Dynamical vortices in electron-phonon superconductors

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Dynamical vortices in electron-phonon superconductors. / Christensen, Morten H.; Chubukov, Andrey.

In: Physical Review B, Vol. 104, No. 14, 140501, 05.10.2021.

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

Harvard

Christensen, MH & Chubukov, A 2021, 'Dynamical vortices in electron-phonon superconductors', Physical Review B, vol. 104, no. 14, 140501. https://doi.org/10.1103/PhysRevB.104.L140501

APA

Christensen, M. H., & Chubukov, A. (2021). Dynamical vortices in electron-phonon superconductors. Physical Review B, 104(14), [140501]. https://doi.org/10.1103/PhysRevB.104.L140501

Vancouver

Christensen MH, Chubukov A. Dynamical vortices in electron-phonon superconductors. Physical Review B. 2021 Oct 5;104(14). 140501. https://doi.org/10.1103/PhysRevB.104.L140501

Author

Christensen, Morten H. ; Chubukov, Andrey. / Dynamical vortices in electron-phonon superconductors. In: Physical Review B. 2021 ; Vol. 104, No. 14.

Bibtex

@article{3d548f18df324d66b59c1a6d5876a319,
title = "Dynamical vortices in electron-phonon superconductors",
abstract = "We analyze the structure of an s-wave superconducting gap in systems with electron-phonon attraction and electron-electron repulsion. Earlier works have found that superconductivity develops despite strong repulsion, but the gap, Delta(omega(m)), necessarily changes sign along the Matsubara axis. We analyze the sign-changing gap function from a topological perspective using the knowledge that a nodal point of Delta(omega(m)) is the center of dynamical vortex. We consider two models with different cutoffs for the repulsive interaction and trace the vortex positions along the Matsubara axis and in the upper frequency half plane on changing the relative strength of the attractive and repulsive parts of the interaction. We discuss how the presence of dynamical vortices affects the gap structure along the real frequency axis, detectable in ARPES experiments.",
author = "Christensen, {Morten H.} and Andrey Chubukov",
year = "2021",
month = oct,
day = "5",
doi = "10.1103/PhysRevB.104.L140501",
language = "English",
volume = "104",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "14",

}

RIS

TY - JOUR

T1 - Dynamical vortices in electron-phonon superconductors

AU - Christensen, Morten H.

AU - Chubukov, Andrey

PY - 2021/10/5

Y1 - 2021/10/5

N2 - We analyze the structure of an s-wave superconducting gap in systems with electron-phonon attraction and electron-electron repulsion. Earlier works have found that superconductivity develops despite strong repulsion, but the gap, Delta(omega(m)), necessarily changes sign along the Matsubara axis. We analyze the sign-changing gap function from a topological perspective using the knowledge that a nodal point of Delta(omega(m)) is the center of dynamical vortex. We consider two models with different cutoffs for the repulsive interaction and trace the vortex positions along the Matsubara axis and in the upper frequency half plane on changing the relative strength of the attractive and repulsive parts of the interaction. We discuss how the presence of dynamical vortices affects the gap structure along the real frequency axis, detectable in ARPES experiments.

AB - We analyze the structure of an s-wave superconducting gap in systems with electron-phonon attraction and electron-electron repulsion. Earlier works have found that superconductivity develops despite strong repulsion, but the gap, Delta(omega(m)), necessarily changes sign along the Matsubara axis. We analyze the sign-changing gap function from a topological perspective using the knowledge that a nodal point of Delta(omega(m)) is the center of dynamical vortex. We consider two models with different cutoffs for the repulsive interaction and trace the vortex positions along the Matsubara axis and in the upper frequency half plane on changing the relative strength of the attractive and repulsive parts of the interaction. We discuss how the presence of dynamical vortices affects the gap structure along the real frequency axis, detectable in ARPES experiments.

U2 - 10.1103/PhysRevB.104.L140501

DO - 10.1103/PhysRevB.104.L140501

M3 - Journal article

VL - 104

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 14

M1 - 140501

ER -

ID: 281983614