| Summary: | A 4<inline-formula> <math display="inline"> <semantics> <mi>π</mi> </semantics> </math> </inline-formula>-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<inline-formula> <math display="inline"> <semantics> <mi>π</mi> </semantics> </math> </inline-formula>-periodic contribution to the supercurrent. This work also reports the observation of a 4<inline-formula> <math display="inline"> <semantics> <mi>π</mi> </semantics> </math> </inline-formula>-periodic contribution to the supercurrent in BiSbTeSe<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>2</mn> </msub> </semantics> </math> </inline-formula>-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<inline-formula> <math display="inline"> <semantics> <mi>π</mi> </semantics> </math> </inline-formula>-periodic component to the supercurrent is found.
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