物理
极化子
过剩
玻色-爱因斯坦凝聚体
凝聚态物理
束缚态
介观物理学
拓扑量子数
光子
量子力学
作者
Vincenzo Ardizzone,Fabrizio Riminucci,Simone Zanotti,Antonio Gianfrate,D. G. Suárez-Forero,Francesco Todisco,Milena De Giorgi,D. Trypogeorgos,Giuseppe Gigli,Hai Son Nguyen,K. W. Baldwin,L. N. Pfeiffer,Dario Ballarini,Dario Gerace,D. Sanvitto
出处
期刊:Nature
[Springer Nature]
日期:2022-05-18
卷期号:605 (7910): 447-452
被引量:41
标识
DOI:10.1038/s41586-022-04583-7
摘要
Bound states in the continuum (BICs)1-3 are peculiar topological states that, when realized in a planar photonic crystal lattice, are symmetry-protected from radiating in the far field despite lying within the light cone4. These BICs possess an invariant topological charge given by the winding number of the polarization vectors5, similar to vortices in quantum fluids such as superfluid helium and atomic Bose-Einstein condensates. In spite of several reports of optical BICs in patterned dielectric slabs with evidence of lasing, their potential as topologically protected states with theoretically infinite lifetime has not yet been fully exploited. Here we show non-equilibrium Bose-Einstein condensation of polaritons-hybrid light-matter excitations-occurring in a BIC thanks to its peculiar non-radiative nature, which favours polariton accumulation. The combination of the ultralong BIC lifetime and the tight confinement of the waveguide geometry enables the achievement of an extremely low threshold density for condensation, which is reached not in the dispersion minimum but at a saddle point in reciprocal space. By bridging bosonic condensation and symmetry-protected radiation eigenmodes, we reveal ways of imparting topological properties onto macroscopic quantum states with unexplored dispersion features. Such an observation may open a route towards energy-efficient polariton condensation in cost-effective integrated devices, ultimately suited for the development of hybrid light-matter optical circuits.
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