What is a Quasicrystal?

July 23, 2013

3:30 pm - 4:30 pm

CH-232

2013-07-23 15:30:00 2013-07-23 16:30:00 What is a Quasicrystal? SpeakerYounghwan SonAbstractIn 1982 D. Shechtman (the 2011 Nobel Laureate in Chemistry) discovered a type of crystal (now called a quasicrystal) that disagreed with the prevailing views on the atomic structure of materials.  Previously, the conventional view was that crystals have a periodic atomic arrangement whose X-ray diffraction pattern should obey certain special rotational symmetries.  That is known as the classical crystallographic restriction theorem.  However, the X-ray diffraction spectrum of quasicrystals has sharp spots called Bragg peaks and non-crystallographic symmetries, which is indicative of aperiodic structures with long range order.  This discovery has inspired a lot of research on the structures of mathematical quasicrystals. In this talk we will consider some relevant conditions to model mathematical quasicrystals.For more information, see the What Is... ? Seminar page. CH-232 America/New_York public

Younghwan Son

In 1982 D. Shechtman (the 2011 Nobel Laureate in Chemistry) discovered a type of crystal (now called a quasicrystal) that disagreed with the prevailing views on the atomic structure of materials. Previously, the conventional view was that crystals have a periodic atomic arrangement whose X-ray diffraction pattern should obey certain special rotational symmetries. That is known as the classical crystallographic restriction theorem. However, the X-ray diffraction spectrum of quasicrystals has sharp spots called Bragg peaks and non-crystallographic symmetries, which is indicative of aperiodic structures with long range order. This discovery has inspired a lot of research on the structures of mathematical quasicrystals. In this talk we will consider some relevant conditions to model mathematical quasicrystals.

For more information, see the What Is... ? Seminar page.