Temperature dependence of quantum oscillations from non-parabolic dispersions.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34711834.
- Also identified by DOI 10.1038/s41467-021-26450-1 and PMC identifier 8553939.
- 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
The phase offset of quantum oscillations is commonly used to experimentally diagnose topologically nontrivial Fermi surfaces. This methodology, however, is inconclusive for spin-orbit-coupled metals where π-phase-shifts can also arise from non-topological origins. Here, we show that the linear dispersion in topological metals leads to a T<sup>2</sup>-temperature correction to the oscillation frequency that is absent for parabolic dispersions. We confirm this effect experimentally in the Dirac semi-metal Cd<sub>3</sub>As<sub>2</sub> and the multiband Dirac metal LaRhIn<sub>5</sub>. Both materials match a tuning-parameter-free theoretical prediction, emphasizing their unified origin. For topologically trivial Bi<sub>2</sub>O<sub>2</sub>Se, no frequency shift associated to linear bands is observed as expected. However, the π-phase shift in Bi<sub>2</sub>O<sub>2</sub>Se would lead to a false positive in a Landau-fan plot analysis. Our frequency-focused methodology does not require any input from ab-initio calculations, and hence is promising for identifying correlated topological materials.