Anderson critical metal phase in trivial states protected by average magnetic crystalline symmetry.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38594296.
- Also identified by DOI 10.1038/s41467-024-47467-2 and PMC identifier 11003978.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Transitions between distinct obstructed atomic insulators (OAIs) protected by crystalline symmetries, where electrons form molecular orbitals centering away from the atom positions, must go through an intermediate metallic phase. In this work, we find that the intermediate metals will become a scale-invariant critical metal phase (CMP) under certain types of quenched disorder that respect the magnetic crystalline symmetries on average. We explicitly construct models respecting average C<sub>2z</sub>T, m, and C<sub>4z</sub>T and show their scale-invariance under chemical potential disorder by the finite-size scaling method. Conventional theories, such as weak anti-localization and topological phase transition, cannot explain the underlying mechanism. A quantitative mapping between lattice and network models shows that the CMP can be understood through a semi-classical percolation problem. Ultimately, we systematically classify all the OAI transitions protected by (magnetic) groups <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi> <mi>m</mi> <mo>,</mo> <mi>P</mi> <msup><mrow><mn>2</mn></mrow> <mrow><mo>'</mo></mrow> </msup> <mo>,</mo> <mi>P</mi> <msup><mrow><mn>4</mn></mrow> <mrow><mo>'</mo></mrow> </msup> </math> , and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi> <msup><mrow><mn>6</mn></mrow> <mrow><mo>'</mo></mrow> </msup> </math> with and without spin-orbit coupling, most of which can support CMP.