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Realization of Hofstadter's butterfly and a one-way edge mode in a polaritonic system
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Antal upphovsmän: 32018 (Engelska)Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, nr 7, artikel-id 075412Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2018. Vol. 98, nr 7, artikel-id 075412
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Fysik
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URN: urn:nbn:se:su:diva-160111DOI: 10.1103/PhysRevB.98.075412ISI: 000441463000005OAI: oai:DiVA.org:su-160111DiVA, id: diva2:1249070
Tillgänglig från: 2018-09-18 Skapad: 2018-09-18 Senast uppdaterad: 2022-02-26Bibliografiskt granskad

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Kyriienko, Oleksandr

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Nordiska institutet för teoretisk fysik (Nordita)
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Physical Review B
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