Frictional drag experiments in LAO/KTO nanowires

LaAlO3/KTaO3 heterostructures host a gate tunable 2D electron system at its interface that exhibits superconductivity dependent on its crystal orientation of its interface with Tc ~ 2K along [111]. The nature of the superconducting pairing and dependence on orientation dependence is still not well understood. We aim to address these open questions through frictional drag measurements between nanowires in electronic-grade [4] LaAlO3/KTaO3 created using conductive atomic force microscopy (c-AFM) lithography [3]. When two electrical conductors are placed in proximity, driving a current through one conductor can induce a (frictional drag) voltage in the other. In other materials, different interactions have been reported to lead to drag resistance such as coulomb drag, phonon drag, spin drag, vortex drag and excitonic effects. Understanding the dependence of drag resistance on various parameters like temperature, interwire spacing, and magnetic field can provide valuable insights into electron-electron interactions in LaAlO3/KTaO3.

[1] Liu, Changjiang, et al. 2021. Science <a href="tel:371.6530">371.6530 (2021): 716-721.

[2] Chen, Zheng, et al. 2021. Science 372 (6543): 721–24.

[3] Yu, Muqing, et al. Nano Lett. 22.15 (2022): <a href="tel:6062–6068">6062–6068.

[4] Kim, Jieun, et al. 2024. Science Advances 10 (21): eadk4288.