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CATEGORIES:Theoretical Physics Seminars
SUMMARY:Ultracold atoms in optical quasicrystals: Localiza
tion\, Fractal Structures and Synthetic Dimensions
- Ulrich Schneider (Cambridge)
DTSTART:20200206T131500Z
DTEND:20200206T144500Z
UID:TALK4088AT
URL:/talk/index/4088
DESCRIPTION:Quasicrystals are a novel form of condensed matter
that is not periodic\, but nonetheless long-range
ordered. Similar to periodic crystals\, quasicrys
tals give rise to diffraction patterns consisting
of sharp Bragg peaksâ€”but with rotational symmetrie
s forbidden for periodic structures. They can be d
escribed by self-similar\, fractal tilings contain
ing more than one type of unit cell\, such as the
celebrated Penrose tiling. Many foundational conc
epts of periodic systems such as Blochwaves or Bri
llouin zones are not applicable to quasicrystals\,
thereby giving rise to new physics. Examples incl
ude many-body localization\, phasonic degrees of f
reedom\, fractal band structures\, and a direct li
nk to higher dimensions via cut-and-project techni
ques\, where quasicrystals can inherit topological
properties from their periodic parents.\nIn this
talk\, I will present our experimental realization
of an eightfold symmetric optical quasicrystal fo
r ultracold atoms. Matter-wave diffraction directl
y reveals the self-similar fractal nature of this
potential and realizes quantum walks in up to four
synthetic dimensions. I will also present the loc
alization transition in these potentials and close
by discussing the prospect for the 2D Bose glass
and Many-body localization in these potentials.
LOCATION:Theory Library
CONTACT:Dr Hannah Price
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