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2015 ; 6
(ä): 8981
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Fractionally charged skyrmions in fractional quantum Hall effect
#MMPMID26608906
Balram AC
; Wurstbauer U
; Wójs A
; Pinczuk A
; Jain JK
Nat Commun
2015[Nov]; 6
(ä): 8981
PMID26608906
show ga
The fractional quantum Hall effect has inspired searches for exotic emergent
topological particles, such as fractionally charged excitations, composite
fermions, abelian and nonabelian anyons and Majorana fermions. Fractionally
charged skyrmions, which support both topological charge and topological
vortex-like spin structure, have also been predicted to occur in the vicinity of
1/3 filling of the lowest Landau level. The fractional skyrmions, however, are
anticipated to be exceedingly fragile, suppressed by very small Zeeman energies.
Here we show that, slightly away from 1/3 filling, the smallest manifestations of
the fractional skyrmion exist in the excitation spectrum for a broad range of
Zeeman energies, and appear in resonant inelastic light scattering experiments as
well-defined resonances slightly below the long wavelength spin wave mode. The
spectroscopy of these exotic bound states serves as a sensitive tool for
investigating the residual interaction between composite fermions, responsible
for delicate new fractional quantum Hall states in this filling factor region.
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