Long-Range Nanoelectromechanical Coupling at the LaAlO_3/SrTiO_3 Interface
arxiv(2024)
摘要
The LaAlO_3/SrTiO_3 interface hosts a plethora of gate-tunable electronic
phases. Gating of LaAlO_3/SrTiO_3 interfaces are usually assumed to occur
electrostatically. However, increasing evidence suggests that non-local
interactions can influence and, in some cases, dominate the coupling between
applied gate voltages and electronic properties. Here, we sketch quasi-1D
ballistic electron waveguides at the LaAlO_3/SrTiO_3 interface as a probe
to understand how gate tunability varies as a function of spatial separation.
Gate tunability measurements reveal the scaling law to be at odds with the pure
electrostatic coupling observed in traditional semiconductor systems. The
non-Coulombic gating at the interface is attributed to the existence of a
long-range nanoelectromechanical coupling between the gate and electron
waveguide, mediated by the ferroelastic domains in SrTiO_3. The long-range
interactions at the LaAlO_3/SrTiO_3 interface add unexpected richness and
complexity to this correlated electron system.
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