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Realization of Hofstadter's butterfly and a one-way edge mode in a polaritonic system
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 32018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 7, article id 075412Article in journal (Refereed) Published
Abstract [en]

We present a scheme to generate an artificial gauge field for the system of neutral bosons, represented by polaritons in micropillars arranged into a square lattice. The splitting between the two polarizations of the micropillars breaks the time-reversal symmetry (TRS) and results in the effective phase-dependent hopping between cavities. This can allow for engineering a nonzero flux on the plaquette, corresponding to an artificial magnetic field. Changing the phase, we observe a characteristic Hofstadter's butterfly pattern and the appearance of chiral edge states for a finite-size structure. For long-lived polaritons, we show that the propagation of wave packets at the edge is robust against disorder. Moreover, given the inherent driven-dissipative nature of polariton lattices, we find that the system can exhibit topological lasing, recently discovered for active ring cavity arrays. The results point to a static way to realize artificial magnetic field in neutral spinful systems, avoiding the periodic modulation of the parameters or strong spin-orbit interaction. Ultimately, the described system can allow for high-power topological single-mode lasing which is robust to imperfections.

Place, publisher, year, edition, pages
2018. Vol. 98, no 7, article id 075412
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-160111DOI: 10.1103/PhysRevB.98.075412ISI: 000441463000005OAI: oai:DiVA.org:su-160111DiVA, id: diva2:1249070
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2018-09-18Bibliographically approved

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Kyriienko, Oleksandr
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