Phonon Number Fluctuations in One-Dimensional Fermi-Pasta-Ulam Lattices
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概要
- 論文の詳細を見る
We study the long-term behacior of one-dimensional Fermi-Pasta-Ulam lattices by varying the system size and the degree of nonlinearity. The power spectral density of the lowest mode energy obeys the power law P(f)∝1/f^α over a wide range of frequencies: fs≲f∼f_1, where f_1 is the lowest mode frequency. In the low frequency region f∼f_s, white spectra are observed. The shoulder frequency fs first increases and then decreases as the system size increases, which can be qualitatively explained in terms of two competing factors. If the system is not very small, the spectrum is Lorentzian at low frequencies, i.e., the spectral exponent α is closer to 2 than 1.
- 社団法人応用物理学会の論文
- 1996-04-15
著者
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Choi Donghak
Department Of Physics Tokyo Metropolitan University
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Kawamura H
Himeji Inst. Technol. Hyogo Jpn
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FUCHIKAMI Nobuko
Department of physics, Faculty of Science, Tokyo Metropolitan University
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KAWAMURA Hisanori
Department of Physics, Tokyo Metropolitan University
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ISHIOKA Shunya
Department of Information Science, Kanagawa University at Hiratsuka
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Fuchikami Nobuko
Department Of Physics Faculty Of Science Tokyo Metropolitan University
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Ishioka Shunya
Department Of Information Science Kanagawa University At Hiratsuka
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Ishioka Shunya
Department Of Information Science Kanagawa University
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Kawamura Hideki
Department of Physical Science, Graduate School of Engineering Science, Osaka University:Core Research for Evolutional Science & Technology (CREST), Japan Science and Technology Corporation
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