Quantum

Study of localization properties under subsystem periodic driving

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 27/10/2026, 04:13:24 UTC.

Briefings

A two-leg quantum ladder with an Aubry-André chain coupled to a periodically driven clean chain was studied. Exact numerical calculations revealed that driving only a subsystem below a critical frequency cannot achieve complete delocalization. Instead, a mixed phase emerged where localized and delocalized states coexist, with the fraction of delocalized states varying nonmonotonically with the driving frequency. This behavior was understood using local effective Hamiltonians, which predict the localization transition in the moderate-frequency regime up to a crossover frequency lower than the critical frequency. The study demonstrates an alternative route to Floquet engineering by modifying transport properties via subsystem driving.

Key points

• A two-leg quantum ladder with an Aubry-André chain coupled to a periodically driven clean chain was studied.
• Exact numerical calculations showed that subsystem driving below a critical frequency cannot achieve complete delocalization.

Context

This research investigates whether delocalization can be achieved by driving only a part of a quantum system, specifically using a two-leg ladder model. The findings provide an alternative route to Floquet engineering, modifying transport properties without full system control.

Limitations

Results are based on exact numerical calculations for a specific two-leg ladder model. The crossover frequency for effective Hamiltonians is lower than the critical frequency for localization. The study does not cover higher-dimensional systems or alternative driving protocols.

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