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. 2014 Mar 3;111(11):3933–3937. doi: 10.1073/pnas.1318304111

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Fig. 2. — Effect of quantum confinement on the electronic structure of (001)- and (110)-oriented SrTiO₃. (A and B) Schematics of the Ti lattice in SrTiO₃ oriented along the [001] and [110] direction, respectively. Ti orbital lobes expand in the y–z plane. Large and small hopping amplitudes depend on the overlap of the nearest-neighbor d orbitals. (C) Bulk band structure of SrTiO₃, consisting of a heavy band (red) and light bands (blue) along , as well as a light band (blue) and semilight bands (red) along . (D and E) Quantum well states (or subbands) of SrTiO₃ confined along the [001] and [110] direction, respectively. The band dispersions of all the quantum well states confined in the (001) direction are the same as in the bulk. Confinement along (110) is different: here the band becomes semiheavy along the direction and the different (110)-quantum-confined states have a different mass. (F) 2D Brillouin zone of the SrTiO₃(110) surface.

Inline graphic — Effect of quantum confinement on the electronic structure of (001)- and (110)-oriented SrTiO₃. (A and B) Schematics of the Ti lattice in SrTiO₃ oriented along the [001] and [110] direction, respectively. Ti orbital lobes expand in the y–z plane. Large and small hopping amplitudes depend on the overlap of the nearest-neighbor d orbitals. (C) Bulk band structure of SrTiO₃, consisting of a heavy band (red) and light bands (blue) along , as well as a light band (blue) and semilight bands (red) along . (D and E) Quantum well states (or subbands) of SrTiO₃ confined along the [001] and [110] direction, respectively. The band dispersions of all the quantum well states confined in the (001) direction are the same as in the bulk. Confinement along (110) is different: here the band becomes semiheavy along the direction and the different (110)-quantum-confined states have a different mass. (F) 2D Brillouin zone of the SrTiO₃(110) surface.