Spin inversion devices operating at Fano anti-resonances

Física Teórica y Materia Condensada UAM-Azcapotzalco - Avenida San Pablo 180, Código Postal 02200 México Distrito Federal, México

Corresponding authors: jlcc@correo.azc.uam.mx ppereyra@correo.azc.uam.mx

Received: 16 April 2008
Accepted: 9 June 2008

Abstract

Using the exact two-propagating-modes solutions for electrons in a quasi-2D semiconductor wave guide under sectionally constant magnetic fields and spin-orbit interactions, it is explicitly shown that the Fano-like resonances and antiresonances lead to sudden suppressions and enhancements of the spin-dependent transmission probabilities. Our calculations show that when the magnetic-field-tilting angle is increased, the spin-field interaction becomes the most significant mechanism for the spin transitions in magnetic superlattices. Taking advantage of these spin-transport effects, simple and efficient spin-inverter devices are proposed. To better visualize the relative influence of the specific semiconductor properties on the device performance and device characteristics, we consider two magnetic superlattices based on semiconductors having entirely different Landè g-factor: GaAs and InSb. Although slightly more efficient spin-inversion devices are obtained for the GaAs semiconductor, InSb requires lower magnetic fields and its efficiency can be close to 80%.