Local probes for quantum Hall ferroelectrics and nematics
Name
PhysRevB.101.241103.pdf
Description
Published version
Size
736.31 KB
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Unknown
Checksum (MD5)
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Author(s)
Tam, Pok Man
Liu, Tongtong
Sodemann, Inti
Fu, Liang
Date Issued
2020
Journal
Physical Review B
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. Two-dimensional multivalley electronic systems in which the dispersion of individual pockets has low symmetry give rise to quantum Hall ferroelectric and nematic states in the presence of strong quantizing magnetic fields. We investigate the local signatures of these states arising near impurities that can be probed via scanning tunneling microscopy (STM) spectroscopy. For quantum Hall ferroelectrics, we demonstrate a direct relation between the dipole moment measured at impurity bound states and the ideal bulk dipole moment obtained from the modern theory of polarization. We also study the many-body problem with a single impurity via exact diagonalization and find that near strong impurities a nontrivial excitonic state can form with specific features that can be easily identified via STM spectroscopy.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.101.241103
