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arXiv 1702.07653quant-phcond-mat.quant-gas
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冷原子通过光子介导的长程力相互作用的相位

Phases of cold atoms interacting via photon-mediated long-range forces

Tim Keller, Simon B. Jäger, Giovanna Morigi

摘要:

高精细光学谐振腔中的原子通过它们倍增散射到腔模中的光子相互作用。动态的特点是色散和耗散的光机械长程力,这是介导的腔光子,并表现出一定的参数制度的稳定状态。在驻波腔中,原子可以形成稳定的空间光栅。此外,它们的渐近分布是Maxwell-Boltzmann分布,其有效温度由激光参数控制。本文证明了双模驻波腔中的定态具有与正则系综中的广义哈密顿平均场模型相同的性质和相位。这个模型有三个平衡相:顺磁相、磁相和铁磁相,它们对应于原子气体的不同空间顺序,可以通过腔发出的光来检测。我们进一步讨论了在这种设置中的广义哈密顿平均场模型预测的系综不等价性的调查前景。

英文摘要:

Atoms in high-finesse optical resonators interact via the photons they multiply scatter into the cavity modes. The dynamics is characterized by dispersive and dissipative optomechanical long-range forces, which are mediated by the cavity photons, and exhibits a steady state for certain parameter regimes. In standing-wave cavities the atoms can form stable spatial gratings. Moreover, their asymptotic distribution is a Maxwell-Boltzmann whose effective temperature is controlled by the laser parameters. In this work we show that in a two-mode standing-wave cavity the stationary state possesses the same properties and phases of the Generalized Hamiltonian Mean Field model in the canonical ensemble. This model has three equilibrium phases: a paramagnetic, a nematic, and a ferromagnetic one, which here correspond to different spatial orders of the atomic gas and can be detected by means of the light emitted by the cavities. We further discuss perspectives for investigating in this setup the ensemble inequivalence predicted for the Generalized Hamiltonian Mean Field model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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