Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures

Guanglei Cheng, Michelle Tomczyk, Alexandre B. Tacla, Hyungwoo Lee, Shicheng Lu, Josh P. Veazey, Mengchen Huang, Patrick Irvin, Sangwoo Ryu, Chang-Beom Eom, Andrew Daley, David Pekker, Jeremy Levy

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Article number041042
Number of pages11
JournalPhysical Review X
Volume6
Issue number4
DOIs
Publication statusPublished - 1 Dec 2016

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electron scattering
electrons
microscopes
quantum dots
solid state
conduction
oxides
simulation
interactions

Keywords

  • condensed matter physics
  • strongly correlated materials
  • superconductivity

Cite this

Cheng, G., Tomczyk, M., Tacla, A. B., Lee, H., Lu, S., Veazey, J. P., ... Levy, J. (2016). Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures. Physical Review X, 6(4), [041042]. https://doi.org/10.1103/PhysRevX.6.041042
Cheng, Guanglei ; Tomczyk, Michelle ; Tacla, Alexandre B. ; Lee, Hyungwoo ; Lu, Shicheng ; Veazey, Josh P. ; Huang, Mengchen ; Irvin, Patrick ; Ryu, Sangwoo ; Eom, Chang-Beom ; Daley, Andrew ; Pekker, David ; Levy, Jeremy. / Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures. In: Physical Review X. 2016 ; Vol. 6, No. 4.
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Cheng, G, Tomczyk, M, Tacla, AB, Lee, H, Lu, S, Veazey, JP, Huang, M, Irvin, P, Ryu, S, Eom, C-B, Daley, A, Pekker, D & Levy, J 2016, 'Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures', Physical Review X, vol. 6, no. 4, 041042. https://doi.org/10.1103/PhysRevX.6.041042

Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures. / Cheng, Guanglei; Tomczyk, Michelle; Tacla, Alexandre B.; Lee, Hyungwoo; Lu, Shicheng; Veazey, Josh P.; Huang, Mengchen; Irvin, Patrick; Ryu, Sangwoo; Eom, Chang-Beom; Daley, Andrew; Pekker, David; Levy, Jeremy.

In: Physical Review X, Vol. 6, No. 4, 041042, 01.12.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures

AU - Cheng, Guanglei

AU - Tomczyk, Michelle

AU - Tacla, Alexandre B.

AU - Lee, Hyungwoo

AU - Lu, Shicheng

AU - Veazey, Josh P.

AU - Huang, Mengchen

AU - Irvin, Patrick

AU - Ryu, Sangwoo

AU - Eom, Chang-Beom

AU - Daley, Andrew

AU - Pekker, David

AU - Levy, Jeremy

PY - 2016/12/1

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AB - 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 nanoscalereconfigurability of this system, provides an interesting starting point towards solid-state quantum simulation.

KW - condensed matter physics

KW - strongly correlated materials

KW - superconductivity

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Cheng G, Tomczyk M, Tacla AB, Lee H, Lu S, Veazey JP et al. Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures. Physical Review X. 2016 Dec 1;6(4). 041042. https://doi.org/10.1103/PhysRevX.6.041042