Finite Capacitive Response at the Quantum Hall Plateau

Lili Zhao, Wenlu Lin, Y. J. Chung, K. W. Baldwin, L. N. Pfeiffer, Yang Liu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We study ultra-high-mobility two-dimensional (2D) electron/hole systems with high precision capacitance measurement. It is found that the capacitance charge appears only at the fringe of the gate at high magnetic field when the 2D conductivity decreases significantly. At integer quantum Hall effects, the capacitance vanishes and forms a plateau at high temperatures T ≳ 300 mK, which surprisingly disappears at T ≲ 100 mK. This anomalous behavior is likely a manifestation that dilute particles/vacancies in the top-most Landau level form Wigner crystals, which have finite compressibility and can host polarization current.

Original languageEnglish (US)
Article number097301
JournalChinese Physics Letters
Issue number9
StatePublished - Aug 1 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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