arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.10065cond-mat.mes-hall
收藏

量子霍尔边缘通道中的俄歇光谱:能量丢失问题的一种可能解决方案

Auger-spectroscopy in quantum Hall edge channels: a possible resolution to the missing energy problem

T. Krähenmann, S. G. Fischer, M. Röösli, T. Ihn, C. Reichl, W. Wegscheider, K. Ensslin, Y. Gefen, Y. Meir

摘要:

量子霍尔边缘通道为研究一维量子输运提供了一个高效、可控的平台。这种通道是在纳米尺度上有效传输量子信息的一种有前景的工具,在揭示有趣的物理学方面起着至关重要的作用。沿着边缘的电流携带能量和热量,导致非弹性散射,这可能阻碍相干传输。几个实验试图探测伴随的能量沿边缘重新分布报告能量损失通过未知的非弹性散射机制。在这里,我们采用量子点注入和提取特定能量的电子,光谱分析量子霍尔边缘通道内的非弹性散射。我们发现,“失踪的能量”的难题可以解开,将非本地的俄歇样的过程,在该过程中,能量在空间上分开的部分之间的样本重新分配。我们的理论分析,占实验结果,挑战常识分析,忽略了这样的非本地衰减通道。

英文摘要:

Quantum Hall edge channels offer an efficient and controllable platform to study quantum transport in one dimension. Such channels are a prospective tool for the efficient transfer of quantum information at the nanoscale, and play a vital role in exposing intriguing physics. Electric current along the edge carries energy and heat leading to inelastic scattering, which may impede coherent transport. Several experiments attempting to probe the concomitant energy redistribution along the edge reported energy loss via unknown mechanisms of inelastic scattering. Here we employ quantum dots to inject and extract electrons at specific energies, to spectrally analyse inelastic scattering inside quantum Hall edge channels. We show that the "missing energy" puzzle can be untangled by incorporating non-local Auger-like processes, in which energy is redistributed between spatially separate parts of the sample. Our theoretical analysis, accounting for the experimental results, challenges common-wisdom analyses which ignore such non-local decay channels.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