Bandwidth-tuned Mott transition and superconductivity in twisted WSe2 Moiré materials built on transition metal dichalcogenide semiconductors have emerged as a programmable Hubbard model system. A natural question then arises: can such a system yield high-temperature superconductivity? In this talk, I will discuss the emergence of effectively high-temperature superconductivity near Mott transitions in twisted WSe2 with intermediate interaction strength. Remarkably, the emergent doping-temperature phase diagram resembles that in copper oxide superconductors. I will also discuss the evolution of the phase diagram as a function of gate-tuned displacement field that modifies the electronic band structure. The results could provide a new angle for understanding the phenomenon of high-temperature superconductivity in strongly correlated materials.

Revealing an unconventional superconducting state in layered PdBi$_2$ I will present our recent results on the layered superconductor β-PdBi$_2$, where tunneling spectroscopy under in-plane magnetic fields reveals a transition from conventional s-wave pairing to a nodal p-wave superconducting state. This sharp transition, marked by a discontinuous change in the tunneling spectra, occurs at a well-defined threshold field and originates from spin polarization and spin–momentum locking induced by locally broken inversion symmetry, which renders p-wave pairing energetically favorable at high fields. Remarkably, signatures of this transition also appear in magnetization, indicating the formation of a novel domain structure consisting of coexisting p-wave superconducting and normal regions. These findings offer a new experimental window into how spin textures, symmetry breaking, and strong spin–orbit coupling can stabilize unconventional superconductivity and generate emergent magnetic responses in layered materials.

Chiral Superconductivity and Fractional Quantum Anomalous Hall Effect in Graphene Fractional quantum Hall effect and superconductivity are two famous examples of emergent quantum phenomena driven by electron topology and correlations. They usually happen in very different materials and experimental settings. In this talk, I will discuss how they can be unified in one crystalline material, known as rhombohedral graphene. More than being hosted by the same materials, the settings challenge the conventional understandings of these phenomena: the fractional quantum Hall effect happens at zero magnetic field, while the superconductor behaves as a spin and orbital magnet. I will also discuss the implications of these phenomena in the context of non-Abelian quasiparticles and topological quantum computation.

Raman fingerprint of high-temperature superconductivity in compressed hydrides

• Francesco Mauri (Università di Roma, la Sapienza)

The discovery of high-temperature superconductivity in hydrogen-rich compounds under extreme pressures has prompted great excitement, intense research, but also debate over the past decade. In this study, we acquired unprecedented high-quality Raman spectra of hexagonal LaH10 at approximately 145 GPa and low temperatures, in conjunction with electrical transport measurements. Upon cooling, we observe a drop of resistivity and simultaneous remarkable variations of phonon frequencies and linewidths. These effects are interpreted and perfectly reproduced by the Migdal–Eliashberg theory, providing a definitive proof of phonon-mediated superconductivity and enabling a quantitative determination of the superconducting energy gap. Our results establish Raman spectroscopy as a robust, contact-free probe with micrometric resolution for studying high temperature superconductivity, opening a powerful route to its discovery and characterization. We acknowledge financial support from the European Union ERC-SYN MORE-TEM no. 951215 (F.M., L.B., P.B. and G.M.).

Exploration of 2D Material Membranes with High Ion Conductivities Solid electrolytes are promising candidates for safe, high-energy power systems. Composite electrolytes hold the potential to combine high ionic conductivity with stable electrode interfaces. However, a fundamental trade-off often exists between ion conduction and mechanical properties. First, we found that 2D materials show excellent ionic conductivity along 2D channels. Second, we introduce a composite electrolyte design that decouples ion conduction from mechanical flexibility, achieving a high ionic conductivity of 10.2 mS cm-1 at room temperature. The architecture features alternating layers of perpendicularly aligned 2D Li0.3Cd0.85PS3 (PA-LiCdPS) to create continuous superionic conduction pathways and polyethylene oxide (PEO) for flexibility and improved interfacial compatibility. This PA-LiCdPS/PEO electrolyte enables Li||LiNi0.8Co0.1Mn0.1O2 coin cells (stack pressure <0.5 MPa) to have high electrochemical performance. Finally, we have designed and synthesized a sieving 2D solid state organic electrolytes with mixed planes and vertical nanochannels, which can be scaled up and shows high environmental tolerance and temperature stability, for practical solid-state batteries.

Design and application of conjugated nanohoops displaying antiaromaticity, chirality or redox activity With their bent π-system and radially oriented p-orbitals, conjugated nanohoops are intriguing compounds, both from the synthetic point of view as well as for electronics applications. In this talk I will present on the design and synthesis of conjugated nanohoops incorporating antiaromatic panels, of chiral and redox-active nanohoops as well as on their optoelectronic properties, supramolecular host-guest studies and application for energy storage in batteries.

Nanographenes as single quantum emitters Nanographenes synthesized by bottom-up chemistry are tunable emitters with promises in optoelectronic and quantum technologies. Recent investigations have classified them as stable and bright single-photon sources [1-4]. The next step towards using nanographenes as quantum emitters is to reach a lifetime-limited linewidth. Inspired by pioneering works on small organic molecules [6], we designed a new guest-host system to decouple the nanographene from its local environment [7]. In addition, we also test hBN as a substrate for Nanographenes. This presentation will showcase our recent results on the low-temperature spectroscopy of new nanographenes [5], either embedded in a novel molecular crystal host [7] or deposited on hBN [8]. References [1] Levy-Falk, Hugo, et al. physica status solidi (b) (2023). [2] S. Zhao et al, Nature Communications, 9, 3470 (2018) [3] T. Liu et al, Nanoscale, 14, 3826 – 3833 (2022) [4] T. Liu et al, Journal of Chemical Physics 156, 104302 (2022) [5] D. Medina-Lopez et al, Nature Communications 14, 4728 (2023) [6] WP. Ambrose et al J. Chem. Phys. 95 (10), 7150–7163 (1991) [7] Huynh Thanh Trung et al, in preparation [8] S. Sarkar et al, in preparation