ferromagnetic leads. In the Coulomb blockade regime theelectric current flows due to third-order tunneling, while the second-ordersingle-barrier processes have indirect impact on the current by changing theoccupation probabilities of the double dot system. We predict a zero-biasmaximum in the differential conductance, whose magnitude is conditioned by thevalue of the inter-dot Coulomb interaction. This maximum is present in bothmagnetic configurations of the system and results from asymmetry in cotunnelingthrough different virtual states. Furthermore, we show that tunnelmagnetoresistance exhibits a distinctively different behavior depending ontemperature, being rather independent of the value of inter-dot correlation.Moreover, we find negative TMR in some range of the bias voltage.



Autor: I. Weymann

Fuente: https://arxiv.org/







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