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

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Excitons
condensates
excitons
specular reflection
Josephson junctions
Relaxation processes
incidence
signatures
LDS 751

Keywords

  • IR-94511
  • METIS-309404

Cite this

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title = "Nonlocal spin-entangled Andreev reflection, fractional charge and current-phase relations in topological bilayer-exciton-condensate junctions",
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.",
keywords = "IR-94511, METIS-309404",
author = "M. Veldhorst and M. Hoek and M. Snelder and H. Hilgenkamp and Golubov, {Alexandre Avraamovitch} and Alexander Brinkman",
year = "2014",
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language = "English",
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TY - JOUR

T1 - Nonlocal spin-entangled Andreev reflection, fractional charge and current-phase relations in topological bilayer-exciton-condensate junctions

AU - Veldhorst, M.

AU - Hoek, M.

AU - Snelder, M.

AU - Hilgenkamp, H.

AU - Golubov, Alexandre Avraamovitch

AU - Brinkman, Alexander

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - IR-94511

KW - METIS-309404

U2 - 10.1103/PhysRevB.90.035428

DO - 10.1103/PhysRevB.90.035428

M3 - Article

VL - 90

SP - -

JO - Physical review B: Covering condensed matter and materials physics

JF - Physical review B: Covering condensed matter and materials physics

SN - 2469-9950

IS - 035428

M1 - 035428

ER -