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DC-powered microwave amplifiers approach the quantum noise limit by using the interaction between microwave radiation and inelastic Cooper-pair tunnelling across a voltage-biased Josephson junction.

A diode effect—asymmetric transport depending on its direction—is shown in the proximity-induced superconducting state of a Dirac semimetal.

Precise control over the quantum state of a two-dimensional Fermi gas together with single-particle-resolved fluorescence imaging enables the direct observation of the formation of Cooper pairs at the Fermi surface.

By pushing scanning tunnelling spectroscopy down to millikelvin temperatures, it is now possible to image a heavy fermion superconductor and measure the superconducting gap symmetry, with gap nodes in unexpected momentum-space locations.

Tunable moiré WSe₂ bilayers realize Hubbard-model physics, exhibiting antiferromagnetism, strange metals and superconducting domes, offering a controllable platform to study high-transition-temperature superconductivity.

Scanned Josephson tunnelling microscopy is used to image Cooper pair tunnelling from a superconducting microscope tip to the quantum condensate of Bi₂Sr₂CaCu₂O_8+x, thus revealing the spatially modulated density of Cooper pairs predicted from several theories of the cuprate pseudogap phase.

Recently, chiral superconductivity has been observed in rhombohedral tetralayer graphene under electron doping, arising from a spin- and valley-polarized normal state. Here, the authors propose a superconducting mechanism based on over-screening of Coulomb interaction due to charge fluctuations.

The impact of local magnetic impurities on superconducting order parameter remains largely unexplored. Here, the authors visualize the effect of different magnetic perturbations on a superconductor, unveiling a rich correlation of the interplay between quantum spins and superconductivity in different spectroscopic regimes.

The authors reveal an inherent trade-off between logarithmic average phonon frequency and the electron-phonon coupling constant in conventional BCS superconductors. The analysis suggests that achieving room-temperature conventional superconductivity at ambient pressure is extremely unlikely.

The second plateau in high-harmonic generation from liquids is due to off-site recombination of electrons, facilitated by the spatial delocalization of electron–hole wavefunctions.

Finding a parameter that limits the critical temperature of cuprate superconductors can provide crucial insight on the superconducting mechanism. Here, the authors use inelastic photon scattering on two Ruddlesden-Popper members of the model Hg-family of cuprates to reveal that the energy of magnetic fluctuations may play such a role, and suggest that the Cooper pairing is mediated by paramagnons.

Interaction between Cooper pairs and other collective excitations may reveal important information about the pairing mechanism. Here, the authors observe a universal jump in the phase of the driven Higgs oscillations in cuprate thin films, indicating the presence of a coupled collective mode, as well as a nonvanishing Higgs-like response at high temperatures, suggesting a potential nonzero pairing amplitude above Tc.

The authors introduce a new spectroscopic technique for studying Higgs modes in superconductors and apply it to a cuprate superconductor. The method involves a soft quench of the Mexican-Hat potential, populating Higgs modes of different symmetries, which are then probed by non equilibrium anti-Stokes Raman scattering.

Estimates from the Global Burden of Disease study reveal declines in chronic respiratory disease mortality between 1990 and 2023—especially during the COVID-19 pandemic—but the burdens on people affected remain substantial.

The ALICE Collaboration provides details on the microscopic mechanism that ends up creating antideuteron in high-energy proton–proton collisions at the Large Hadron Collider.

Weak transitions have a prominent role in optical clock devices and fundamental physics tests but are challenging to resolve due to the unfavourable scaling of the cross section with transition strengths. Here, the authors demonstrate enhanced cross sections due to beyond single-photon excitations in He atoms, facilitating applications in precision spectroscopy.

Identifying jets originating from heavy quarks plays a fundamental role in hadronic collider experiments. In this work, the ATLAS Collaboration describes and tests a transformer-based neural network architecture for jet flavour tagging based on low-level input and physics-inspired constraints.

Vortex dynamics and mutual friction in quantum fluids are intimately connected to the fundamental properties of superfluids. Here, the authors reveal previously unexplored mechanisms underlying the mutual friction coefficients in ultracold Fermi superfluids in the unitary limit, suggesting bound quasiparticles within the vortex core play a significant role.

The microscopic pairing mechanism in high-temperature superconductors remains debated. Here, the authors offer a new perspective on this problem by proposing that the strong pairing in Fermi-Hubbard type models relevant to cuprates is driven by a Feshbach resonance, which enhances interactions between doped holes.

The dynamical phases of out-of-equilibrium Bardeen–Cooper–Schrieffer superconductors have been simulated using cold atoms levitated inside an optical cavity.

Experimental evidence of coherent charge transport in the normal state of the kagome metal CsV₃Sb₅ is presented, revealing the nature of correlated order in kagome metals and new directions for exploring quantum coherence in correlated electron systems.

