Statistics of Conductances and Subleading Corrections to Scaling near the Integer Quantum Hall Plateau Transition

Abstract

We study the critical behavior near the integer quantum Hall plateau transition by focusing on the multifractal (MF) exponents $X_q$ describing the scaling of the disorder-average moments of the point contact conductance $T$ between two points of the sample, within the Chalker-Coddington network model. Past analytical work has related the exponents $X_q$ to the MF exponents ${\Delta }_q$ of the local density of states (LDOS). To verify this relation, we numerically determine the exponents $X_q$ with high accuracy. We thereby provide, at the same time, independent numerical results for the MF exponents ${\Delta }_q$ for the LDOS. The presence of subleading corrections to scaling makes such determination directly from scaling of the moments of $T$ virtually impossible. We overcome this difficulty by using two recent advances. First, we construct pure scaling operators for the moments of $T$ which have precisely the same leading scaling behavior, but no subleading contributions. Secondly, we take into account corrections to scaling from irrelevant (in the renormalization group sense) scaling fields by employing a numerical technique ("stability map") recently developed by us. We thereby numerically confirm the relation between the two sets of exponents, $X_q$ (point contact conductances) and ${\Delta }_q$ (LDOS), and also determine the leading irrelevant (corrections to scaling) exponent $y$ as well as other subleading exponents. Our results suggest a way to access multifractality in an experimental setting.

7 pages and 4 figures, plus Supplemental material

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Cited by in corpus (6)

• Quantum Critical Exponents for a Disordered Three-Dimensional Weyl Node
• Spin-directed network model for the surface states of weak three-dimensional ${\mathbb{Z}}_2^{}$ topological insulators
• Pure scaling operators at the integer quantum Hall plateau transition
• Quartic multifractality and finite-size corrections at the spin quantum Hall transition
• Quantum Hall criticality in an amorphous Chern insulator
• Supersymmetry approach to delocalization transitions in a network model of the weak field quantum Hall effect and related models