Nonlocal Andreev reflection, fractional charge and current-phase relation in topological bilayer exciton condensate junctions
Abstract
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.
Keywords
Cite
@article{arxiv.1407.2298,
title = {Nonlocal Andreev reflection, fractional charge and current-phase relation in topological bilayer exciton condensate junctions},
author = {M. Veldhorst and M. Hoek and M. Snelder and H. Hilgenkamp and A. A. Golubov and A. Brinkman},
journal= {arXiv preprint arXiv:1407.2298},
year = {2015}
}
Comments
Submitted to Physical Review B