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

We study Andreev reflection and Josephson currents in topological bilayer exciton condensates (TEC). 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-TI-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.

preprint2014arXivOpen access
M. VeldhorstM. HoekM. SnelderH. HilgenkampA. A. GolubovA. Brinkman
cond-mat.mes-hallcond-mat.supr-concond-mat.str-el
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M. VeldhorstM. HoekM. SnelderH. HilgenkampA. A. GolubovA. Brinkman

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