Robust electron pairing in the integer quantum hall effect regime
Robust electron pairing in the integer quantum hall effect regime
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DOI：
10.1038/ncomms8435
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发表时间：
2015-06-01
影响因子：
16.6
通讯作者：
Mahalu, D.
中科院分区：
文献类型：
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作者：
Choi, H. K.;Sivan, I.;Mahalu, D.
电子配对是一种罕见的现象，只出现在少数独特的物理系统中；例如，超导体和近藤相关量子点。在这里，我们报告了整数量子霍尔效应中一个意想不到的电子配对。这种配对发生在电子法布里-珀罗干涉仪的干涉边缘通道内，体积填充系数范围在2到5之间。我们报告了三个主要的观测结果：高可见度的阿哈罗诺夫-玻姆电导振荡，其磁通量周期等于磁通量量子的一半；干涉准粒子电荷等于量子散粒噪声测量中显示的基本电子电荷的两倍，并且通过诱导相邻内缘通道的脱相而使对的干涉完全脱相，这是通道间纠缠的表现。虽然这种配对现象显然是由通道间相互作用引起的，但导致单边通道内电子-电子吸引的确切机制尚不清楚。我们认为，需要作出重大努力，以澄清这些令人感兴趣和意想不到的发现。
Electron pairing is a rare phenomenon appearing only in a few unique physical systems; for example, superconductors and Kondo-correlated quantum dots. Here, we report on an unexpected electron pairing in the integer quantum Hall effect regime. The pairing takes place within an interfering edge channel in an electronic Fabry-Perot interferometer at a wide range of bulk filling factors, between 2 and 5. We report on three main observations: high-visibility Aharonov-Bohm conductance oscillations with magnetic flux periodicity equal to half the magnetic flux quantum; an interfering quasiparticle charge equal to twice the elementary electron charge as revealed by quantum shot noise measurements, and full dephasing of the pairs' interference by induced dephasing of the adjacent inner edge channel-a manifestation of inter-channel entanglement. Although this pairing phenomenon clearly results from inter-channel interaction, the exact mechanism that leads to electron-electron attraction within a single edge channel is not clear. We believe that substantial efforts are needed in order to clarify these intriguing and unexpected findings.