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Andreev reflection resonant tunneling through a precessing spin | | Xiufeng Cao
; Yaoming Shi
; Xiaolong Song
; Hao Chen
; | | Date: |
11 Sep 2004 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | We investigate Andreev reflection (AR) resonant tunneling through a precessing spin which is coupled to a normal metallic lead and a superconducting lead. The formula of the AR conductance at zero temperature is obtained as a function of chemical potential and azimuthal angle of the spin precessing by using the nonequilibrium Green function method. It is found that as the local spin precesses in a weak external magnetic field at Larmor frequency $omega_l$, the AR tunneling conductance exhibits an oscillation at the frequency $2omega_l$ alone. The amplitude of AR conductance oscillation enhances with spin-flip tunneling coupling increasing. The study also shows that spin-orbit interaction in tunneling barriers is crucial for the oscillations of AR conductance. The effect of spin-flip tunneling coupling caused by spin-orbit interaction and local spin precessing on resonant behavior of the AR conductance are examined. | | Source: | arXiv, cond-mat/0409286 | | Services: | Forum | Review | PDF | Favorites | |
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