Spin-polarized current produced by a double barrier resonant tunneling diode |
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Authors: | J-B Xia G-Q Hai JN Wang |
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Abstract: | The spin-polarized tunneling current through a double barrier resonant tunneling diode (RTD) made with a semimagnetic semiconductor is studied theoretically. The calculated spin-polarized current and polarization degree are in agreement with recent experimental results. It is predicted that the polarization degree can be modulated continuously from +1 to −1 by changing the external voltage such that the quasi-confined spin-up and spin-down energy levels shift downwards from the Fermi level to the bottom of the conduction band. The RTD with low potential barrier or the tunneling through the second quasi-confined state produces larger spin-polarized current. Furthermore a higher magnetic field enhances the polarization degree of the tunneling current. |
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Keywords: | 72 10 &minus d 72 25 Dc 72 25 Hg 75 50 Pp |
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