集体声子激发引起的光晶格绝缘态的不稳定性
Instability of insulating states in optical lattices due to collective phonon excitations
摘要：
研究了集体声子激发对光晶格中冷原子性质的影响。这些声子激发是集体激发，它们的出现是由原子间相互作用引起的，如果没有这种相互作用，它们就不会出现。这些集体激发不应与由外力产生的晶格振动相混淆。假设没有这样的力量。但考虑的声子是纯粹的自组织集体激发，表征原子振荡周围的晶格网站，由于网站间的原子相互作用。结果表明，这些激发可以从根本上影响原子被本地化的可能性。在没有声子激发的情况下绝缘的状态可以在考虑这些激发时变得离域。这既涉及原子的长程相互作用，也涉及原子的局域相互作用。为了表征稳定区域，使用Lindemann准则。
英文摘要：
The role of collective phonon excitations on the properties of cold atoms in optical lattices is investigated. These phonon excitations are collective excitations, whose appearance is caused by intersite atomic interactions correlating the atoms, and they do not arise without such interactions. These collective excitations should not be confused with lattice vibrations produced by an external force. No such a force is assumed. But the considered phonons are purely self-organized collective excitations, characterizing atomic oscillations around lattice sites, due to intersite atomic interactions. It is shown that these excitations can essentially influence the possibility of atoms to be localized. The states that would be insulating in the absence of phonon excitations can become delocalized when these excitations are taken into account. This concerns long-range as well as local atomic interactions. To characterize the region of stability, the Lindemann criterion is used.
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。
