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Satofumi Souma,Matsuto Ogawa 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
Based on the atomistic tight-binding method with intra-atomic spin-orbit coupling, we study computationally the effect of atomic scale interface asymmetry on the spin-polarization of transmission peaks through InAs/AlSb double barrier resonant tunneling heterostructures. Our calculations show the significant anisotropic zero-magnetic-field spin-splitting of the resonant transmission peak even in the absence of the external electric field, demonstrating the importance of the barrier material and the atomic scale detail of the hetero interfaces on the spin-splitting. Moreover, our calculations have predicted that such interface induced anisotropy of the spin-splitting can be cancelled out by applying the external electric field, leading to the Dresselhaus-type isotropic spin-splitting behavior.