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- W2159631744 abstract "Using advanced ab initio calculations, we describe the formation and confinement of a two-dimensional electron gas in short-period ($ensuremath{simeq}$4-nm) Nb-doped SrTiO${}_{3}$ superlattices as a function of Nb doping. We predict complete two-dimensional confinement for doping concentrations higher than 70$%$. In agreement with previous observations, we find a large thermopower enhancement at room temperature. However, this effect is primarily determined by dilution of the mobile charge over a multitude of weakly occupied bands. As a general rule, we conclude that thermopower in similar heterostructures will be more enhanced by weak, rather than tight, spatial confinement." @default.
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- W2159631744 date "2013-07-12" @default.
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- W2159631744 title "Doping-induced dimensional crossover and thermopower burst in Nb-doped SrTiO<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>superlattices" @default.
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- W2159631744 doi "https://doi.org/10.1103/physrevb.88.045310" @default.
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