L64.00005. Nanoscale control of the metal-insulator transition in free-standing LaAlO3/SrTiO3 membranes*

Presented by: Muqing Yu


By combining 2D materials such as graphene into layered van der Waals heterostructures, new types of designer materials with unique and emergent properties have been realized [1]. We describe a method for achieving free-standing single-crystal LaAlO3/SrTiO3 membranes by etching away a sacrificial SrRuO3 layer underneath SrTiO3. LaAlO3/SrTiO3 membranes are transferred to a sapphire substrate, and we use conductive AFM lithography [2] to achieve nanoscale control the insulator to metal transition at the LaAlO3/SrTiO3 interface. Nanoscale conductive channels created at room temperature remain conductive at two Kelvin. These results demonstrate the capacity to create LaAlO3/SrTiO3 membranes that can be integrated with other materials and reversibly patterned at nanoscale dimensions.


  • Muqing Yu
  • Kitae Eom
  • Dengyu Yang
  • Jung-Woo Lee
  • Chang-Beom Eom
  • Patrick Irvin
  • Jeremy Levy


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