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Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111)

Abstract

There is presently a tremendous activity around the field of topological superconductivity and Majorana fermions. Among the many questions raised, it has become increasingly important to establish the topological or non-topological origin of features associated with Majorana fermions such as zero-bias peaks. Here, we compare in-gap features associated either with isolated magnetic impurities or with magnetic clusters strongly coupled to the atomically thin superconductor Pb/Si(111). We study this system by means of scanning tunneling microscopy and spectroscopy (STM/STS). We take advantage of the fact that the Pb/Si(111) monolayer can exist either in a crystal-ordered phase or in an incommensurate disordered phase to compare the observed spectroscopic features in both phases. This allows us to demonstrate that the strongly resolved in-gap states we found around the magnetic clusters in the disordered phase of Pb have a clear topological origin.

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References

  1. 1.

    C.-X. Liu, J.D. Sau, S. Das Sarma, Phys. Rev. B 97, 214502 (2018)

  2. 2.

    V. Mourik, K. Zuo, S.M. Frolov, S.R. Plissard, E.P.A.M. Bakkers, L.P. Kouwenhoven, Science 336, 1003 (2012)

  3. 3.

    S. Nadj-Perge, I.K. Drozdov, J. Li, H. Chen, S. Jeon, J. Seo, A.H. MacDonald, B.A. Bernevig, A. Yazdani, Science 346, 602 (2014)

  4. 4.

    P. Cheng, W.-J. Li, Y.-J. Sun, G. Wang, X.-G. Zhu, K. He, L. Wang, X. Ma, X. Chen, Y. Wang, Y. Liu, H.-Q. Lin, J.-F. Jia, Q.-K. Xue, Nat. Phys. 6, 104 (2010)

  5. 5.

    C. Brun, T. Cren, V. Cherkez, F. Debontridder, S. Pons, D. Fokin, M.C. Tringides, S. Bozhko, L.B. Ioffe, B.L. Altshuler, D. Roditchev, Nat. Phys. 10, 444 (2014)

  6. 6.

    L. Yu, Acta Phys. Sin. 21, 75 (1965)

  7. 7.

    H. Shiba, Progr. Theor. Phys. 40, 435 (1968)

  8. 8.

    A.I. Rusinov, JETP Lett. 85, 85 (1969)

  9. 9.

    G.C. Ménard, S. Guissart, C. Brun, R. Leriche, M. Trif, F. Debontridder, D. Demaille, D. Roditchev, P. Simon, T. Cren, Nat. Commun. 8, 2040 2017

  10. 10.

    K. Björnson, A.M. Black-Schaffer, Phys. Rev. B 97, 140504 (2018)

  11. 11.

    G.C. Ménard, S. Guissart, C. Brun, S. Pons, V.S. Stolyarov, F. Debontridder, M.V. Leclerc, E. Janod, L. Cario, D. Roditchev, P. Simon, T. Cren, Nat. Phys. 11, 1013 (2015)

  12. 12.

    M. Ruby, Y. Peng, F. von Oppen, B.W. Heinrich, K.J. Franke, Phys. Rev. Lett. 117, 186801 (2016)

  13. 13.

    D.-J. Choi, C. Rubio-Verdú, J. de Bruijckere, M.M. Ugeda, N. Lorente, J.I. Pascual, Nat. Commun. 8, 15175 (2017)

  14. 14.

    A. Yazdani, B.A. Jones, C.P. Lutz, M.F. Crommie, D.M. Eigler, Science 275, 1767 (1997)

  15. 15.

    S.-H. Ji et al., Phys. Rev. Lett. 100, 226801 (2008)

  16. 16.

    K.S. Kim, S.C. Jung, M.H. Kang, H.W. Yeom, Phys. Rev. Lett. 104, 246803 (2010)

  17. 17.

    L.P. Gor’kov, E.I. Rashba, Phys. Rev. Lett. 87, 037004 (2001)

  18. 18.

    T. Fukui, Y. Hatsugai, H. Suzuki, J. Phys. Soc. Jpn. 74, 1674 (2005)

  19. 19.

    G.C. Ménard, A. Mesaros, C. Brun, F. Debontridder, D. Roditchev, P. Simon, T. Cren, https://doi.org/1810.09541

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Correspondence to Pascal Simon.

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Ménard, G.C., Brun, C., Leriche, R. et al. Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111). Eur. Phys. J. Spec. Top. 227, 2303–2313 (2019). https://doi.org/10.1140/epjst/e2018-800056-3

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