Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Twisted interfaces between stacked van der Waals (vdW) cuprate crystals present a platform for engineering superconducting order parameters by adjusting stacking angles. Using a cryogenic assembly technique, we construct twisted vdW Josephson junctions (JJs) at atomically sharp interfaces between BiSrCaCuO crystals, with quality approaching the limit set by intrinsic JJs. Near 45° twist angle, we observe fractional Shapiro steps and Fraunhofer patterns, consistent with the existence of two degenerate Josephson ground states related by time-reversal symmetry (TRS). By programming the JJ current bias sequence, we controllably break TRS to place the JJ into either of the two ground states, realizing reversible Josephson diodes without external magnetic fields. Our results open a path to engineering topological devices at higher temperatures.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.abl8371 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Elastocaloric evidence for a multicomponent superconductor stabilized within the nematic state in Ba(FeCo)As.
Proc Natl Acad Sci U S A
September 2025
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305.
The iron-based high-[Formula: see text] superconductors (SCs) exhibit rich phase diagrams with intertwined phases, including magnetism, nematicity, and superconductivity. The superconducting [Formula: see text] in many of these materials is maximized in the regime of strong nematic fluctuations, making the role of nematicity in influencing the superconductivity a topic of intense research. Here, we use the AC elastocaloric effect (ECE) to map out the phase diagram of Ba(FeCo)As near optimal doping.
View Article and Find Full Text PDFRole of kinematic constraints in the time reversal symmetry breaking of a model active matter.
PNAS Nexus
September 2025
Laboratoire Charles Coulomb (L2C), Université de Montpellier and CNRS (UMR 5221), Montpellier 34095, France.
Active-matter systems are inherently out-of-equilibrium and perform mechanical work by utilizing their internal energy sources. Breakdown of time-reversal symmetry (BTRS) is a hallmark of such dissipative nonequilibrium dynamics. We introduce a robust, experimentally accessible, noninvasive, quantitative measure of BTRS in terms of the Kullback-Leibler divergence in collision events, demonstrated in our novel artificial active matter, comprised of battery-powered spherical rolling robots whose energetics in different modes of motion can be measured with high precision.
View Article and Find Full Text PDFTowards Floquet Chern insulators of light.
Nat Nanotechnol
September 2025
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, USA.
Topological photonics explores photonic systems that exhibit robustness against defects and disorder, enabled by protection from underlying topological phases. These phases are typically realized in linear optical systems and characterized by their intrinsic photonic band structures. Here we experimentally study Floquet Chern insulators in periodically driven nonlinear photonic crystals, where the topological phase is controlled by the polarization and the frequency of the driving field.
View Article and Find Full Text PDFUnbroken -symmetry in the absence of gain or loss.
Nat Commun
September 2025
Institute of Physics, University of Rostock, Albert-Einstein-Str. 23, 18059, Rostock, Germany.
The concept of parity-time symmetry has firmly established non-Hermiticity as a versatile degree of freedom on a variety of physical platforms. In general, the non-Hermitian dynamics of open systems are perceived to be inextricably linked to complex-valued potentials facilitating the local attenuation and coherent amplification in wave mechanics. Along these lines, time reversal symmetry is associated with a complex conjugation of the potential landscape, in essence swapping gain and loss.
View Article and Find Full Text PDFObservation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device.
Sci Adv
September 2025
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Topological superconductors are one of the intriguing material groups from the viewpoint of not only condensed matter physics but also industrial applications such as quantum computers based on Majorana fermion. For real applications, developments of thin-film topological superconductors are highly desirable. Bi/Ni bilayer is a possible candidate for thin-film chiral superconductors where the time-reversal symmetry is broken.
View Article and Find Full Text PDF