Signature of an ultrafast photoinduced Lifshitz transition in the nodal-line semimetal ZrSiTe

Robert J. Kirby, Lukas Muechler, Sebastian Klemenz, Caroline Weinberg, Austin Ferrenti, Mohamed Oudah, Daniele Fausti, Gregory D. Scholes, Leslie Mareike Schoop

Research output: Contribution to journalArticlepeer-review

Abstract

Here we report an ultrafast optical spectroscopic study of the nodal-line semimetal ZrSiTe. Our measurements reveal that, converse to other compounds of the family, the sudden injection of electronic excitations results in a strongly coherent response of an A1g phonon mode that dynamically modifies the distance between Zr and Te atoms and Si layers. "Frozen phonon"density functional theory calculations, in which band structures are calculated as a function of nuclear position along the phonon mode coordinate, show that large displacements along this mode alter the material's electronic structure significantly, forcing bands to approach and even cross the Fermi energy. The incoherent part of the time-domain response reveals that a delayed electronic response at low fluence discontinuously evolves into an instantaneous one for excitation densities larger than 3.43×1017cm-3. This sudden change of the dissipative channels for electronic excitations is indicative of an ultrafast Lifshitz transition, which we tentatively associate with a change in topology of the Fermi surface driven by a symmetry-preserving A1g phonon mode.

Original languageEnglish (US)
Article number205138
JournalPhysical Review B
Volume103
Issue number20
DOIs
StatePublished - May 19 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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