Momentum matching in the tunneling between 2-dimensional and 0-dimensional electron systems
Momentum matching in the tunneling between 2-dimensional and 0-dimensional electron systems
复制标题
二维和 0 维电子系统之间隧道效应的动量匹配
DOI：
10.1063/1.4728114
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发表时间：
2012
影响因子：
4
通讯作者：
A. Lorke
中科院分区：
文献类型：
--
作者：
A. Beckel;Daming Zhou;B. Marquardt;D. Reuter;A. Wieck;M. Geller;A. Lorke
我们研究了从二维电子气 (2DEG) 到自组装 InGaAs 量子点基态的隧道速率。这些速率受到垂直于隧道方向的磁场的强烈影响。令人惊讶的是，我们发现场的速率增加了 4 T，然后又再次下降。这可以通过量子点基态的特征动量与 2DEG 的费米动量 kF 之间的不匹配来解释。隧道概率的计算可以解释实验数据并允许我们确定点的几何形状以及 kF。
We investigate the tunneling rates from a 2-dimensional electron gas (2DEG) into the ground state of self-assembled InGaAs quantum dots. These rates are strongly affected by a magnetic field perpendicular to the tunneling direction. Surprisingly, we find an increase in the rates for fields up to 4 T before they decrease again. This can be explained by a mismatch between the characteristic momentum of the quantum dot ground state and the Fermi momentum kF of the 2DEG. Calculations of the tunneling probability can account for the experimental data and allow us to determine the dot geometry as well as kF.