The invisible Majorana bound state at the helical edgeChristoph Fleckenstein, Felix Keidel, Björn Trauzettel and Niccoló Traverso ZianiEur. Phys. J. Special Topics, 227 12 (2018) 1377-1386DOI: https://doi.org/10.1140/epjst/e2018-800093-5