Optical Responses of Chiral Majorana Edge States in Two-Dimensional Topological Superconductors

Abstract

Majorana fermions exist on the boundaries of two-dimensional topological superconductors (TSCs) as charge-neutral quasi-particles. The neutrality makes the detection of such states challenging from both experimental and theoretical points of view. Current methods largely rely on transport measurements in which Majorana fermions manifest themselves by inducing electron-pair tunneling at the lead-contacting point. Here we show that chiral Majorana fermions in TSCs generate {enhanced} local optical response. The features of local optical conductivity distinguish them not only from trivial superconductors or insulators but also from normal fermion edge states such as those in quantum Hall systems. Our results provide a new applicable method to detect dispersive Majorana fermions and may lead to a novel direction of this research field.

5 pages, 4 figures

References in corpus (3)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)

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• Dispersive 1D Majorana modes with emergent supersymmetry in 1D proximitized superconductors via spatially-modulated potentials and magnetic fields
• Directly probing the chirality of Majorana edge states
• Nonlinear optical responses in superconductors under magnetic fields: quantum geometry and topological superconductivity
• Optical signatures of Euler superconductors
• Local Raman Spectroscopy of Chiral Majorana Edge Modes in Kitaev Spin Liquids and Topological Superconductors
• Majorana Spin Current Generation by Dynamic Strain
• Optical conductivity of the Majorana mode at the s- and d-wave topological superconductor edge
• Edge optical effect as a probe of chiral topological superconductors
• Pairing-induced Momentum-space Magnetism and Its Implication In Optical Anomalous Hall Effect In Chiral Superconductors