Origin of light-induced metastability in ZrTe_5
arxiv(2024)
摘要
We study the non-equilibrium electronic structure of a model Dirac semimetal
ZrTe_5 by using time-and-angle resolved photoemission spectroscopy and
density functional theory-based electron and phonon calculations. By measuring
the electronic dispersion near the Γ point at time delays up to 10
picoseconds, we discovered that the band spectral weight does not recover
during the measured temporal window, revealing the existence of light induced
metastable state in the electronic structure of this material. Our calculations
find that the photoexcited A_1g phonon mode lead to a band renormalization
that both supports our experimental observations at the zone center and
predicts changes to the band structure outside of our experimental window,
ultimately showing the evolution from a direct to an indirect gap semimetal;
such band renormalization dramatically reduces the electron-hole recombination
rate giving rise to the metastability in this system.
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