Details

Autor(en) / Beteiligte

• Xu, B.
• Dai, Y. M.
• Zhao, L. X.
• Wang, K.
• Yang, R.
• Zhang, W.
• Liu, J. Y.
• Xiao, H.
• Chen, G. F.
• Trugman, S. A.
• Zhu, J-X
• Taylor, A. J.
• Yarotski, D. A.
• Prasankumar, R. P.
• Qiu, X. G.

Titel

Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs

Ist Teil von

• Nature communications, 2017-03, Vol.8 (1), p.14933-14933, Article 14933

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 F ) with increasing temperature, as well as Pauli blocking caused by thermally excited electrons above E F . 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. The study of lattice vibrations coupled to electronic excitations may provide an avenue for exploring exotic physical phenomena. Here, Xu et al . observe a Fano resonance in the Weyl semimetal TaAs, revealing evidence for a strong coupling between phonons and Weyl fermions.