Orientation-dependent Josephson effect in spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions
arxiv(2024)
摘要
We study the Josephson effect in the spin-singlet
superconductor/altermagnet/spin-triplet superconductor junctions using the
Green's function method. The current-phase difference relationships in the
junctions strongly depend on the orientation of altermagnet and the types of
the Cooper pairs. For the orientation angle equal to odd multiples of π/4,
the current-phase difference relationships are of the sin2ϕ type, which
are irrespective of the pairing wave functions in superconductors. For the
other orientation angles, the emergence of the lowest order current becomes
possible and its form, sinϕ or cosϕ, depends on the pairing wave
functions in superconductors. The ϕ_0 phase and the 0-π transition
can be realized in our junctions due to the appearance of the lowest order
current. The selection rules for the lowest order current are presented. The
symmetric relations satisfied by the current-phase difference relationships are
analyzed through considering the transformations of the junctions under the
mirror reflection, the time-reversal and the spin rotation operations. Our
results not only provide a method to detect the intrinsic spin-triplet
superconductivity but also possess application values in the design of the
field-free quantum devices.
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