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When a plasmon wave is excited in a metal, the displacement of electric charges is accompanied by the formation of a strong, oscillating 'internal field' (red arrow). This oscillating internal field acts back on the material itself to change its electronic properties, which in turn changes the character of the plasmonic wave itself. Credit: Rudner & Song.
Over the past decade, numerous physics studies have explored how oscillating electric fields produced by lasers or microwave sources can be used to dynamically alter the properties of materials on demand. In a new study featured in Nature Physics, two researchers at the University of Copenhagen and Nanyang Technological University (NTU), in Singapore, have built upon the findings of these studies, uncovering a mechanism through which a non-magnetic interacting metal can spontaneously magnetize.
Experiments - Nanoplasmonics - Electrons - Systems - Fact
"Recent experiments in nanoplasmonics have shown that when the electrons in nanoscale metallic systems are collectively excited, they can, in fact, produce extremely intense oscillating electric fields all on their own," Mark Rudner, one of the researchers who carried out the study, told Phys.org. "In light of this observation, we set out to uncover what new phenomena could arise when these 'internal fields' within a material feed back to change the properties of the material itself."
The internal fields that Rudner refers to are intense oscillating electric fields that originate from charge oscillations in a metal, known as plasmons. Plasmons are often used to confine light to length scales far below its original wavelength at a nanoscale, as well as to guide its propagation through devices. The detailed behavior of a plasmon (e.g. the frequency it oscillates at, its chirality, etc.) is directly dependent on a material's properties, such as its electronic bandstructure.
Specifics - Quantities - Material - Chosen - Type
"Typically, these material specifics are thought to be fixed quantities of the material chosen; to get a different type of plasmon...
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