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CATEGORIES:DAMTP Statistical Physics and Soft Matter Seminar
SUMMARY:Quasicrystals with hexagonal symmetry and other pa
tterns in soft-matter - Andy Archer (Loughborough
University London)
DTSTART;TZID=Europe/London:20240123T130000
DTEND;TZID=Europe/London:20240123T140000
UID:TALK209734AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/209734
DESCRIPTION:\nFor soft-matter to form quasicrystals\, an impor
tant ingredient is to have two characteristic leng
th scales in the interparticle interactions. To be
more precise\, for stable quasicrystals\, periodi
c modulations of the local density distribution wi
th two particular wave numbers should be favoured\
, and the ratio of these wave numbers should be cl
ose to certain special values. In simple model sys
tems\, only these two wave numbers are needed. How
ever\, for more realistic models\, where in princi
ple all wave numbers can be involved\, other wave
numbers are also important\, specifically those of
the second and higher reciprocal lattice vectors.
We identify features in the particle pair interac
tion potentials that can suppress or encourage den
sity modes with wave numbers associated with one o
f the regular crystalline orderings that compete w
ith quasicrystals\, enabling either the enhancemen
t or suppression of quasicrystals in a generic cla
ss of systems. Our strategy for finding quasicryst
als involves tuning locations of maxima in the dis
persion relation\, or equivalently in the liquid s
tate partial static structure factors. We also ext
end our approach to obtain some other quasicrystal
s\, including the bronze mean structure\, having a
hexagonal symmetry and a new related quasicrystal
. I will finish with a discussion of recent relate
d work investigating one-component systems of core
-shell particles that for some parameter values ex
hibit phase diagrams with 20+ different patterned
phases.
LOCATION:Center for Mathematical Sciences\, Lecture room MR
4
CONTACT:Sarah Loos
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