Quantum Hall Mach-Zehnder interferometer at fractional filling factors

Quantum Hall Mach-Zehnder interferometer at fractional filling factors
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DOI:
10.1209/0295-5075/100/67009
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发表时间:
2012-12-01
期刊:
EPL
影响因子:
1.8
通讯作者:
Sorba, L.
Sorba, L.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Deviatov, E. V.;Egorov, S. V.;Sorba, L.

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我们使用一种新型设计的马赫 - 曾德尔量子霍尔干涉仪来研究在分数量子霍尔填充因子下的干涉效应。我们的器件集合了常规马赫 - 曾德尔和法布里 - 珀罗量子霍尔干涉仪的优点。它实现了分析起来最简单的马赫 - 曾德尔干涉方案,且不受库仑阻塞效应的影响。与标准的马赫 - 曾德尔实现方式不同,我们的器件在干涉环内部不包含蚀刻区域。对于马赫 - 曾德尔干涉方案来说,该器件首次在填充因子为1/3时展示出具有$\Phi^{*} = e/e^{*}\Phi(0)=\Phi(0)/\nu$周期性的干涉振荡。这一结果表明,我们从简单的阿哈罗诺夫 - 玻姆干涉中观察到了分数量子化准粒子的明确证据。版权所有 (c) EPLA,2012
We use a Mach-Zehnder quantum Hall interferometer of a novel design to investigate the interference effects at fractional filling factors. Our device brings together the advantages of usual Mach-Zehnder and Fabry-Perot quantum Hall interferometers. It realizes the simplest-for-analysis Mach-Zehnder interference scheme, free from Coulomb blockade effects. By contrast to the standard Mach- Zehnder realization, our device does not contain an etched region inside the interference loop. For the first time for a Mach- Zehnder interference scheme, the device demonstrates interference oscillations with Phi* = e/e* Phi(0) = Phi(0)/nu periodicity at fractional filling factor 1/3. This result indicates that we observe a clear evidence for fractionally charged quasiparticles from simple Aharonov-Bohm interference. Copyright (c) EPLA, 2012