Topology- and symmetry-protected domain wall conduction in quantum Hall nematics
- McGill Univ., Montreal, QC (Canada); Princeton Univ., NJ (United States)
- Princeton Univ., NJ (United States)
- Univ. of Oxford (United Kingdom)
We consider domain walls in nematic quantum Hall ferromagnets predicted to form in multivalley semiconductors, recently probed by scanning tunneling microscopy experiments on Bi(111) surfaces. We show that the domain wall properties depend sensitively on the filling factor ν of the underlying (integer) quantum Hall states. For ν = 1 and in the absence of impurity scattering we argue that the wall hosts a single-channel Luttinger liquid whose gaplessness is a consequence of valley and charge conservation. For ν = 2, it supports a two-channel Luttinger liquid, which for sufficiently strong interactions enters a symmetry-preserving thermal metal phase with a charge gap coexisting with gapless neutral intervalley modes. In this work, the domain wall physics in this state is identical to that of a bosonic topological insulator protected byU(1) ×U(1) symmetry, and we provide a formal mapping between these problems. We discuss other unusual properties and experimental signatures of these anomalous one-dimensional systems.
- Research Organization:
- Princeton Univ., NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); UK Foundation; National Science Foundation (NSF); European Research Council (ERC); European Union Horizon 2020 Research and Innovation Programme; Gordon and Betty Moore Foundation
- Grant/Contract Number:
- FG02-07ER46419; SC0002140; 804213-TMCS
- OSTI ID:
- 1800474
- Alternate ID(s):
- OSTI ID: 1567921
- Journal Information:
- Physical Review. B, Vol. 100, Issue 16; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Charge and spin textures of Ising quantum Hall ferromagnet domain walls
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journal | December 2019 |
Interacting multi-channel topological boundary modes in a quantum Hall valley system
|
journal | February 2019 |
Charge and spin textures of Ising quantum Hall ferromagnet domain walls | text | January 2019 |
Interacting multi-channel topological boundary modes in a quantum Hall valley system | text | January 2019 |
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