Tadeusz Domański (26.02, 12:15)
Affiliation: Marie Curie-Sklodowska University, Poland Title: Majorana quasiparticles in nanoscopic hybrid structures Abstract:Topological superconducting phase can be induced in nanostructures via the proximity effect, making use of either (i) the spin-orbit interactions combined with strong enough magnetic field or (ii) spiral ordering of the local magnetic moments. It is has been shown that boundaries of finite-size topological superconductors host the exotic Majorana quasi-particles. Indeed their localised versions have been observed at the ends of proximitized nanowires/nanochains [1] and nanostripes confined between superconducting reservoirs [2,3], whereas chiral mutations have been seen in the STM measurements at the edges of magnetic (Shiba) islands deposited on superconducting substrates [4-6]. Natural tendencyof the Majorana quasiparticles towards the boundaries or internal defects is responsible for their leakage on various side-coupled objects [7]. We explore efficiency of such leakage onto dim=0 [8,9] and dim=2 regions [10], and propose useful methods for their empirical detection [11]. [1] R.M. Lutchyn et al, Nature Rev. Mat. 3, 52 (2018).
[2] A. Fornieri et al & C.M. Marcus, arXiv:1809.03037 (2018).
[3] H. Ren et al & A. Yacoby, arXiv:1809.03076 (2018).
[4] G.C. Ménard et al, Nat. Commun. 8, 2040 (2017); arXiv:1810.09541 (2018).
[5] Q.L. He et al, Science 357, 294 (2017).
[6] A. Palacio-Morales et al & R. Wiesendanger, arXiv:1809.04503 (2018).
[7] M.-T. Deng et al & C.M. Marcus, Phys. Rev. B 98, 085125 (2018).
[8] A. Ptok, A. Kobia lka & T. Domański, Phys. Rev. B 96, 195430 (2017).
[9] G. Górski, J. Barański, I. Weymann & T. Domański, Sci. Rep. 8, 15717 (2018).
[10] A. Kobia lka, T. Domański & A. Ptok, arXiv:1808.05281 (2018).
[11] M.M. Maśka and T. Domański, Sci. Rep. 7, 16193 (2017).