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arXiv 1002.0776cond-mat.mes-hall
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表面态的各向异性Rashba分裂理论

Theory of anisotropic Rashba splitting of surface states

E. Simon, A. Szilva, B. Ujfalussy, B. Lazarovits, G. Zarand, L. Szunyogh

摘要:

我们调查表面Rashba效应减少面内对称性的表面。制定一个k.p微扰理论,我们表明,Rashba分裂是各向异性的,在协议与基于mathony的考虑。我们表明,各向异性Rashba分裂是由于不同的对称性的体状态的混合物的表面状态,它不能解释在标准的理论图片假设只是一个正常的表面变化的晶体势。进行相对论从头计算,我们发现一个显着大的Rashba各向异性的未重建的Au(110)表面,在实验可达到的范围内。

英文摘要:

We investigate the surface Rashba effect for a surface of reduced in-plane symmetry. Formulating a k.p perturbation theory, we show that the Rashba splitting is anisotropic, in agreement with symmetry-based considerations. We show that the anisotropic Rashba splitting is due to the admixture of bulk states of different symmetry to the surface state, and it cannot be explained within the standard theoretical picture supposing just a normal-to-surface variation of the crystal potential. Performing relativistic ab initio calculations we find a remarkably large Rashba anisotropy for an unreconstructed Au(110) surface that is in the experimentally accessible range.

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