Majorana edge modes of topological exciton condensate with superconductors

Abstract

I study the edge states of the topological exciton condensate formed by Coulomb interaction between two parallel surfaces of a strong topological insulator. When the condensate is contacted by superconductors with a π phase shift across the two surfaces, a pair of counter-propagating Majorana modes close the gap at the boundary. I propose a nano-structured system of topological insulators and superconductors to realize unpaired Majorana fermions. The Majorana signal can be used to detect the formation of the topological exciton condensate. The relevant experimental signatures as well as implications for related systems are discussed.

arXiv comment4 pages, 4 figures; (v2) Eq. 7 and Fig. 4 and various typos corrected. All conclusions remain the same

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Cited by in corpus (15)

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• A Gapless Symmetry-Protected Topological Phase of Fermions in One Dimension
• Time-Reversal Invariant Topological Superconductivity Induced by Repulsive Interactions in Quantum Wires
• Electron-hole pairing in topological insulator thin film
• Majorana Flat Bands in s-Wave Gapless Topological Superconductors
• Lattice model for the surface states of a topological insulator with applications to magnetic and exciton instabilities
• Multiband s-wave topological superconductors: role of dimensionality and magnetic field response
• Coulomb interaction effects on the Majorana states in quantum wires
• 1D Majorana Goldstinos and partial supersymmetry breaking in quantum wires
• Non-Abelian fermion parity interferometry of Majorana bound states in a Fermi sea
• Dispersive 1D Majorana modes with emergent supersymmetry in 1D proximitized superconductors via spatially-modulated potentials and magnetic fields
• Fluctuational internal Josephson effect in topological insulator film
• Zero modes of the generalized fermion-vortex system in magnetic field
• Transport in a thin topological insulator with potential and magnetic barriers
• Signatures in the conductance for phase transitions in excitonic systems