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This research demonstrates a reversal of standard transport hierarchies in non-Hermitian quasicrystals, where criticality enhances conductivity to a ballistic regime rather than causing localization. By utilizing dynamical quantum phase transitions and the Aubry-André-Harper model, the study quantifies this shift with a diffusion exponent of β=1, offering new pathways for controlling energy propagation in structured materials.

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Zhejiang Normal Team Finds Faster Transport in Critical Quasicrystals

Quantum Zeitgeist10 septembrie 20264 min de cititArticolul și perspectiva sunt în engleză.

Extended phases now exhibit diffusive behaviour while their critical counterparts become ballistic, reversing established expectations for energy movement within these materials. This anomalous transport arises from a one-dimensional Aubry, André, Harper model incorporating ‘nonreciprocity’, where criticality, typically associated with localisation, instead enhances conductivity. Wavepacket diffusion analysis reveals this shift is quantified by a transition to β=1 at the critical point, signalling faster propagation than previously understood.

The critical phase of a non-Hermitian quasicrystal exhibits stronger transport than its surrounding delocalized phases. A one-dimensional nonreciprocal Aubry, André, Harper model using dynamical quantum phase transitions and wavepacket diffusion analysis reveals this behaviour at Zhejiang Normal University. Nonreciprocity reverses expected hierarchies in how materials conduct, potentially enabling new approaches to control quantum systems. A specific state within structured materials can unexpectedly enhance movement instead of restrict it. Studying non-Hermitian quasicrystals, materials exhibiting unique wave behaviour,…

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