Detection of Majorana Kramers pairs using a quantum point contact

Abstract

We propose a setup that integrates a quantum point contact (QPC) and a Josephson junction on a quantum spin Hall sample, experimentally realizable in InAs/GaSb quantum wells. The confinement due to both the QPC and the superconductor results in a Kramers pair of Majorana zero-energy bound states when the superconducting phases in the two arms differ by an odd multiple of $\pi$ across the Josephson junction. We investigate the detection of these Majorana pairs with the integrated QPC, and find a robust switching from normal to Andreev scattering across the edges due to the presence of Majorana Kramers pairs. This transport signature is expected to be exhibited in measurements of differential conductance and/or current cross-correlation at low bias.

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Cited by in corpus (34)

• Majorana corner modes in a high-temperature platform
• Interacting topological edge channels
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• Conductance signatures of odd-frequency superconductivity in quantum spin Hall systems using a quantum point contact
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• ${\mathbb{Z}}_4$ parafermions in weakly interacting superconducting constrictions at the helical edge of quantum spin Hall insulators
• Quantum Computing with Majorana Kramers Pairs
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• Buried Dirac points in quantum spin Hall insulators: Implications for Majorana Kramers pair-based quantum computing