Jens Wiebe, Department of Physics, Universität Hamburg, Germany

Thursday June. 17 2021, 2:00 PM

Evidence for p-wave pairing and hybridizing Majoranas in artificial finite-size Shiba chains

A magnetic chain on an s-wave superconductor hosting a spin spiral or strong spin-orbit coupling can potentially realize a one-dimensional topological superconductor with Majorana bound states on its edges. Here, we investigate artificial spin chains which have been built atom-by[1]atom [1], with respect to the emergence of such topologically nontrivial electron phases. We vary the substrate and adatom species and the interatomic distances in the chain [2-5]. By this approach we can adjust the energetic positions of the multi-orbital Yu-Shiba-Rusinov (YSR) states induced by the adatoms [2,3], the hybridizations between these YSR states [4], as well as the spin structure in the chain [5]. This eventually enables to tailor the multi-orbital YSR bands emerging in the chain such that a p-wave gap opens in one of the YSR bands [6], and weakly protected, interacting Majorana bound states [7] have been realized.

We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via the Cluster of Excellence ’Advanced Imaging of Matter’ (EXC 2056-project ID 390715994), via the SFB-925 – project 170620586, and by the ERC via the Advanced Grant ADMIRE (No. 786020).

[1] D.-J. Choi, N. Lorente, J. Wiebe, K. von Bergmann, A. F. Otte, and A. J. Heinrich, Rev. Mod. Phys. 91, 041001 (2019).

[2] L. Schneider, M. Steinbrecher, L. Rózsa, J. Bouaziz, K. Palotás, M. dos Santos Dias, S. Lounis, J. Wiebe, and R. Wiesendanger, npj Quantum Materials 4, 42 (2019).

[3] L. Schneider, S. Brinker, M. Steinbrecher, J. Hermenau, T. Posske, M. dos Santos Dias, S. Lounis, R. Wiesendanger, and J. Wiebe, Nature Commun. 11, 4707 (2020).

[4] P. Beck, L. Schneider, L. Rózsa, K. Palotás, A. Lászlóffy, L. Szunyogh, J. Wiebe, and R. Wiesendanger, Nature Commun. 12, 2040 (2021).

[5] L. Schneider, P. Beck, J. Wiebe, and R. Wiesendanger, Science Advances 7, eabd7302 (2021).

[6] L. Schneider, P. Beck, T. Posske, D. Crawford, E. Mascot, S. Rachel, R. Wiesendanger, and J. Wiebe, Nat. Phys. (2021).

[7] L. Schneider, P. Beck, J. Neuhaus-Steinmetz, T. Posske, J. Wiebe, and R. Wiesendanger, arXiv:2104.11503 [cond-mat.supr-con] (2021)

Haut de page

À lire aussi...

Johnpierre Paglione, Maryland Quantum Materials Center

November 12, 02:00 PM, Paris Time (GMT +1) Zoom link : ID : 999 0093 (...) 

> Lire la suite...

Masoumeh Keshavarz, Molecular Imaging and Photonics, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium

Shedding light on the optoelectronic and structural properties of halide perovskites January 21, 02:00 PM, Paris Time (GMT +1) The extraordinary (...) 

> Lire la suite...