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arXiv · 2404.16927

Superdiffusive transport on lattices with nodal impurities

Yu-Peng Wang·Jie Ren·Chen Fang
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Abstract

We show that 1D lattice models exhibit superdiffusive transport in the presence of random "nodal impurities" in the absence of interaction. Here a nodal impurity is defined as a localized state, the wave function of which has zeros (nodes) in momentum space. The dynamics exponent $z$, a defining quantity for transport behaviors, is computed to establish this result. To be specific, in a disordered system having only nodal impurities, the dynamical exponent $z=4n/(4n-1)$ where $n$ is the order of the node. If the system has time reversal, the nodes appear in pairs and the dynamical exponent can be enhanced to $z=8n/(8n-1)$. As $1<z<2$, both cases indicate superdiffusive transport.

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Yu-Peng Wang, Jie Ren, Chen Fang. 2024-04-25. Superdiffusive transport on lattices with nodal impurities. https://doi.org/10.1103/physrevb.110.144201

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