Spin-Dependent Multichannel Tunneling of an Electron in a Nanotube with an Impurity in a Longitudinal Magnetic Field

Multichannel quantum tunneling of an electron through a potential barrier of a thin impurity introduced into a nanotube in the presence of a longitudinal magnetic field of arbitrary intensity is investigated. Tunneling and polarization characteristics of the system are studied in detail and illustrated as a function of the electron energy, nanotube radius, and magnetic field induction. It is indicated that in some electron energy ranges the system can operate as an ideal polarizer of the electron flow.