Direct observation of excitonic instability in Ta2NiSe5

Volume: 12, Issue: 1
Published: Mar 30, 2021
Abstract
Coulomb attraction between electrons and holes in a narrow-gap semiconductor or a semimetal is predicted to lead to an elusive phase of matter dubbed excitonic insulator. However, direct observation of such electronic instability remains extremely rare. Here, we report the observation of incipient divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 using Raman spectroscopy. Critical fluctuations of the excitonic...
Paper Details
Title
Direct observation of excitonic instability in Ta2NiSe5
Published Date
Mar 30, 2021
Volume
12
Issue
1
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