Temperature dependence of quantum oscillations from non-parabolic dispersions
The phase offset of quantum oscillations is commonly used to experimentally diagnose topologically non-trivial Fermi surfaces. This methodology, however, is inconclusive for spin-orbit-coupled metals where \(\pi\)-phase-shifts can also arise from non-topological origins. Here, we show that the linea...
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Veröffentlicht in: | arXiv.org 2022-03 |
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Sprache: | eng |
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Zusammenfassung: | The phase offset of quantum oscillations is commonly used to experimentally diagnose topologically non-trivial Fermi surfaces. This methodology, however, is inconclusive for spin-orbit-coupled metals where \(\pi\)-phase-shifts can also arise from non-topological origins. Here, we show that the linear dispersion in topological metals leads to a \(T^2\)-temperature correction to the oscillation frequency that is absent for parabolic dispersions. We confirm this effect experimentally in the Dirac semi-metal Cd\(_3\)As\(_2\) and the multiband Dirac metal LaRhIn\(_5\). Both materials match a tuning-parameter-free theoretical prediction, emphasizing their unified origin. For topologically trivial Bi\(_2\)O\(_2\)Se, no frequency shift associated to linear bands is observed as expected. However, the \(\pi\)-phase shift in Bi\(_2\)O\(_2\)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. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1910.07608 |