Quantum Hall plateau-plateau transition revisited
Journal
Chinese Journal of Physics
Journal Volume
82
Date Issued
2023-04-01
Author(s)
Yeh, Ching Chen
Wang, Siang Chi
Lo, Shun Tsung
Kim, Gil Ho
Ritchie, D. A.
Strasser, Gottfried
Abstract
We observe a temperature-independent point Bc in the longitudinal resistance Rxx of a GaAs-based two-dimensional electron gas in the quantum Hall plateau-plateau transition. This allows us to revisit the spin-degenerate plateau-plateau transition and use the Rxx peak movement with respect to Bc at various temperatures T so as to calculate the critical exponent κ. We suggest that one measures the maximum of the derivative of Hall resistivity dρxy/dB ∼ T−κ as well as the movement of Rxx at different temperatures, allowing one to measure κs using two independent methods. When the peak movement is so large that the resistance peak is no longer in the vicinity of Bc, a largely deviated κ =0.54±0.04 from the value (0.21±0.02 ) in some spin-degenerate system can be measured.
Subjects
Critical exponent | Quantum Hall plateau | Transition | Two-dimensional critical magnetic field
Type
journal article