Effect of Rashba splitting on RKKY interaction in topological insulator thin films

Abstract

In this work we have investigated the effect of Rashba splitting on the RKKY interaction in TI thin film both at finite and zero chemical potential. We find that the spin susceptibility of Rashba materials including TI thin film is strongly dependent on the direction of distance vector. Moreover, we find another term in the off-diagonal terms of the spin-susceptibility tensor which in contrast to the well-known DM-like term is symmetric. We show how one can tune the RKKY interaction by using electric field applied perpendicularly to the surface plane and by small chemical doping giving rise to enhance the RKKY term, drastically. We have presented our results for two different situations, namely inter-surface pairing of magnetic impurities as well as intra-surface one. The behavior of these two situations is completely different which we describe it by mapping the density of states of each surface on the band dispersion.

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• Interlayer RKKY Coupling in Bulk Rashba Semiconductors under Topological Phase Transition
• Floquet-driven indirect exchange interaction mediated by topological insulator surface states
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• Strain-induced modulation of exchange interaction in monolayer zigzag nanoribbons of B${}_2$S
• Tuning the electronic structure and magnetic coupling in armchair B${}_2$S nanoribbons using strain and staggered sublattice potential
• Selective generation and amplification of RKKY interactions by P-N interface
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• RKKY interaction in triplet superconductors: Dzyaloshinskii-Moriya-type interaction mediated by spin-polarized Cooper pairs
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• Highly tunable magnetic coupling in ultrathin topological insulator films due to impurity resonances
• Dzyaloshinskii-Moriya-type spin-spin interaction from mixed-parity superconductivity
• Enhancement of Curie Temperature in Ferromagnetic Insulator-Topological Insulator Heterostructures