Le Boité Alexandre, Orso Giuliano, Ciuti Cristiano
Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot-Paris 7 and CNRS, Bâtiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.
Phys Rev Lett. 2013 Jun 7;110(23):233601. doi: 10.1103/PhysRevLett.110.233601. Epub 2013 Jun 4.
We determine the steady-state phases of a driven-dissipative Bose-Hubbard model, describing, e.g., an array of coherently pumped nonlinear cavities with a finite photon lifetime. Within a mean-field master equation approach using exact quantum solutions for the one-site problem, we show that the system exhibits a tunneling-induced transition between monostable and bistable phases. We characterize the corresponding quantum correlations, highlighting the essential differences with respect to the equilibrium case. We also find collective excitations with a flat energy-momentum dispersion over the entire Brillouin zone that trigger modulational instabilities at specific wave vectors.
我们确定了一个受驱动耗散的玻色-哈伯德模型的稳态相，该模型描述了例如一系列具有有限光子寿命的相干泵浦非线性腔。在使用单格点问题的精确量子解的平均场主方程方法中，我们表明该系统在单稳态和双稳态相之间表现出隧穿诱导的转变。我们表征了相应的量子关联，突出了与平衡情况的本质区别。我们还发现了在整个布里渊区具有平坦能量-动量色散的集体激发，这些激发在特定波矢处引发调制不稳定性。
