Nonlocal spin-entangled Andreev reflection, fractional charge and current-phase relations in topological bilayer-exciton-condensate junctions

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Abstract

We study Andreev reflection and Josephson currents in topological bilayer exciton condensates (TECs). These systems can create 100% spin-entangled nonlocal currents with high amplitudes due to perfect nonlocal Andreev reflection. This Andreev reflection process can be gate tuned from a regime of purely retro reflection to purely specular reflection. We have studied the bound states in TEC–topological-insulator–TEC Josephson junctions and find a gapless dispersion for perpendicular incidence. The presence of a sharp transition in the supercurrent-phase relationship when the system is in equilibrium is a signature of fractional charge, which can be further revealed in ac measurements faster than relaxation processes via Landau-Zener processes.
Original languageEnglish
Article number035428
Pages (from-to)-
Number of pages6
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume90
Issue number035428
DOIs
Publication statusPublished - 2014

Keywords

  • IR-94511
  • METIS-309404

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