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【Research News】Quantum twin spectra in nanocrystalline silicon

November 30,2017

Symmetries are important for elucidating nature of high energy- and condensed matter-physics. Discoveries of new symmetries have been innovating the whole area of science such as the construction of unified gauge theories and super string theories. A team of researchers from Nagoya City University, Japan Atomic Energy Agency, Chuo University, Rutherford Appleton Laboratory (U.K.), and High Energy Accelerator Research Organization, found a new quantum symmetry in the spectrum of nanocrystalline silicon (n-Si). The characteristic feature of the spectrum is the composition of homothetic spectral curves obtained by neutron-scattering and they name this feature "Quantum Twin Spectra". They suggested that this duality is not unique to n-Si but can also be observed other materials such as metal hydride alloys. They believe that this new symmetry would pave a way toward the solution for the mystery of deuterium stability (giant isotope effect [1]) and the development of new hydrogen storage materials.

[1] E. T. Foley, A. F. Kam, J. W. Lyding, and Ph. Avouris, "Cryogenic UHV-STM Study of Hydrogen and Deuterium Desorption from Si(100)," Phys. Rev. Lett. 80, 1336-1339 (1998).

Quantum Twin Spectra in Nanocrystalline Silicon

The model for the description of hydrogen dynamics with the silicon motion. Red- and aqua-spheres represent hydrogen and silicon atoms. Homothetic spectral curves (two parallel yellow lines) were obtained in the E-Q (E: energy, Q: momentum transfer) plane of neutron scattering spectra.

Published Online Date :October 10, 2017

Journal:Rapid Communication in Physical Review Materials

Title Quantum twin spectra in nanocrystalline silicon
Author Takahiro Matsumoto, Takashi Ohhara, Hidehiko Sugimoto, Stephen M. Bennington, and Susumu Ikeda
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