Excessive noise as a test for many-body localization

Recent experimental reports suggested the existence of a finite-temperature insulator in the vicinity of the superconductor-insulator transition. The rapid decay of conductivity over a narrow temperature range was theoretically linked to both a finite-temperature transition to a many-body-localized...

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Bibliographic Details
Published in:Physical review. B 2019-01, Vol.99 (3), p.1, Article 035135
Main Authors: Tamir, I., Levinson, T., Gorniaczyk, F., Doron, A., Lieb, J., Shahar, D.
Format: Article
Language:English
Subjects:
Insulators
Localization
Many body interactions
Noise
Noise threshold
Temperature
Threshold voltage
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Summary:Recent experimental reports suggested the existence of a finite-temperature insulator in the vicinity of the superconductor-insulator transition. The rapid decay of conductivity over a narrow temperature range was theoretically linked to both a finite-temperature transition to a many-body-localized state, and to a charge-Berezinskii-Kosterlitz-Thouless transition. Here we report of low-frequency noise measurements of such insulators to test for many-body localization. We observed a huge enhancement of the low-temperatures noise when exceeding a threshold voltage for nonlinear conductivity and discuss our results in light of the theoretical models.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.035135