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2017 ; 8
(ä): 14540
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Electrically tunable artificial gauge potential for polaritons
#MMPMID28230047
Lim HT
; Togan E
; Kroner M
; Miguel-Sanchez J
; Imamo?lu A
Nat Commun
2017[Feb]; 8
(ä): 14540
PMID28230047
show ga
Neutral particles subject to artificial gauge potentials can behave as charged
particles in magnetic fields. This fascinating premise has led to demonstrations
of one-way waveguides, topologically protected edge states and Landau levels for
photons. In ultracold neutral atoms, effective gauge fields have allowed the
emulation of matter under strong magnetic fields leading to realization of
Harper-Hofstadter and Haldane models. Here we show that application of
perpendicular electric and magnetic fields effects a tunable artificial gauge
potential for two-dimensional microcavity exciton polaritons. For verification,
we perform interferometric measurements of the associated phase accumulated
during coherent polariton transport. Since the gauge potential originates from
the magnetoelectric Stark effect, it can be realized for photons strongly coupled
to excitations in any polarizable medium. Together with strong
polariton-polariton interactions and engineered polariton lattices, artificial
gauge fields could play a key role in investigation of non-equilibrium dynamics
of strongly correlated photons.