קווזי-גבישים: מקפלר ועד שכטמן: מהארנבות של פיבונאצ'י ועד לנייר הטואלט שפנרוז לא אהב

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Abstract

The theory of crystallography had developed for centuries under the premise that crystals are necessarily periodic. No one had ever imagined that long-range order could be achieved by any other means. All this changed overnight, some 20 years ago, when the Israeli physicist Danny Shechtman discovered the first quasicrystal. Ever since Shechtman's discovery, crystallography has been in the midst of a scientific revolution, in which we are revising basic notions in condensed matter physics, such as the definition of "crystal" as well as the notions of "order" and "symmetry" in crystals and their implication on the physical properties of crystals.

In this article we shall try to explain, without going into too much detail, where we stand today on a number of these issues. We shall give the current definition of "crystal", demonstrate what aperiodic order might look like, and explain what it means to say that an aperiodic crystal has certain symmetry.
Original languageHebrew
JournalPhysicaPlus פיזיקהפלוס
Volume3
StatePublished - 2004

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