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Quasiperiodic criticality and spin-triplet superconductivity in superconductor-antiferromagnet moiré patterns
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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10
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Physical Review Research, Volume 3, issue 1, pp. 1-10
Abstract
Quasiperiodicity has long been known to be a potential platform to explore exotic phenomena, realizing an intricate middle point between ordered solids and disordered matter. In particular, quasiperiodic structures are promising playgrounds to engineer critical wave functions, a powerful starting point to engineer exotic correlated states. Here we show that systems hosting a quasiperiodic modulation of antiferromagnetism and spin-singlet superconductivity, as realized by atomic chains in twisted van der Waals materials, host a localization-delocalization transition as a function of the coupling strength. Associated with this transition, we demonstrate the emergence of a robust quasiperiodic critical point for arbitrary incommensurate potentials, which appears for generic relative weights of the spin-singlet superconductivity and antiferromagnetism. We show that inclusion of residual electronic interactions leads to an emergent spin-triplet superconducting state, which gets dramatically enhanced at the vicinity of the quasiperiodic critical point. Our results put forward quasiperiodicity as a powerful knob to engineer robust superconducting states, providing an alternative pathway towards artificially designed unconventional superconductors.
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Khosravian, M & Lado, J 2021, 'Quasiperiodic criticality and spin-triplet superconductivity in superconductor-antiferromagnet moiré patterns', Physical Review Research, vol. 3, no. 1, 013262, pp. 1-10. https://doi.org/10.1103/PhysRevResearch.3.013262