f-band condensates in exciton-polariton lattice systems

Article

关键词: BOSE-EINSTEIN CONDENSATION;    MICROCAVITY;    TRANSITION;    TRAP;   

DOI  :  10.1103/PhysRevB.89.085306

来源: SCIE

【 摘 要 】

We report the condensation of microcavity exciton-polaritons at Gamma 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 Gamma 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 4f(y3-3x2y)-like orbital symmetry in real space. The f-orbital state at Gamma points appears as a metastable momentum valley to trap exciton-polaritons, which is explained by single-particle band-structure calculations.

【 授权许可】

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