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Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate

Author

Listed:
  • Anand Bhattacharya

    (Argonne National Laboratory)

  • Brian Skinner

    (Argonne National Laboratory
    Massachusetts Institute of Technology)

  • Guru Khalsa

    (Center for Nanoscale Science and Technology, National Institute of Standards and Technology
    Present address: Department of Materials Science and Engineering, Cornell University, 126 Bard Hall, Ithaca, NY 14853-1501)

  • Alexey V. Suslov

    (National High Magnetic Field Laboratory)

Abstract

When an electronic system is subjected to a sufficiently strong magnetic field that the cyclotron energy is much larger than the Fermi energy, the system enters the extreme quantum limit (EQL) and becomes susceptible to a number of instabilities. Bringing a three-dimensional electronic system deeply into the EQL can be difficult however, since it requires a small Fermi energy, large magnetic field, and low disorder. Here we present an experimental study of the EQL in lightly-doped single crystals of strontium titanate. Our experiments probe deeply into the regime where theory has long predicted an interaction-driven charge density wave or Wigner crystal state. A number of interesting features arise in the transport in this regime, including a striking re-entrant nonlinearity in the current–voltage characteristics. We discuss these features in the context of possible correlated electron states, and present an alternative picture based on magnetic-field induced puddling of electrons.

Suggested Citation

  • Anand Bhattacharya & Brian Skinner & Guru Khalsa & Alexey V. Suslov, 2016. "Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12974
    DOI: 10.1038/ncomms12974
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