Multifractal Conductance Fluctuations in High-Mobility Graphene in the Integer Quantum Hall Regime.
Phys Rev Lett
; 129(18): 186802, 2022 Oct 28.
Article
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| MEDLINE
| ID: mdl-36374690
ABSTRACT
We present the first experimental evidence for the multifractality of a transport property at a topological phase transition. In particular, we show that conductance fluctuations display multifractality at the integer quantum Hall plateau-to-plateau transitions in high-mobility mesoscopic graphene devices. The multifractality gets rapidly suppressed as the chemical potential moves away from these critical points. Our combination of experimental study and multifractal analysis provides a novel method for probing the criticality of wave functions at phase transitions in mesoscopic systems, and quantum criticality in several condensed-matter systems.
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Phys Rev Lett
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2022
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Article