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Electron pairing and nematicity in LaAlO3/SrTiO3 nanostructures

Author

Listed:
  • Aditi Nethwewala

    (University of Pittsburgh
    Pittsburgh Quantum Institute)

  • Hyungwoo Lee

    (University of Wisconsin-Madison)

  • Jianan Li

    (University of Pittsburgh
    Pittsburgh Quantum Institute)

  • Megan Briggeman

    (University of Pittsburgh
    Pittsburgh Quantum Institute)

  • Yun-Yi Pai

    (University of Pittsburgh
    Pittsburgh Quantum Institute)

  • Kitae Eom

    (University of Wisconsin-Madison)

  • Chang-Beom Eom

    (University of Wisconsin-Madison)

  • Patrick Irvin

    (University of Pittsburgh
    Pittsburgh Quantum Institute)

  • Jeremy Levy

    (University of Pittsburgh
    Pittsburgh Quantum Institute
    University of Pittsburgh)

Abstract

Strongly correlated electronic systems exhibit a wealth of unconventional behavior stemming from strong electron-electron interactions. The LaAlO3/SrTiO3 (LAO/STO) heterostructure supports rich and varied low-temperature transport characteristics including low-density superconductivity, and electron pairing without superconductivity for which the microscopic origins is still not understood. LAO/STO also exhibits inexplicable signatures of electronic nematicity via nonlinear and anomalous Hall effects. Nanoscale control over the conductivity of the LAO/STO interface enables mesoscopic experiments that can probe these effects and address their microscopic origins. Here we report a direct correlation between electron pairing without superconductivity, anomalous Hall effect and electronic nematicity in quasi-1D ballistic nanoscale LAO/STO Hall crosses. The characteristic magnetic field at which the Hall coefficient changes directly coincides with the depairing of non-superconducting pairs showing a strong correlation between the two distinct phenomena. Angle-dependent Hall measurements further reveal an onset of electronic nematicity that again coincides with the electron pairing transition, unveiling a rotational symmetry breaking due to the transition from paired to unpaired phases at the interface. The results presented here highlights the influence of preformed electron pairs on the transport properties of LAO/STO and provide evidence of the elusive pairing “glue” that gives rise to electron pairing in SrTiO3-based systems.

Suggested Citation

  • Aditi Nethwewala & Hyungwoo Lee & Jianan Li & Megan Briggeman & Yun-Yi Pai & Kitae Eom & Chang-Beom Eom & Patrick Irvin & Jeremy Levy, 2023. "Electron pairing and nematicity in LaAlO3/SrTiO3 nanostructures," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43539-x
    DOI: 10.1038/s41467-023-43539-x
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    References listed on IDEAS

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    1. Arjun Joshua & S. Pecker & J. Ruhman & E. Altman & S. Ilani, 2012. "A universal critical density underlying the physics of electrons at the LaAlO3/SrTiO3 interface," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    2. B. Keimer & S. A. Kivelson & M. R. Norman & S. Uchida & J. Zaanen, 2015. "From quantum matter to high-temperature superconductivity in copper oxides," Nature, Nature, vol. 518(7538), pages 179-186, February.
    3. Guanglei Cheng & Michelle Tomczyk & Shicheng Lu & Joshua P. Veazey & Mengchen Huang & Patrick Irvin & Sangwoo Ryu & Hyungwoo Lee & Chang-Beom Eom & C. Stephen Hellberg & Jeremy Levy, 2015. "Electron pairing without superconductivity," Nature, Nature, vol. 521(7551), pages 196-199, May.
    4. C. Richter & H. Boschker & W. Dietsche & E. Fillis-Tsirakis & R. Jany & F. Loder & L. F. Kourkoutis & D. A. Muller & J. R. Kirtley & C. W. Schneider & J. Mannhart, 2013. "Interface superconductor with gap behaviour like a high-temperature superconductor," Nature, Nature, vol. 502(7472), pages 528-531, October.
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