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To Be or Not To Be Polar: The Ferroelectric and Antiferroelectric Nematic Phases
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Solvated Electrons in Solids—Ferroelectric Large Polarons in Lead Halide Perovskites
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Local atomic order and hierarchical polar nanoregions in a classical relaxor ferroelectric
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Strain-induced room-temperature ferroelectricity in SrTiO3 membranes
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Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals
To alleviate the energy and environmental crisis, in the last decades, energy harvesting by utilizing optical control has emerged as a promising solution. Here we report a polar crystal that exhibits photoenergy conversion and energy storage upon light irradiation. The polar crystal consists of dinuclear [CoGa] molecules, which are oriented in a uniform direction inside the crystal lattice. Irradiation with green light induces a directional intramolecular electron transfer from the ligand to a low-spin Co III centre, and the resultant light-induced high-spin Co II excited state is trapped at low temperature, realizing energy storage. Additionally, electric current release is observed during relaxation from the trapped light-induced metastable state to the ground state, because the intramolecular electron transfer in the relaxation process is accompanied with macroscopic polarization switching at the single-crystal level. It demonstrates that energy storage and conversion to electrical energy is realized in the [CoGa] crystals, which is different from typical polar pyroelectric compounds that exhibit the conversion of thermal energy into electricity.
Unveiling the Pockels coefficient of ferroelectric nitride ScAlN
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Ferroelectricity at the extreme thickness limit in the archetypal antiferroelectric PbZrO3
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Melting of charge order in the low-temperature state of an electronic ferroelectric-like system
Strong electronic interactions can drive a system into a state with a symmetry breaking. Lattice frustration or competing interactions tend to prevent symmetry breaking, leading to quantum disordered phases. In spin systems frustration can produce a spin liquid state. Frustration of a charge degree of freedom also can result in various exotic states, however, experimental data on these effects is scarce. In this work we demonstrate how in a Mott insulator on a weakly anisotropic triangular lattice a charge ordered state melts on cooling down to low temperatures. Raman scattering spectroscopy finds that κ -(BEDT-TTF) 2 Hg(SCN) 2 Cl enters an insulating “dipole solid” state at T =30K, but below T =15K the order melts, while preserving the insulating energy gap. Based on these observations, we suggest a phase diagram relevant to other quantum paraelectric materials.
Dzyaloshinskii–Moriya-like interaction in ferroelectrics and antiferroelectrics
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Electro-thermal actuation in percolative ferroelectric polymer nanocomposites
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Interfacial ferroelectricity in rhombohedral-stacked bilayer transition metal dichalcogenides
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Electrically switchable anisotropic polariton propagation in a ferroelectric van der Waals semiconductor
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