Speaker
Description
Superconducting transition metal dichalcogenides provide a rich platform for exploring unconventional superconductivity, the spin-orbit coupling effects, and impurity-induced phenomena in two-dimensional systems [1,2,3]. In the talk we discuss the impact of scalar and magnetic single impurities on the quasiparticle interference (QPI) patterns in the superconducting phase of monolayer NbSe$_2$, including the Rashba spin-orbit coupling. We focus on the formation of impurity-bound states, Yu-Shiba-Rusinov states and zero-bias bound states, investigating their signatures in the density of states and their manifestation in QPI patterns. Furthermore, we explore how electron and hole doping modulate the impurity-induced bound states, providing insights into the tunability of impurity physics in 2D superconductors. Exploration of the bound states provides relevant microscopic insight to understanding the impurity effects on unconventional superconductors.
Acknowledgements
This work was supported by the Slovak Research and Development Agency under the Contract no SK-CZ-RD-21-0114, VEGA Grant No. 1/0104/25, Slovak Academy of Sciences project IMPULZ IM-2021-42.
References
[1] J. Haniš, et al., Distinguishing nodal and nonunitary superconductivity in quasiparticle interference of an Ising superconductor with Rashba spin-orbit coupling: The example of NbSe$_2$, Phys. Rev. B 110, 104502 (2024).
[2] D. Sticlet, et al., Topological superconductivity from magnetic impurities on monolayer NbSe$_2$, Phys. Rev. B 100, 075420 (2019).
[3] X. Xi, et al., Ising pairing in superconducting NbSe$_2$ atomic layers, Nat. Phys. 12, 139 (2016).
