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Direct observation of strain-induced orbital valence band splitting in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>HfSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> by sodium intercalation
By using angle-resolved photoemission spectroscopy (ARPES), the variation of the electronic structure of ${\mathrm{HfSe}}_{2}$ has been studied as a function of sodium intercalation. We observe how this drives a band splitting of the $p$-orbital valence bands and a simultaneous reduction of the indirect band gap by values of up to …