Driven quantum materials with on demand properties controlled by external
stimuli are critical for emergent quantum technology. In optically tunable
superconducting heterostructures, the lattice responses at the buried interface
may hold the key to the light susceptibility but is very challenging to detect.
In this work, a nondestructive synchrotron-based X-ray scattering
phase-retrieval technique is implemented in monolayer-FeSe/SrTiO3
heterostructures to capture the three-dimensional interfacial atomic
displacements in-situ as the interface superconductivity is actively
manipulated by light. It is found that the interlayer sliding between FeSe and
SrTiO3 can drastically alter how the lattice responds to the light. In domains
with selected stacking configurations, the interface transforms the very weak
photoexcitation in SrTiO3 into significant Fe-atom displacements in FeSe and
generate metastable interfacial structures that can lead to a persistent
superconductivity enhancement. These findings demonstrate an effective strategy
for achieving greatly amplified light-lattice coupling for efficient quantum
phase manipulations at designed interfaces.

Este artículo explora los viajes en el tiempo y sus implicaciones.

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