Electronically polarized systems are physical systems in which the electronic charge distribution is displaced relative to the nuclei, producing a net electric polarization that can be static, induced, or dynamic. This polarization arises from external electric fields, internal crystal fields, broken inversion symmetry, interfaces, or collective electronic instabilities, and is described microscopically by changes in electronic wavefunctions and macroscopically by a polarization vector field. Such systems include dielectrics, ferroelectrics, polar semiconductors, and heterostructures where bound or itinerant electrons respond anisotropically, strongly influencing dielectric response, excitations, screening, charge transport, and nonlinear optical properties central to condensed-matter and materials physics.
A team of researchers at The University of Manchester's National Graphene Institute (NGI) and the National Physical Laboratory (NPL) has demonstrated that slightly twisted 2D transition metal dichalcogenides (TMDs) display ...
Nanomaterials
Mar 3, 2022
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169
Ferromagnetic materials have a self-generating magnetic field, ferroelectric materials generate their own electrical field. Although electric and magnetic fields are related, physics tells us that they are very different ...
Nanophysics
Feb 9, 2022
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2240
Graphene is a carbon material that forms extremely thin layers. Because of its unusual properties, it is interesting for many technical applications. This also applies to polycyclic aromatic hydrocarbons (PAHs), which can ...
Nanomaterials
Feb 7, 2022
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85
Bulk photovoltaic effect (BPVE) is widely used in generating electricity. As a process of energy transference from photons to electrons and of voltage formation within ferroelectric material, BPVE acts like a dam, raising ...
Nanomaterials
Oct 20, 2021
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103
Molecular interfaces formed between metals and molecular compounds have enormous potential as building blocks for future opto-electronics and spin-electronics devices. Transition metal phthalocyanine and porphyrin complexes ...
Nanophysics
Oct 19, 2021
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279
A new generation of electronics and optoelectronics may soon be possible by controlling twist angles in a particular type of bilayer 2D material used in these devices, strengthening the intrinsic electric charge that exists ...
Nanomaterials
Oct 14, 2021
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126
Colorful organic materials have fascinated scientists already for more than 200 years. The color of an organic material typically arises from light-matter-interactions that involve electronic transitions such as charge transfer ...
Bio & Medicine
Jun 23, 2021
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