Laboratoire de Physique des Lasers, CNRS UMR 7538, Université Paris 13, 99 Avenue J.-B. Clément, 93430 Villetaneuse, France.
Phys Rev Lett. 2011 Jan 7;106(1):015301. doi: 10.1103/PhysRevLett.106.015301. Epub 2011 Jan 5.
We observe interband transitions mediated by dipole-dipole interactions for an array of 1D quantum gases of chromium atoms, trapped in a 2D optical lattice. Interband transitions occur when dipolar relaxation releases an energy larger than the lattice band gap. For symmetric lattice sites, and a magnetic field parallel to the lattice axis, we compare the measured dipolar relaxation rate with a Fermi golden rule calculation. Below a magnetic field threshold, we obtain an almost complete suppression of dipolar relaxation, leading to metastable 1D gases in the highest Zeeman state.
我们观察到由偶极-偶极相互作用介导的带间跃迁，该跃迁发生在一个由被囚禁在二维光学晶格中的铬原子一维量子气体的体系中。当偶极弛豫释放的能量大于晶格能带隙时，就会发生带间跃迁。对于对称的晶格位置和与晶格轴平行的磁场，我们将测量到的偶极弛豫率与费米黄金定则计算进行了比较。在磁场阈值以下，我们几乎完全抑制了偶极弛豫，从而导致在最高塞曼态下的亚稳态一维气体。
