期刊
NATURE COMMUNICATIONS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms2305
关键词
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资金
- European Research Council under the European Community's Seventh Framework Program [FP7/ 2007-2013]
- ERC [227716]
- Israeli Science Foundation
- Minerva foundation
- German Israeli Foundation
- German Israeli Project Cooperation
- US-Israel Bi-National Science Foundation
- Azrieli Foundation
- European Research Council (ERC) [227716] Funding Source: European Research Council (ERC)
Upstream neutral modes, counter propagating to charge modes and carrying energy without net charge, had been predicted to exist in some of the fractional quantum Hall states and were recently observed via noise measurements. Understanding such modes will assist in identifying the wavefunction of these states, as well as shedding light on the role of Coulomb interactions within edge modes. Here, operating mainly in the v= 2/3 state, we place a quantum dot a few micrometres upstream of an ohmic contact, which serves as a 'neutral modes source'. We show that the neutral modes heat the input of the dot, causing a net thermo-electric current to flow through it. Heating of the electrons leads to a decay of the neutral mode, manifested in the vanishing of the thermo-electric current at T>110 mK. This set-up provides a straightforward method to investigate upstream neutral modes without turning to the more cumbersome noise measurements.
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