Electrically Controlled Quantum Transition to an Anomalous Metal in 2D AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c00624

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The mechanism through which superconductivity is destroyed upon controlled disordering often holds the key to understanding the mechanism of the emergence of superconductivity. Here, we demonstrate an in-situ mechanism to control the fraction of disorder in a 2D superconductor. By controlling an electric field VG, we created an assembly of segregated superconducting nano-islands and varied the interisland distance to accomplish a quantum phase transition from a superconducting phase to a strange quantum anomalous metallic (QAM) phase at LaVO3/SrTiO3 interfaces. In the QAM phase, the resistivity dropped below a critical temperature (TCM) as if the system was approaching superconductivity and then saturated, indicating the destruction of global phase coherence and the emergence of a phase where metal-like transport of Bosons (a Bose metal) becomes a possibility. The unprecedented control over the island size is obtained through the control of nanometer-scale ferroelectric domains formed in the SrTiO3 side of the interface due to a low-temperature structural phase transition.