Spin-polarized multiple Andreev reflections in spin-split superconductors

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Spin-polarized multiple Andreev reflections in spin-split superconductors. / Lu, Bo; Burset, Pablo; Tanaka, Yukio.

In: Physical Review B, Vol. 101, No. 2, 020502, 08.01.2020, p. 1-6.

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@article{6ddae1136f2041eba3b4a6abf01174f3,
title = "Spin-polarized multiple Andreev reflections in spin-split superconductors",
abstract = "We study the transport properties of a voltage-biased contact between two spin-split superconductors separated by an insulating barrier of arbitrary transparency. At low transparency, the contribution of multiple Andreev reflections leads to a subharmonic gap structure that crucially depends on the amplitude and relative angle of the spin-splitting fields of each superconductor. For noncollinear fields, we find an interesting even-odd effect on the bound states within the gap, where the odd order multiple Andreev reflections split, but the even order ones remain at their expected positions. By computing the current-voltage characteristics, we determine the transparency required for the emergence of a subharmonic gap structure and show that the splitting of the odd bound states is associated with different threshold energies of spin-polarized Andreev processes. Our findings provide a tool to experimentally determine the amplitude and alignment of Zeeman fields in spin-split superconductors.",
keywords = "ENERGY-GAP STRUCTURE, MAGNETIC-FIELD",
author = "Bo Lu and Pablo Burset and Yukio Tanaka",
note = "| openaire: EC/H2020/743884/EU//DiracEntangler",
year = "2020",
month = "1",
day = "8",
doi = "10.1103/PhysRevB.101.020502",
language = "English",
volume = "101",
pages = "1--6",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "2",

}

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TY - JOUR

T1 - Spin-polarized multiple Andreev reflections in spin-split superconductors

AU - Lu, Bo

AU - Burset, Pablo

AU - Tanaka, Yukio

N1 - | openaire: EC/H2020/743884/EU//DiracEntangler

PY - 2020/1/8

Y1 - 2020/1/8

N2 - We study the transport properties of a voltage-biased contact between two spin-split superconductors separated by an insulating barrier of arbitrary transparency. At low transparency, the contribution of multiple Andreev reflections leads to a subharmonic gap structure that crucially depends on the amplitude and relative angle of the spin-splitting fields of each superconductor. For noncollinear fields, we find an interesting even-odd effect on the bound states within the gap, where the odd order multiple Andreev reflections split, but the even order ones remain at their expected positions. By computing the current-voltage characteristics, we determine the transparency required for the emergence of a subharmonic gap structure and show that the splitting of the odd bound states is associated with different threshold energies of spin-polarized Andreev processes. Our findings provide a tool to experimentally determine the amplitude and alignment of Zeeman fields in spin-split superconductors.

AB - We study the transport properties of a voltage-biased contact between two spin-split superconductors separated by an insulating barrier of arbitrary transparency. At low transparency, the contribution of multiple Andreev reflections leads to a subharmonic gap structure that crucially depends on the amplitude and relative angle of the spin-splitting fields of each superconductor. For noncollinear fields, we find an interesting even-odd effect on the bound states within the gap, where the odd order multiple Andreev reflections split, but the even order ones remain at their expected positions. By computing the current-voltage characteristics, we determine the transparency required for the emergence of a subharmonic gap structure and show that the splitting of the odd bound states is associated with different threshold energies of spin-polarized Andreev processes. Our findings provide a tool to experimentally determine the amplitude and alignment of Zeeman fields in spin-split superconductors.

KW - ENERGY-GAP STRUCTURE

KW - MAGNETIC-FIELD

U2 - 10.1103/PhysRevB.101.020502

DO - 10.1103/PhysRevB.101.020502

M3 - Article

VL - 101

SP - 1

EP - 6

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 2

M1 - 020502

ER -

ID: 40548476