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Evidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices.
Nat Commun
May 2024
Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
Article Synopsis
- Fermionic superfluidity with unique Cooper-pairing, beyond traditional theories, is an exciting area in quantum systems studying superconductivity.
- Researchers propose that nonreciprocal electron transport can effectively detect finite-momentum pairs, which is crucial as identifying these pairs has been challenging.
- The study reveals a new pairing state in a specific superconductor (CeCoIn) that shows distinct resistance anomalies in response to magnetic fields, suggesting intrinsic superconducting properties linked to helical superconductivity.
Superconducting Qubit Based on Twisted Cuprate Van der Waals Heterostructures.
Phys Rev Lett
January 2024
Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Van-der-Waals assembly enables the fabrication of novel Josephson junctions featuring an atomically sharp interface between two exfoliated and relatively twisted Bi_{2}Sr_{2}CaCu_{2}O_{8+x} (Bi2212) flakes. In a range of twist angles around 45°, the junction provides a regime where the interlayer two-Cooper pair tunneling dominates the current-phase relation. Here we propose employing this novel junction to realize a capacitively shunted qubit that we call flowermon.
View Article and Find Full Text PDFTopological nodal line in superfluid He and the Anderson theorem.
Nat Commun
July 2023
Department of Applied Physics, Aalto University, POB 15100, FI-00076, AALTO, Finland.
Superconductivity and superfluidity with anisotropic pairing-such as d-wave in cuprates and p-wave in superfluid He-are strongly suppressed by impurities. Meanwhile, for applications, the robustness of Cooper pairs to disorder is highly desired. Recently, it has been suggested that unconventional systems become robust if the impurity scattering mixes quasiparticle states only within individual subsystems obeying the Anderson theorem that protects conventional superconductivity.
View Article and Find Full Text PDFMechanism for fluctuating pair density wave.
Nat Commun
June 2023
Department of Physics, University of Florida, Gainesville, FL, USA.
In weakly coupled BCS superconductors, only electrons within a tiny energy window around the Fermi energy, E, form Cooper pairs. This may not be the case in strong coupling superconductors such as cuprates, FeSe, SrTiO or cold atom condensates where the pairing scale, E, becomes comparable or even larger than E. In cuprates, for example, a plausible candidate for the pseudogap state at low doping is a fluctuating pair density wave, but no microscopic model has yet been found which supports such a state.
View Article and Find Full Text PDFSinglet and triplet Cooper pair splitting in hybrid superconducting nanowires.
Nature
December 2022
QuTech and Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands.
In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not been conclusively identified, nor synthesized, despite promising progress.
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