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@ARTICLE{Reich:1043251,
author = {Reich, Adrian and Shapiro, Dmitrii and Shnirman, Alexander},
title = {{B}erezinskii-{K}osterlitz-{T}houless transitions in a
topological superconductor-ferromagnet-superconductor
junction},
journal = {Physical review / B},
volume = {111},
number = {20},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2025-02801},
pages = {205428},
year = {2025},
abstract = {We investigate quantum phase transitions in a topological
Josephson junction with an embedded ferromagnetic layer,
revealing a rich landscape of critical phenomena. The
low-energy excitations comprise Majorana fermions
propagating along the junction, coupled to the magnons in
the ferromagnet. Based on mean-field and renormalization
group arguments, we predict Berezinskii-Kosterlitz-Thouless
(BKT) transitions in this system, both in the case of a
magnetic easy-plane and weak easy-axis anisotropy. In the
latter case, this is based on an emergent effective easy
plane, spanned by the easy axis and the component of the
magnetization, which couples to the Majoranas. We conclude
by presenting a conjecture for the full phase diagram of the
model. It covers BKT transitions as well as exotic
multicritical and supersymmetric points known from related
models of interacting real fermions and bosons.},
cin = {PGI-12},
ddc = {530},
cid = {I:(DE-Juel1)PGI-12-20200716},
pnm = {5223 - Quantum-Computer Control Systems and Cryoelectronics
(POF4-522)},
pid = {G:(DE-HGF)POF4-5223},
typ = {PUB:(DE-HGF)16},
UT = {WOS:001501238000004},
doi = {10.1103/PhysRevB.111.205428},
url = {https://juser.fz-juelich.de/record/1043251},
}