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Rashba spin-orbit coupling effects in quasiparticle interference of non-centrosymmetric superconductors

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Akbari,  A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Thalmeier,  P.
Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Akbari, A., & Thalmeier, P. (2013). Rashba spin-orbit coupling effects in quasiparticle interference of non-centrosymmetric superconductors. Europhysics Letters, 102(5): 57008, pp. 57008-1-57008-6. doi:10.1209/0295-5075/102/57008.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1EAA-4
Abstract
The theory of quasiparticle interference (QPI) for non-centrosymmetric (NCS) superconductors with Rashba spin-orbit coupling is developed using the T -matrix theory in Born approximation. We show that qualitatively new effects in the QPI pattern originate from the Rashba spin-orbit coupling: The resulting spin coherence factors lead to a distinct difference of charge-and spin-QPI and to an induced spin anisotropy in the latter even for isotropic magnetic impurity scattering. In particular a cross-QPI appears describing the spin oscillation pattern due to non-magnetic impurity scattering which is directly related to the Rashba vector. We apply our theory to a 2D model for the NCS heavy fermion unconventional superconductor CePt3Si and discuss the new QPI features for a gap model with accidental node lines due to its composite singlet-triplet nature. Copyright (C) EPLA, 2013