How should one define a (weak) crystal? |
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| Authors: | A C D van Enter Jacek Miekisz |
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| Institution: | (1) Institute for Theoretical Physical, University of Groningen, P.O. Box 800, Groningen, The Netherlands |
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| Abstract: | We compare two proposals for the study of positional long-range order: one in terms of the spectrum of the translation operator, the other in terms of the Fourier spectrum. We point out that only the first one allows for the consideration of molecular, as opposed to atomic, (weakly) periodic structures. We illustrate this point on the Thue-Morse system. |
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| Keywords: | Positional long-range order Fourier spectrum spectrum of the shift |
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