Absence of supercurrent sign reversal in a topological junction with a quantum dot

Research output: Contribution to journal › Journal article › peer-review

Standard

Absence of supercurrent sign reversal in a topological junction with a quantum dot. / Schulenborg, J.; Flensberg, K.

In: Physical Review B, Vol. 101, No. 1, 014512, 28.01.2020.

Research output: Contribution to journal › Journal article › peer-review

Harvard

Schulenborg, J & Flensberg, K 2020, 'Absence of supercurrent sign reversal in a topological junction with a quantum dot', Physical Review B, vol. 101, no. 1, 014512. https://doi.org/10.1103/PhysRevB.101.014512

APA

Schulenborg, J., & Flensberg, K. (2020). Absence of supercurrent sign reversal in a topological junction with a quantum dot. Physical Review B, 101(1), [014512]. https://doi.org/10.1103/PhysRevB.101.014512

Vancouver

Schulenborg J, Flensberg K. Absence of supercurrent sign reversal in a topological junction with a quantum dot. Physical Review B. 2020 Jan 28;101(1). 014512. https://doi.org/10.1103/PhysRevB.101.014512

Author

Schulenborg, J. ; Flensberg, K. / Absence of supercurrent sign reversal in a topological junction with a quantum dot. In: Physical Review B. 2020 ; Vol. 101, No. 1.

Bibtex

@article{577ce1d2f85343d7a9f55fa9d302deb2,
title = "Absence of supercurrent sign reversal in a topological junction with a quantum dot",
abstract = "Experimental techniques to verify Majoranas are of current interest. A prominent test is the effect of Majoranas on the Josephson current between two wires linked via a normal junction. Here, we study the case of a quantum dot connecting the two superconductors and the sign of the supercurrent in the trivial and topological regimes under grand-canonical equilibrium conditions, explicitly allowing for parity changes due to, e.g., quasiparticle poisoning. We find that the well-known supercurrent reversal for odd occupancy of the quantum dot (π junction) in the trivial case does not occur in the presence of Majoranas in the wires. However, we also find this to be a mere consequence of Majoranas being zero energy states. Therefore, the lack of supercurrent sign reversal can also be caused by trivial bound states and is thus not a discriminating signature of Majoranas.",
author = "J. Schulenborg and K. Flensberg",
year = "2020",
month = jan,
day = "28",
doi = "10.1103/PhysRevB.101.014512",
language = "English",
volume = "101",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "1",

}

RIS

TY - JOUR

T1 - Absence of supercurrent sign reversal in a topological junction with a quantum dot

AU - Schulenborg, J.

AU - Flensberg, K.

PY - 2020/1/28

Y1 - 2020/1/28

N2 - Experimental techniques to verify Majoranas are of current interest. A prominent test is the effect of Majoranas on the Josephson current between two wires linked via a normal junction. Here, we study the case of a quantum dot connecting the two superconductors and the sign of the supercurrent in the trivial and topological regimes under grand-canonical equilibrium conditions, explicitly allowing for parity changes due to, e.g., quasiparticle poisoning. We find that the well-known supercurrent reversal for odd occupancy of the quantum dot (π junction) in the trivial case does not occur in the presence of Majoranas in the wires. However, we also find this to be a mere consequence of Majoranas being zero energy states. Therefore, the lack of supercurrent sign reversal can also be caused by trivial bound states and is thus not a discriminating signature of Majoranas.

AB - Experimental techniques to verify Majoranas are of current interest. A prominent test is the effect of Majoranas on the Josephson current between two wires linked via a normal junction. Here, we study the case of a quantum dot connecting the two superconductors and the sign of the supercurrent in the trivial and topological regimes under grand-canonical equilibrium conditions, explicitly allowing for parity changes due to, e.g., quasiparticle poisoning. We find that the well-known supercurrent reversal for odd occupancy of the quantum dot (π junction) in the trivial case does not occur in the presence of Majoranas in the wires. However, we also find this to be a mere consequence of Majoranas being zero energy states. Therefore, the lack of supercurrent sign reversal can also be caused by trivial bound states and is thus not a discriminating signature of Majoranas.

U2 - 10.1103/PhysRevB.101.014512

DO - 10.1103/PhysRevB.101.014512

M3 - Journal article

AN - SCOPUS:85078700343

VL - 101

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 1

M1 - 014512

ER -

ID: 242668059