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

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. As a result, 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.

Authors:
ORCiD logo [1];  [2];  [3];  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. National Institute of Standards and Technology, Gaithersburg, MD (United States); Cornell Univ., Ithaca, NY (United States)
  4. National High Magnetic Field Lab., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Materials Sciences and Engineering Division
OSTI Identifier:
1333158
Alternate Identifier(s):
OSTI ID: 1352906
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; phase transitions and critical phenomena

Citation Formats

Bhattacharya, Anand, Skinner, Brian, Khalsa, Guru, and Suslov, Alexey V. Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate. United States: N. p., 2016. Web. doi:10.1038/ncomms12974.
Bhattacharya, Anand, Skinner, Brian, Khalsa, Guru, & Suslov, Alexey V. Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate. United States. doi:10.1038/ncomms12974.
Bhattacharya, Anand, Skinner, Brian, Khalsa, Guru, and Suslov, Alexey V. Thu . "Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate". United States. doi:10.1038/ncomms12974. https://www.osti.gov/servlets/purl/1333158.
@article{osti_1333158,
title = {Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate},
author = {Bhattacharya, Anand and Skinner, Brian and Khalsa, Guru and Suslov, Alexey V.},
abstractNote = {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. As a result, 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.},
doi = {10.1038/ncomms12974},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {9}
}

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