Lecturer: Mr. Avraham Klein
Affiliation: Racah Institute of Physics,
The Hebrew University of Jerusalem
Abstract:
Weakly coupled superfluids exhibit vortex
structures on scales much larger than the
typical interparticle separation. As a result,
their core can have structure. In fact, it
turns out that this structure is singular
despite the apparent topological protection
of vorticity quantization. This affects
dynamics in a fundamental manner.
Traditionally, vortices are expected to be
pinned to their surrounding flow. I will
describe how in fact vortices can have
long-lived excitations superimposed on the
flow pattern. Features of these excitations
include precession, spontaneous symmetry
breaking and chaos. I will show how the
Abrikosov lattice is unstable to structure
formation and exhibits a ferroelectric
phase.
Note: for those with deja vu from last
year's seminar – I will try to repeat myself
as little as possible.