Observation of the Wannier-Stark fan and the fractional ladder in an accelerating optical lattice

被引：35

作者：

Madison, KW ^{[1
]}

Fischer, MC ^{[1
]}

Raizen, MG ^{[1
]}

机构：

[1] Univ Texas, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW A | 1999年 / 60卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.60.R1767

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report an experimental study of the Wannier-Stark fan and the fractional Wannier-Stark ladder using laser-cooled sodium atoms in an accelerating one-dimensional standing wave of light. We prepare the atoms in the lowest motional band of the optical lattice and then impose a constant acceleration. A weak oscillatory component is added to the acceleration in order to resonantly drive interband transitions, and the number of: atoms that remain in the lowest band is measured as a function of the probe frequency. The spectrum is characterized by a ladder of resonances spaced by the atomic Bloch oscillation frequency omega(B). When an additional, strong ac component at frequency Omega is added, a fractional ladder is observed with a spacing related to the electric matching ratio Omega/omega(B). [S1050-2947(99)51209-2].

引用

页码：R1767 / R1770

页数：4

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