Superdiffusive transport on lattices with nodal impurities

• URL: http://arxiv.org/abs/2404.16927v2
• Date: Fri, 27 Sep 2024 10:28:24 GMT
• Title: Superdiffusive transport on lattices with nodal impurities
• Authors: Yu-Peng Wang, Jie Ren, Chen Fang,
• Abstract summary: We show that 1D lattice models exhibit superdiffusive transport in the presence of random "nodal impurities" A nodal impurity is defined as a localized state, the wave function of which has zeros in momentum space.
• Score: 7.470473448588115
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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