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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/222202
Anomalous quantum transport in fractal lattices
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Fractal lattices are self-similar structures with repeated patterns on different scales. Quantum transport through such structures is subtle due to the possible co-existence of localized and extended states. Here, we study the dynamical properties of two fractal lattices, the Sierpiński gasket and the Sierpiński carpet. While the gasket exhibits sub-diffusive behavior, sub-ballistic transport occurs in the carpet. We show that the different dynamical behavior is in line with qualitative differences of the systems’ spectral properties. Specifically, in contrast to the Sierpiński carpet, the Sierpiński gasket exhibits an inverse power-law behavior of the level spacing distribution. As a possible technological application, we discuss a memory effect in the Sierpiński gasket which allows to read off the phase information of an initial state from the spatial distribution after long evolution times. We also show that interpolating between fractal and regular lattices allows for flexible tuning between different transport regimes.
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ROJO FRANCÀS, Abel, et al. Anomalous quantum transport in fractal lattices. Communications Physics. 2024. Vol. 7, num. 1. ISSN 2399-3650. [consulted: 18 of June of 2026]. Available at: https://hdl.handle.net/2445/222202