期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 28, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/5/055801
关键词
quantum Hall effect; current noise; nonequilibrium; nonlinearity
资金
- Japan Society for the Promotion of Science [26220711]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [25103003]
- Yazaki Memorial Foundation for Science and Technology
- Grants-in-Aid for Scientific Research [15H05407, 15H01012, 16H00984, 15J01518, 26220711, 25103003, 15K17680] Funding Source: KAKEN
We performed noise measurements for a Corbino disk in the quantum Hall effect breakdown regime. We investigated two Corbino-disk-type devices with different sizes and observed that the Fano factor increases when the length between the contacts doubles. This observation is consistent with the avalanche picture suggested by the bootstrap electron heating model. The temperature dependence of the Fano factor indicates that the avalanche effect becomes more prominent as temperature decreases. Moreover, in the highly nonlinear regime, negative differential resistance and temporal oscillation due to bistability are found. A possible interpretation of this result is that Zener tunneling of electrons between Landau levels occurs.
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