Induced Topological Superconductivity in a BiSbTeSe(2)-Based Josephson Junction

A 4 [Formula: see text]-periodic supercurrent through a Josephson junction can be a consequence of the presence of Majorana bound states. A systematic study of the radio frequency response for several temperatures and frequencies yields a concrete protocol for examining the 4 [Formula: see text]-periodic contribution to the supercurrent. This work also reports the observation of a 4 [Formula: see text]-periodic contribution to the supercurrent in BiSbTeSe [Formula: see text]-based Josephson junctions. As a response to irradiation by radio frequency waves, the junctions showed an absence of the first Shapiro step. At high irradiation power, a qualitative correspondence to a model including a 4 [Formula: see text]-periodic component to the supercurrent is found.