Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures

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Cheng, Guanglei and Tomczyk, Michelle and Tacla, Alexandre B. and Lee, Hyungwoo and Lu, Shicheng and Veazey, Josh P. and Huang, Mengchen and Irvin, Patrick and Ryu, Sangwoo and Eom, Chang-Beom and Daley, Andrew and Pekker, David and Levy, Jeremy (2016) Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures. Physical Review X, 6 (4). 041042. ISSN 2160-3308 (https://doi.org/10.1103/PhysRevX.6.041042)

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Abstract

The interface between the two complex oxides LaAlO3 and SrTiO3 has remarkable properties that can be locally reconfigured between conducting and insulating states using a conductive atomic force microscope. Prior investigations of "sketched" quantum dot devices revealed a phase in which electrons form pairs, implying a strongly attractive electron-electron interaction. Here, we show that these devices with strong electron-electron interactions can exhibit a gate-tunable transition from a pair-tunneling regime to a single-electron (Andreev bound state) tunneling regime where the interactions become repulsive. The electron-electron interaction sign change is associated with a Lifshitz transition where the dxz and dyz bands start to become occupied. This electronically tunable electron-electron interaction, combined with the nanoscale reconfigurability of this system, provides an interesting starting point towards solid-state quantum simulation.

ORCID iDs

Cheng, Guanglei, Tomczyk, Michelle, Tacla, Alexandre B. ORCID logoORCID: https://orcid.org/0000-0003-0738-8151, Lee, Hyungwoo, Lu, Shicheng, Veazey, Josh P., Huang, Mengchen, Irvin, Patrick, Ryu, Sangwoo, Eom, Chang-Beom, Daley, Andrew ORCID logoORCID: https://orcid.org/0000-0001-9005-7761, Pekker, David and Levy, Jeremy;
  • Item type:Article
    ID code:59064
    Dates:
    Date
    Event
    1 December 2016
    Published
    7 October 2016
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:12 Dec 2016 10:31
    Last modified:11 Nov 2024 11:34
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/59064
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