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Single-Mode Superconductivity in LaAlO3/SrTiO3 Nanostructures

  • Joshua P. Veazey (a1), Guanglei Cheng (a1), Patrick Irvin (a1), Shicheng Lu (a1), Mengchen Huang (a1), Feng Bi (a1), Chung-Wung Bark (a2), Sangwoo Ryu (a2), Kwang-Hwan Cho (a2), Chang-Beom Eom (a2) and Jeremy Levy (a1)...

Abstract

The properties of superconductors at the extreme limits of dimensionality are of fundamental interest. The interface of LaAlO3 and SrTiO3 hosts a quasi-two-dimensional superconductor below Tc≈200 mK. Here we report superconductivity in nanowire-shaped structures created at the LaAlO3/SrTiO3 interface using conductive atomic force microscope lithography. Nanowire cross-sections are small compared to the superconducting coherence length in LaAlO3/SrTiO3 (w <<ξSC∼100 nm), placing them in the quasi-1D regime. The ability to “write” fully superconducting nanostructures on an insulating LaAlO3/SrTiO3 “canvas” opens possibilities for the development of new families of superconducting nanoelectronics. Four-terminal transport measurements suggest that in some devices both the normal and superconducting states are confined to a single quantum channel.

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Keywords

Single-Mode Superconductivity in LaAlO3/SrTiO3 Nanostructures

  • Joshua P. Veazey (a1), Guanglei Cheng (a1), Patrick Irvin (a1), Shicheng Lu (a1), Mengchen Huang (a1), Feng Bi (a1), Chung-Wung Bark (a2), Sangwoo Ryu (a2), Kwang-Hwan Cho (a2), Chang-Beom Eom (a2) and Jeremy Levy (a1)...

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