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

M. Veldhorst; M. Hoek; M. Snelder; H. Hilgenkamp; Alexandre Avraamovitch Golubov; Alexander Brinkman

doi:10.1103/PhysRevB.90.035428

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

M. Veldhorst, M. Hoek, M. Snelder, H. Hilgenkamp, Alexandre Avraamovitch Golubov, Alexander Brinkman

Research output: Contribution to journal › Article › Academic › peer-review

7 Citations (Scopus)

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 language	English
Article number	035428
Pages (from-to)	-
Number of pages	6
Journal	Physical Review B (Condensed Matter and Materials Physics)
Volume	90
Issue number	035428
DOIs	https://doi.org/10.1103/PhysRevB.90.035428
Publication status	Published - 2014

Keywords

IR-94511
METIS-309404

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10.1103/PhysRevB.90.035428

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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.",

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author = "M. Veldhorst and M. Hoek and M. Snelder and H. Hilgenkamp and Golubov, {Alexandre Avraamovitch} and Alexander Brinkman",

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Nonlocal spin-entangled Andreev reflection, fractional charge and current-phase relations in topological bilayer-exciton-condensate junctions. / Veldhorst, M.; Hoek, M.; Snelder, M. et al.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 90, No. 035428, 035428, 2014, p. -.

Research output: Contribution to journal › Article › Academic › peer-review

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 -

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

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Keywords

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