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Tunable second harmornic in altermagnetic Josephson junctions
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abstract
We study the influence of external electric and Zeeman fields on the Josephson effect in a planar superconductor/altermagnet/superconductor junction. Remarkably, we find that the current-phase relation (CPR) can be forward or backward skewed due to a pronounced second harmonic term. It decisively depends on the altermagnetic field strength. This second harmonic can be measured directly using double SQUID devices. The CPR skewness can be effectively manipulated by electric gating. Moreover, we identify two additional impacts of external electric and magnetic fields on the Josephson current: (i) Fields can induce 0-$\pi$ transitions. (ii) Fields can substantially enhance the critical current. This enhancement is surprising since supercurrents are typically suppressed by magnetic fields.
Forward citations
Cited by 2 Pith papers
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Effect of 2$^\text{nd}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier
A Josephson traveling-wave parametric amplifier with a second-harmonic current-phase relation reaches about 13 dB gain at an optimal harmonic weight g = -0.6, without dispersion engineering.
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Orientation-dependent transport in junctions formed by $d$-wave altermagnets and $d$-wave superconductors
In d-wave superconductor/altermagnet junctions, the altermagnet symmetry governs the formation of de Gennes-Saint-James bound states and the appearance of first-order Josephson coupling.
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