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Local probes for quantum Hall ferroelectrics and nematics
Name
PhysRevB.101.241103.pdf
Description
Published version
Size
736.31 KB
Format
Adobe PDF
Checksum (MD5)
d60ee9262878a3aeccc9d1f9d6fb0b9a
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.
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DOI of Published Version
10.1103/PhysRevB.101.241103
