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Showing 1–11 of 11 results
Advanced filters: Author: Connor Occhialini Clear advanced filters

  • FeSe does not exhibit magnetic order and lacks a nematic quantum critical point coinciding with optimal superconductivity, suggesting that an orbital mechanism drives nematicity, but direct evidence is lacking. Here, combining X-ray linear dichroism with in situ uniaxial stress, the role of spontaneous orbital polarization in nematic-phase FeSe is determined.

    • Connor A. Occhialini
    • Joshua J. Sanchez
    • Riccardo Comin
    Research
    Nature Materials
    Volume: 22, P: 985-991

  • Multiple complementary optical signatures confirm the persistence of ferroelectricity and inversion-symmetry-breaking magnetic order down to monolayer NiI2, introducing the physics of type-II multiferroics into the area of van der Waals materials.

    • Qian Song
    • Connor A. Occhialini
    • Riccardo Comin
    Research
    Nature
    Volume: 602, P: 601-605

  • CrSBr, a van der Waals antiferromagnetic semiconductor, is used to fabricate photonic crystal slabs, featuring exceptional in situ control over optical behaviour and thus enabling precise manipulation of photonic modes at near-visible and infrared wavelengths.

    • Ahmet Kemal Demir
    • Luca Nessi
    • Riccardo Comin
    Research
    Nature Photonics
    Volume: 19, P: 1006-1012

  • Experimental observations and theoretical analysis provide evidence that the spin polarization of the spin-spiral type II multiferroic NiI2 exhibits p-wave magnetism and its spin chirality is related to ferroelectric polarization, which can be electrically controlled. 

    • Qian Song
    • Srdjan Stavrić
    • Riccardo Comin
    Research
    Nature
    Volume: 642, P: 64-70

  • Experimental evidence for charge coupling to ferroelectric soft mode is scarce. Here, the authors find a photogenerated coherent phonon coupling to the electronic transition above the bandgap in the van der Waals ferroelectric semiconductor NbOI2.

    • Chun-Ying Huang
    • Daniel G. Chica
    • Xiaoyang Zhu
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • Hydrostatic pressure is an underexplored tuning knob to study moiré systems. Here a MoS2/WSe2 heterostructure is compressed and the enhancement in the moiré potential strength is quantified via moiré-activated Raman modes.

    • Luiz G. Pimenta Martins
    • David A. Ruiz-Tijerina
    • Riccardo Comin
    Research
    Nature Nanotechnology
    Volume: 18, P: 1147-1153

  • Strongly correlated electron systems, such as the chromates, can exhibit a range of unique electronic configurations, the phase diagram of which can become even richer when considering non-equilibrium properties. Here, the authors apply ultrafast optical spectroscopy to α-Sr2CrO4 in order to investigate its spin and orbital ordering dynamics and the changes that occur when varying the pump photon energy.

    • Min-Cheol Lee
    • Connor Occhialini
    • Rohit P. Prasankumar
    ResearchOpen Access
    Communications Physics
    Volume: 5, P: 1-6

  • The discovery of a distant blazar J0410−0139 at z = 7 suggests that many similar sources existed in the early Universe, supporting the hypothesis that the rapid growth of black holes is driven by jet-enhanced or obscured accretion.

    • Eduardo Bañados
    • Emmanuel Momjian
    • Sofía Rojas-Ruiz
    ResearchOpen Access
    Nature Astronomy
    Volume: 9, P: 293-301

  • Images and spectroscopy obtained by the JWST from two HSC-SSP quasars show massive, compact and disc-like galaxies, indicating that the relation between black holes and their host galaxies was in place less than a billion years after the Big Bang.

    • Xuheng Ding
    • Masafusa Onoue
    • Jinyi Yang
    Research
    Nature
    Volume: 621, P: 51-55