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We investigate hybrid structures based on a bilayer quantum spin Hall systemin proximity to an s-wave superconductor as a platform to mimic time-reversalsymmetric topological superconductors. In this bilayer setup, the inducedpairing can be of intra- or inter-layer type, and domain walls of thosedifferent types of pairing potentials host Kramers partners (time-reversalconjugate pairs) of Majorana bound states. Interestingly, we discover that suchtopological interfaces providing Majorana bound states can also be achieved inan otherwise homogeneous system by a spatially dependent inter-layer gatevoltage. This gate voltage causes the relative electron densities of the twolayers to vary accordingly which suppresses the inter-layer pairing in regionswith strong gate voltage. We identify particular transport signatures(zero-bias anomalies) in a five-terminal setup that are uniquely related to thepresence of Kramers pairs of Majorana bound states.

Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems