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A careful investigation of superconductivity in twisted trilayer graphene reveals a two-dome structure, which may be connected to intricate patterns of symmetry breaking in the underlying metallic state.
Electron correlations are important for superconductivity in layered copper oxides. Here, the authors use Auger photoelectron coincidence spectroscopy to directly determine the oxygen 2p hole-hole Coulomb energy in the undoped cuprate La2CuO4.
A materials platform using tantalum as a base layer and silicon as the substrate to construct superconducting qubits enables device performance improvements such as millisecond lifetimes and coherence times, as well as high time-averaged quality factors.
Symmetry-protected topological phases are special states of matter that rely on symmetries to exhibit unique, robust properties. This work explores how these properties can reappear even when the symmetry seems broken at small scales, using a model system where quantum fluctuations effectively “restore" the symmetry and revive topological behavior.
A superconducting layer placed between two ferromagnetic insulators can drive an antiferromagnetic exchange coupling between them. Here, the authors demonstrate that such an exchange coupling promotes non-volatile bistable memory states and repeatable “absolute” switching in GdN/V/GdN, where the device exhibits a superconducting transition only when the two ferromagnets have anti-parallel magnetization.
The epitaxial growth of hyperdoped Ga:Ge films and trilayer heterostructures by molecular-beam epitaxy yield superconductivity with a critical temperature of 3.5 K and may enable quantum functionalities in this material system, which is accessible with well-established semiconductor technologies.
Two-dimensional chiral superfluids couple to the geometry of the background substrate. As a consequence of this coupling, the authors demonstrate that thermal fluctuations of the substrate shape lead to a softening of vortex interactions, connecting the onset of the superfluid transition to the mechanical stability of the surface.
A careful investigation of superconductivity in twisted trilayer graphene reveals a two-dome structure, which may be connected to intricate patterns of symmetry breaking in the underlying metallic state.
Topologically protected surface states are expected to exist in topological superconductors. These states have now been detected using momentum-resolved tunnelling spectroscopy in a spin-triplet superconductor.
By tuning and mapping Josephson currents at the atomic scale, researchers uncover how competing superconducting phases in FeSe interfere, revealing the fingerprints of s±-wave pairing and frustrated Josephson coupling.
A crucial issue in condensed-matter physics is the assessment of superconducting diamagnetism in highly compressed hydrides. We propose a suitable reference sample that can be used to gain more consensus.
