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Researchers demonstrate that pure dephasing can actively engineer new mobility edges in quasicrystals, fundamentally altering the boundaries between localized and extended electron states rather than merely destroying quantum coherence. This discovery reveals a mechanism to control energy dissipation and manipulate electron flow through environmental interactions, challenging the traditional view that disorder inevitably eliminates quantum localization. The findings offer a novel pathway for designing materials with tailored transport properties by leveraging previously considered detrimental decoherence effects.

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Researchers Find Dephasing Induces New Mobility Edges

Quantum ZeitgeistSeptember 11, 20264 min read

Pure dephasing, typically considered destructive to quantum interference, can now actively reshape boundaries between localised and extended states in specific materials. Unlike previous understandings which viewed dissipation as detrimental, this work demonstrates its ability to *induce* distinct mobility edges not seen in coherent systems. Numerical verification reveals anomalous localisation behaviour even when initial electron wavefunctions are already delocalised or multifractal.

Pure dephasing, the loss of a particle's wave information without losing energy, actively controls where electrons move in off-diagonal Aubry, André, Harper quasicrystals according to Ming-Jie Tao of Chengdu University of Technology and colleagues from Hangzhou Normal University and Nankai University. Introducing pure dephasing into certain materials does not always destroy quantum localisation but instead actively reshapes it, creating new boundaries between different states of matter previously thought only weakened…

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