Abstract
We analyze the effect of bulk inversion asymmetry (BIA) on the efficiency of nonmagnetic heterostructure resonant tunneling spin filters grown along $[001].$ We show that when only structural inversion asymmetry (SIA) is taken into account, the theoretical upper limit of current spin polarization for the Rashba effect resonant tunneling spin filter with a one-sided collector geometry is $2/\ensuremath{\pi}(\ensuremath{\approx}63.7%),$ independent of the direction of the one-sided collector. When both SIA and BIA effects are included, we can significantly enhance or degrade current spin polarization from the SIA-only value by varying the collection angle, with the best and worst directions, respectively, being $[110]$ and $[11\ifmmode\bar\else\textasciimacron\fi{}0]$ (or vice versa, depending on the relative sign between the SIA and BIA coefficients). We can similarly improve the spin filtering efficiency of Rashba effect resonant tunneling spin filters that rely on the use of a lateral electric field in the emitter region to induce spin polarization, simply by applying the field along $[110]$ (or $[11\ifmmode\bar\else\textasciimacron\fi{}0]).$
Published Version
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