Long-range Nonlinear Sigma Model for a Singular Quantum Kicked Rotor

Abstract:Singular kicked rotors have long been compared with power-law random banded matrices (PRBM) because their momentum-space Floquet matrix elements decay algebraically. However, it has remained unclear whether the deterministic correlations of the rotor become irrelevant at long distances and, consequently, under what conditions the two systems share the same infrared theory. To address this question, we derive a nonlocal supersymmetric nonlinear sigma model directly from a quantum kicked rotor with a power-law or logarithmic singularity. By carrying out the renormalization-group analysis up to two-loop order, we show that, after matching the symmetry class and coupling convention, the rotor reproduces the long-range Anderson transition of the corresponding PRBM, including its localized, critical, and extended infrared regimes.

Disordered Systems and Neural Networks (cond-mat.dis-nn); Statistical Mechanics (cond-mat.stat-mech); Quantum Physics (quant-ph)

arXiv:2608.17649 [cond-mat.dis-nn]

(or arXiv:2608.17649v1 [cond-mat.dis-nn] for this version)

https://doi.org/10.48550/arXiv.2608.17649 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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