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Superconductivity in Freestanding Infinite-Layer Nickelate Membranes.
Adv Mater
August 2024
National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China.
The observation of superconductivity in infinite-layer nickelates has attracted significant attention due to its potential as a new platform for exploring high-T superconductivity. However, thus far, superconductivity has only been observed in epitaxial thin films, which limits the manipulation capabilities and modulation methods compared to two-dimensional exfoliated materials. Given the exceptionally giant strain tunability and stacking capability of freestanding membranes, separating superconducting nickelates from the as-grown substrate is a novel way to engineer the superconductivity and uncover the underlying physics.
View Article and Find Full Text PDFGiant oscillations of diffusion in ac-driven periodic systems.
Chaos
November 2022
NTU "Kharkiv Polytechnic Institute," Kharkiv 61145, Ukraine.
We revisit the problem of diffusion in a driven system consisting of an inertial Brownian particle moving in a symmetric periodic potential and subjected to a symmetric time-periodic force. We reveal parameter domains in which diffusion is normal in the long time limit and exhibits intriguing giant damped quasiperiodic oscillations as a function of the external driving amplitude. As the mechanism behind this effect, we identify the corresponding oscillations of difference in the number of locked and running trajectories that carry the leading contribution to the diffusion coefficient.
View Article and Find Full Text PDFJosephson diode effect from Cooper pair momentum in a topological semimetal.
Nat Phys
August 2022
Max Planck Institute of Microstructure Physics, Halle (Saale), Germany.
Cooper pairs in non-centrosymmetric superconductors can acquire finite centre-of-mass momentum in the presence of an external magnetic field. Recent theory predicts that such finite-momentum pairing can lead to an asymmetric critical current, where a dissipationless supercurrent can flow along one direction but not in the opposite one. Here we report the discovery of a giant Josephson diode effect in Josephson junctions formed from a type-II Dirac semimetal, NiTe.
View Article and Find Full Text PDFZero-field polarity-reversible Josephson supercurrent diodes enabled by a proximity-magnetized Pt barrier.
Nat Mater
September 2022
Max Planck Institute of Microstructure Physics, Halle (Saale), Germany.
Simultaneous breaking of inversion and time-reversal symmetries in a conductor yields a non-reciprocal electronic transport, known as the diode or rectification effect, that is, low (ideally zero) conductance in one direction and high (ideally infinite) conductance in the other. So far, most of the diode effects observed in non-centrosymmetric polar/superconducting conductors and Josephson junctions require external magnetic fields to break the time-reversal symmetry. Here we report zero-field polarity-switchable Josephson supercurrent diodes, in which a proximity-magnetized Pt layer by ferrimagnetic insulating YFeO serves as the Rashba(-type) Josephson barrier.
View Article and Find Full Text PDFTunable Chiral Bound States with Giant Atoms.
Phys Rev Lett
January 2021
Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan.
We propose tunable chiral bound states in a system composed of superconducting giant atoms and a Josephson photonic-crystal waveguide (PCW), with no analog in other quantum setups. The chiral bound states arise due to interference in the nonlocal coupling of a giant atom to multiple points of the waveguide. The chirality can be tuned by changing either the atom-waveguide coupling or the external bias of the PCW.
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