Ultraviolet Light Reveals Secrets of Nanoscale Electronic Materials

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Room-temperature Raman spectra of (1) a bare strontium titanate substrate (black curve) (2) a barium-titanatestrontium-titanate superlattice (bllue curve) measured with visible light and (3) the same superlattice measured with ultraviolet light (red ...
Room-temperature Raman spectra of (1) a bare strontium titanate substrate (black curve); (2) a barium-titanate/strontium-titanate superlattice (bllue curve) measured with visible light; and (3) the same superlattice measured with ultraviolet light (red curve). The dashed black line shows the bare strontium titanate substrate spectrum measured with ultraviolet light. Credit: Xiaoqing Pan, University of Michigan

An international team of scientists has used a novel technique to measure, for the first time, the precise conditions at which certain ultrathin materials spontaneously become electrically polarized. The research provides the fundamental scientific basis for understanding this "ferroelectric" state in materials needed for next-generation "smart card" memory chips and other devices. The research is published in a recent issue of the journal Science.


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