Experimental and theoretical demonstration of acoustic Bloch oscillations in porous silicon structures
Experimental and theoretical demonstration of acoustic Bloch oscillations in porous silicon structures
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DOI：
10.1063/1.4871535
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发表时间：
2014-04
影响因子：
3.2
通讯作者：
Z. Lazcano;J. Arriaga;G. N. Aliev
中科院分区：
文献类型：
--
作者：
Z. Lazcano;J. Arriaga;G. N. Aliev
本文报道了基于多孔硅的线性倾斜多层膜结构中的声Bloch振荡和Wannier-Stark阶梯的理论计算和实验验证。所考虑的结构由具有恒定孔隙率的层与具有线性梯度的层交替组成，所述线性梯度的参数η=1/vL 2沿着生长方向，以便倾斜声学带隙。这种梯度的目的是模仿在外部电场下的超晶格半导体的倾斜电子能带结构。以这种方式，声学Wannier-Stark阶梯的等距模式的形成，并在1.2 GHz附近的透射谱实验证实。它们的频率间隔定义了声学布洛赫振荡的周期。我们制作了三种不同的结构，具有相同的厚度，但不同的η参数值，以观察对布洛赫振荡周期的影响。我们测量了声波的透射谱...
We report the theoretical calculations and the experimental demonstration of acoustic Bloch oscillations and Wannier-Stark ladders in linear tilted multilayer structures based on porous silicon. The considered structures consist of layers with constant porosity alternated by layers with a linear gradient in the parameter η=1/vL2 along the growth direction in order to tilt the acoustic band gap. The purpose of this gradient is to mimic the tilted electronic miniband structure of a superlattice semiconductor under an external electric field. In this way, acoustic Wannier-Stark ladders of equidistant modes are formed and they were experimentally confirmed in the transmission spectrum around 1.2 GHz. Their frequency separation defines the period of the acoustic Bloch oscillations. We fabricated three different structures with the same thicknesses but different values in the η parameter to observe the effect on the period of the Bloch oscillations. We measured the acoustic transmission spectra in the frequency...