Inhibition of tunneling and edge state control in polariton topological insulators
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We address the inhibition of tunneling in polariton condensates confined in a potential landscape created by a honeycomb array of microcavity pillars in the presence of spin- orbit coupling and Zeeman splitting in the external magnetic field. The coupling rate between the microcavity pillars can be strongly impacted even by weak out-of-phase temporal modulations of the depths of the corresponding potential wells. When such a modulation is implemented in truncated honeycomb arrays that realize a polari- ton topological insulator, which supports unidirectional edge states in the presence of spin-orbit coupling and Zeeman splitting, it allows controlling the velocity of the states. The origin of the phenomenon is the dynamical modulation with a proper fre- quency, which notably changes the dispersion of the system and the group velocity of edge states. We show that such a control is possible for modulation frequencies close to resonances for the inhibition of tunneling in a two-well configuration. Edge states considerably slow down, and even stop completely, when the modulation frequency approaches a resonant value, while above such a frequency, splitting of the edge states into wavepackets moving with different velocities occurs
CitationZhang, Y., Kartashov, Y.V., Zhang, Y., Torner, L., Skryabin, D. Inhibition of tunneling and edge state control in polariton topological insulators. "APL Photonics", 1 Desembre 2018, vol. 3, p. 1-9.