Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28358027.
- Also identified by DOI 10.1038/ncomms14933 and PMC identifier 5379101.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Strong coupling between discrete phonon and continuous electron-hole pair excitations can induce a pronounced asymmetry in the phonon line shape, known as the Fano resonance. This effect has been observed in various systems. Here we reveal explicit evidence for strong coupling between an infrared-active phonon and electronic transitions near the Weyl points through the observation of a Fano resonance in the Weyl semimetal TaAs. The resulting asymmetry in the phonon line shape, conspicuous at low temperatures, diminishes continuously with increasing temperature. This behaviour originates from the suppression of electronic transitions near the Weyl points due to the decreasing occupation of electronic states below the Fermi level (E<sub>F</sub>) with increasing temperature, as well as Pauli blocking caused by thermally excited electrons above E<sub>F</sub>. Our findings not only elucidate the mechanism governing the tunable Fano resonance but also open a route for exploring exotic physical phenomena through phonon properties in Weyl semimetals.