F-band condensates in exciton-polariton lattice systems
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We report the condensation of microcavity exciton-polaritons at Γ points located on the boundary between the third and higher Brillouin zones in hexagonal lattices: triangular and honeycomb geometries. We collect experimental evidence that supports the finite momentum condensation: (1) the coherent Bragg peaks formed at nonzero Γ points; (2) the nonlinear intensity increase in the exciton-polariton emission at quantum degeneracy threshold; (3) the spectral linewidth behavior: narrowing near threshold and broadening above threshold; and (4) the equivalent 4fy3-3x2y-like orbital symmetry in real space. The f-orbital state at Γ points appears as a metastable momentum valley to trap exciton-polaritons, which is explained by single-particle band-structure calculations.
Kim , N Y , Kusudo , K , Löffler , A , Höfling , S , Forchel , A & Yamamoto , Y 2014 , ' F-band condensates in exciton-polariton lattice systems ' , Physical Review. B, Condensed matter and materials physics , vol. 89 , no. 8 . https://doi.org/10.1103/PhysRevB.89.085306
Physical Review. B, Condensed matter and materials physics
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