EXPERIMENTAL EVIDENCE FOR COULOMB CHARGING EFFECTS IN AN OPEN QUANTUM DOT AT ZERO MAGNETIC FIELD
EXPERIMENTAL EVIDENCE FOR COULOMB CHARGING EFFECTS IN AN OPEN QUANTUM DOT AT ZERO MAGNETIC FIELD
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零磁场下开放量子点库仑充电效应的实验证据
DOI：
10.1103/physrevlett.81.3507
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发表时间：
1998
影响因子：
8.6
通讯作者：
M. Pepper
中科院分区：
文献类型：
--
作者：
C. Liang;M. Simmons;C. Smith;G. Kim;D. Ritchie;M. Pepper
我们测量了在干净的一维通道中形成的开放量子点的低温输运特性。首次在零磁场下，当通过点$G$的电导超过$2e^2/h$时，观察到叠加在弹道电导阶上的连续和周期振荡。我们将观察到的电导振荡归因于开放点中库仑电荷效应的证据。这得到了振荡特征随温度和势垒透明度的变化而变化的支持。我们的研究结果强烈表明，在零磁场下，目前对库仑充电效应的理论和实验理解忽略了完全传输的一维通道存在下的充电。
We have measured the low-temperature transport properties of an open quantum dot formed in a clean one-dimensional channel. For the first time, at zero magnetic field, continuous and periodic oscillations superimposed upon ballistic conductance steps are observed when the conductance through the dot $G$ exceeds $2e^2/h$. We ascribe the observed conductance oscillations to evidence for Coulomb charging effects in an open dot. This is supported by the evolution of the oscillating features for $G>2e^2/h$ as a function of both temperature and barrier transparency. Our results strongly suggest that at zero magnetic field, current theoretical and experimental understanding of Coulomb charging effects overlooks charging in the presence of fully transmitted 1D channels.