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arXiv · 2204.11662

Domain wall nature of sketched LaAlO3/SrTiO3 nanowires

Dawei Qiu·Mengke Ha·Qing Xiao·Zhiyuan Qin·Danqing Liu·Changjian Ma·Guanglei Cheng·Jiangfeng Du
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Abstract

The rich electron correlations and highly coherent transport in reconfigurable devices sketched by a conductive atomic force microscope tip at the LaAlO3/SrTiO3 interface have enabled the oxide platform an ideal playground for studying correlated electrons and quantum technological applications. Why these one-dimensional devices possess enhanced properties over the two-dimensional interface, however, has remained elusive. Here we provide evidence that one-dimensional LaAlO3/SrTiO3 nanowires are intrinsically ferroelastic domain walls by nature through thermodynamic study. We have observed spreading resistance anomalies under thermo-stimulus and temperature cycles, with characteristic temperatures matching domain wall polarity. This information is crucial in understanding the novel phenomena including superconductivity and high mobility quantum transport.

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Dawei Qiu, Mengke Ha, Qing Xiao, Zhiyuan Qin, Danqing Liu, Changjian Ma, Guanglei Cheng, Jiangfeng Du. 2022-04-25. Domain wall nature of sketched LaAlO3/SrTiO3 nanowires. https://doi.org/10.1103/physrevb.107.155408

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