Work

Superdiffusive Transport in Chaotic Quantum Systems with Nodal Interactions

Year: 2025

Type: article

Abstract: We introduce a class of interacting fermionic quantum models in d dimensions with nodal interactions that exhibit superdiffusive transport. We establish nonperturbatively that the nodal structure of the interactions gives rise to long-lived quasiparticle excitations that result in a diverging diffusion constant, even though the system is fully chaotic. Using a Boltzmann equation approach, we find that the charge mode acquires an anomalous dispersion relation at long wavelength ω(q)∼q^{z} with dynamical exponent z=min[(2n+d)/2n,2], where n is the order of the nodal point in momentum space. We verify our predictions in one-dimensional systems using tensor-network techniques.

Source: Physical Review Letters

DOI: 10.1103/xx9z-4j6c

Authors: Yu-Peng Wang, Jie Ren, Sarang Gopalakrishnan, Romain Vasseur