ARPES shows SrTiO3 surface bandgap shrinks 390 meV with electron doping and exhibits negative electronic compressibility via valence band shift to lower energies, supported qualitatively by DFT.
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Direct observation of surface bandgap shrinkage and negative electronic compressibility in SrTiO3
ARPES shows SrTiO3 surface bandgap shrinks 390 meV with electron doping and exhibits negative electronic compressibility via valence band shift to lower energies, supported qualitatively by DFT.