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 . DOI: 10.1103/PhysRevB.89.085306
Physical Review. B, Condensed matter and materials physics
© 2014 American Physical Society
We acknowledge Navy/SPAWAR Grant N66001-09-1-2024, the Japan Society for the Promotion of Science (JSPS) through its “Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program),” and the State of Bavaria.
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