Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)
- 2016.02a
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- Pages.125.1-125.1
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- 2016
Direct observation of delocalized exciton state in Ta2 NiSe5: direct evidence of the excitonic insulator state
Abstract
The excitonic insulator (EI), which is one of fundamental insulators, was theoretically proposed in 1967 but its material realization has not been established well. Only a few materials were proposed as EIs but their experimental evidences were indirect such as the renormalization of band dispersions or an anomaly in electrical resistivity. We conducted scanning tunneling microscopy / spectroscopy measurements and found out that