English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Excitonic insulator (EI) was proposed in 60's as a distinct insulating stateoriginating from pure electronic interaction, but its material realization hasbeen elusive with extremely few material candidates and with only limitedevidence such as anomalies in transport properties, band dispersions, oroptical transitions. We investigate the real-space electronic states of the lowtemperature phase in Ta$_2$NiSe$_5$ with an atomic resolution to clearlyidentify the quasiparticle energy gap together with the strong electron-holeband renormalization using scanning tunneling microscopy (STM) and spectroscopy(STS). These results are in good agreement with the EI transition scenario inTa$_2$NiSe$_5$. Our spatially-resolved STS data and theoretical calculationsreveal further the orbital inversion at band edges, which indicates the excitoncondensation close to the Bardeen-Cooper-Schrieffer regime.

Strong interband interaction in the excitonic insulator phase of Ta$_2$NiSe$_5$