期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.226801
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资金
- European Research Council under the European Community [227716]
- Israeli Science Foundation (ISF)
- Minerva foundation
- German Israeli Foundation (GIF)
- German Israeli Project Cooperation (DIP)
- US-Israel Bi-National Science Foundation (BSF)
- European Research Council (ERC) [227716] Funding Source: European Research Council (ERC)
Counterpropagating (upstream) chiral neutral edge modes, which were predicted to be present in hole-conjugate states, were observed recently in a variety of fractional quantum Hall states (nu = 2/3, nu = 3/5, nu = 8/3, and nu = 5/2), by measuring the charge noise that resulted after partitioning the neutral mode by a constriction (denoted, as N -> C). Particularly noticeable was the observation of such modes in the nu = 5/2 fractional state-as it sheds light on the non-Abelian nature of the state's wave function. Yet, the nature of these unique, upstream, chargeless modes and the microscopic process in which they generate shot noise, are not understood. Here, we study the ubiquitous nu = 2/3 state and report of two main observations: First, the nature of the neutral modes was tested by colliding two modes, emanating from two opposing sources, in a narrow constriction. The resultant charge noise was consistent with local heating of the partitioned quasiparticles. Second, partitioning of a downstream charge mode by a constriction gave birth to a dual process, namely, the appearance of an upstream neutral mode (C -> N). In other words, splitting hole conjugated type quasiparticles will lead to an energy loss and decoherence, with energy carried away by neutral modes.
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