Abstract
A 4-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-periodic contribution to the supercurrent. This work also reports the observation of a 4-periodic contribution to the supercurrent in BiSbTeSe-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-periodic component to the supercurrent is found.
Highlights
For a junction width of4.2 μm, this leads to an effective length of 780 nm. This value is reasonable considering the flux focusing effect [25]
Topological insulators have been a popular topic of research for over a decade
With potential applications from spintronics [1,2] to topological quantum computation [3,4], especially the transport properties are heavily studied in topological insulators
Summary
4.2 μm, this leads to an effective length of 780 nm. This value is reasonable considering the flux focusing effect [25]. The small critical current makes noise an important source of rounding of the Shapiro steps These curves are quantified by counting the amount of data-points in a set of voltage bins, as shown in the right hand plot of Figure 2a. The effect of an increase in temperature on the radio frequency response was studied in device 1 This led to the conclusion that the first Shapiro step is disproportionately suppressed in the BiSbTeSe2 junction even when taking the low temperature opacity into account. The resistivelyshunted junction model was used to calculate the junction voltage in the presence of radio frequency irradiation
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