Growing thin SrTiO3 films on Nb-doped SrTiO3 substrates tunes the surface 2DEG band filling, and for 0.5% Nb doping the Fermi level sits in the Zeeman gap, leaving a single spin-polarized Fermi surface.
A8 shows the Sr 3d and Ti 3p XPS spectra of the STO crystal, 20 u.c
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Single spin-polarised Fermi surface in SrTiO$_3$ thin films
Growing thin SrTiO3 films on Nb-doped SrTiO3 substrates tunes the surface 2DEG band filling, and for 0.5% Nb doping the Fermi level sits in the Zeeman gap, leaving a single spin-polarized Fermi surface.