The injection of spin-polarized supercurrent into a ferromagnet presents the possibility of zero-resistance spintronic devices. Here, the authors evidence the direct injection of spin polarized supercurrent into ferromagnetic SrRuO₃ from a candidate spin-triplet superconductor Sr₂RuO₄.

The alloy bismuth-palladium is a candidate material for observing topological superconductivity. Here, the authors study the interplay of spin–orbit interactions and superconductivity in this noncentrosymmetric compound using scanning tunnelling spectroscopy and relativistic first-principles calculations.

Cooper pairs that form with finite centre-of-mass momentum are rare. Now there is evidence that this can happen below the Pauli limit in a bilayer material.

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.

Resonant magnetic excitations are common in unconventional superconductors, but the mechanism for their formation is elusive. Using inelastic neutron scattering, this study finds similar excitations in the non-superconducting heavy-fermion metal CeB₆, suggesting common behaviour between the two ground states.

The origin of intertwined electronic orders in transition-metal dichalcogenides has long been debated. Here, Bawden et al. report that the normal state, from which these phases emerge, is unexpectedly spin-polarized, with spins locked to both valley and layer pseudospins.

UTe₂ is a proposed intrinsic topological superconductor, but its quasiparticle surface band has not yet been visualized. Now this is achieved using quasiparticle interference imaging, revealing the symmetry of the superconducting order parameter.

A Josephson junction with a weak link made from the chiral antiferromagnet Mn₃Ge can act as a spin-triplet supercurrent spin valve.

Mode-selective vibrational excitations can be used to transiently induce a range of phenomena in strongly correlated states of matter. It is now shown that by exciting apical oxygen distortions in the cuprate system YBa₂Cu₃O_6.5, an unusual photoconductive effect is induced both at low and at high temperatures.

Characterizing the superconducting gap structure in the high-temperature superconductor H₃S by means of tunnelling spectroscopy reveals that it, as well as D₃S, has a fully gapped structure, confirming the phonon-mediated mechanism of superconducting pairing.

In the copper oxide superconductors, spin fluctuations might be involved in the electronic pairing mechanism. The case for such magnetically mediated superconductivity is now strengthened by the discovery of high-energy magnetic excitations that are not affected by chemical doping levels within several cuprates.

The tunnelling current in scanning tunnelling spectroscopy has often been treated by a continuous charge flow, which lacks proper treatment of charge quantization. Here, Ast et al. unveil the effects of granularity in the tunnelling current at extremely low temperatures by including P(E) theory, thereby reaching the quantum limit in scanning tunnelling spectroscopy.

Continuously changing the coupling between a magnetic impurity and a superconductor allows the observation of the reversal of supercurrent flow at the atomic scale.

Understanding “strange metal" behavior in high-temperature superconductors remains an open problem. Here the authors report a correlation between linear-in-magnetic-field magnetoresistance and linear-in-temperature resistivity in several hole-doped cuprate families and discuss its possible implications for superconductivity.

A triangular-lattice organic conductor κ-(BEDT-TTF)₄Hg_2.89 Br₈ is a promising doped spin liquid candidate which also exhibits superconductivity. Here the authors report thermoelectric measurements under pressure and find a quantum critical phase that could be correlated to BEC-like superconductivity.

This work reports on the observation of a large Josephson diode effect in a type-II Dirac semimetal 1T-PtTe₂. The magnitude of the Josephson diode effect is found to be related to an asymmetry of the critical supercurrent which is modeled as a phase shift between the first and second harmonic terms of the current-phase relationship and can be tuned by an external magnetic field.

By measuring terahertz photon echoes, multidimensional spectroscopy demonstrates that interlayer tunnelling in a cuprate superconductor remains largely unaffected by electronic disorder, even near the phase transition.

In this work, the authors investigate the distribution of holes with different magnetic quantum numbers in noble gas atoms, ionized by femtosecond and attosecond pulses. They achieve high control over hole alignment by adjusting pulse parameters and exploiting specific spectral features.

Insulator-to-metal transitions induced by spontaneous magnetization above room temperature have rarely been observed. Here, the authors show that this transition, along with concurrent high-temperature ferrimagnetic order, is realized in the novel 3d/5d hybridized quadruple perovskite oxide CaCu₃Ni₂Os₂O₁₂.

The authors report on an experimental study of attosecond time delays of photoelectrons emitted from CO₂ molecules. This clarifies the role of internal dynamics of ions and ionelectron entanglement on the photoionization dynamics.

Research on superconductivity in magic-angle twisted bilayer graphene reveals unconventional behaviour, an anisotropic gap and a significant role of quantum geometry, using combined d.c. transport and microwave measurements, suggesting new insights into superconductivity mechanisms.