Bosonic Condensation and Disorder-Induced Localization in a Flat Band

We report on the engineering of a nondispersive (flat) energy band in a geometrically frustrated lattice of micropillar optical cavities. By taking advantage of the non-Hermitian nature of our system, we achieve bosonic condensation of exciton polaritons into the flat band. Because of the infinite e...

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Bibliographic Details
Published in:Physical review letters 2016-02, Vol.116 (6), p.066402-066402, Article 066402
Main Authors: Baboux, F, Ge, L, Jacqmin, T, Biondi, M, Galopin, E, Lemaître, A, Le Gratiet, L, Sagnes, I, Schmidt, S, Türeci, H E, Amo, A, Bloch, J
Format: Article
Language:English
Subjects:
Coherence
Condensation
Dissipation
Energy bands
Flats
Frustration
Holes
Phases
Physics
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Summary:We report on the engineering of a nondispersive (flat) energy band in a geometrically frustrated lattice of micropillar optical cavities. By taking advantage of the non-Hermitian nature of our system, we achieve bosonic condensation of exciton polaritons into the flat band. Because of the infinite effective mass in such a band, the condensate is highly sensitive to disorder and fragments into localized modes reflecting the elementary eigenstates produced by geometric frustration. This realization offers a novel approach to studying coherent phases of light and matter under the controlled interplay of frustration, interactions, and dissipation.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.066402