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Superconductivity in Dirac electrons has recently been proposed as a newplatform between novel concepts in high-energy and condensed matter physics. Ithas been proposed that supersymmetry and exotic quasiparticles, both of whichremain elusive in particle physics, may be realized as emergent particles insuperconducting Dirac electron systems. Using artificially fabricatedtopological insulator-superconductor heterostructures, we present directspectroscopic evidence for the existence of Cooper pairing in a half Dirac gas2D topological superconductor. Our studies reveal that superconductivity in ahelical Dirac gas is distinctly different from that of in an ordinarytwo-dimensional superconductor while considering the spin degrees of freedom ofelectrons. We further show that the pairing of Dirac electrons can besuppressed by time-reversal symmetry breaking impurities removing thedistinction. Our demonstration and momentum-space imaging of Cooper pairing ina half Dirac gas and its magnetic behavior taken together serve as a criticallyimportant 2D topological superconductor platform for future testing of novelfundamental physics predictions such as emergent supersymmetry and quantumcriticality in topological systems.

Momentum space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (a helical 2D topological superconductor)