Materials Science Institute, University of Valencia, PO Box 22085, ES46071 Valencia, Spain.
Phys Rev Lett. 2010 Apr 23;104(16):165502. doi: 10.1103/PhysRevLett.104.165502.
We present the experimental observation of Bloch oscillations, the Wannier-Stark ladder, and Landau-Zener tunneling of surface acoustic waves in perturbed grating structures on a solid substrate. A model providing a quantitative description of our experimental observations, including multiple Landau-Zener transitions of the anticrossed surface acoustic Wannier-Stark states, is developed. The use of a planar geometry for the realization of the Bloch oscillations and Landau-Zener tunneling allows a direct access to the elastic field distribution. The vertical surface displacement has been measured by interferometry.
我们展示了在固体基底上的微扰光栅结构中，表面声波的布洛赫振荡、魏格纳-斯塔克阶梯和朗道-泽纳隧穿的实验观察结果。我们提出了一个模型，对实验观测结果进行了定量描述，包括交叉表面声波魏格纳-斯塔克态的多次朗道-泽纳跃迁。布洛赫振荡和朗道-泽纳隧穿的平面几何结构的应用使得可以直接获得弹性场分布。通过干涉测量法测量了垂直表面位移。
