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We present an experimental study of inverted InAs/GaSb composite quantumwells in the hybridization regime and contacted by superconducting electrodes.A front gate is used to vary the Fermi level into the mini-gap, where recentexperiments indicate existence of helical edge modes [arXiv:1105.0137]. Zerobias dips in differential resistance are observed across the mini-gap,suggesting transport dominated by Andreev reflection processes. Evolution ofthe mini-gap differential resistance with applied bias as well as measuredmini-gap excess current of 150 nA are in good agreement with the prediction ofperfect Andreev reflection of the helical edge modes, which is necessitated bythe absence of back-scattering channels. The perfect Andreev reflection occursin spite of a finite barrier at the interface and shows strong sensitivity totime-reversal breaking - hallmarks of the helical nature of quantum spin Halledges.

Perfect Andreev Reflection of Helical Edge Modes in InAs/GaSb Quantum Wells