磁悬臂梁耦合玻色-爱因斯坦凝聚体的声子Laser效应和Dicke-Hepp-Lieb超辐射相变
Phonon Laser Effect and Dicke-Hepp-Lieb Superradiant Phase Transition in Magnetic Cantilever Coupled to a Bose Einstein Condensate
摘要：
我们提出了一种声子激光器的可能性耦合玻色-爱因斯坦凝聚体的纳米机械悬臂与磁性尖端。由于磁耦合，原子自旋翻转诱导悬臂梁运动，可用于产生声子激光。该系统是由等效的Jaynes-Cummings哈密顿。通过控制原子数和粒子数反转，可以获得连续激光或瞬态激光。两体原子-原子相互作用也被证明是相干操纵激光过程。我们还发现在强耦合极限下，同一系统可以发生Dicke-Hepp-Lieb超辐射相变。通过调节两体原子-原子相互作用可以得到奇异相图。
英文摘要：
We propose a possibility of a phonon laser by coupling a Bose-Einstein condensate to a nanomechanical cantilever with a magnetic tip. Due to the magnetic coupling, atomic spin flips induce cantilever motion which can be used to produce a phonon laser. The system is described by the equivalent of the Jaynes-Cummings Hamiltonian. By controlling the number of atoms and the population inversion, one can obtain either a continuous wave (cw) or transient lasing. The two-body atom-atom interaction is also shown to coherently manipulate the lasing process. We also show that in the strong coupling limit, the same system can undergo a Dicke-Hepp-Lieb superradiant phase transition. Exotic phase diagrams can be obtained by tuning the two body atom-atom interaction.
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