Doping-induced dimensional crossover and thermopower burst in Nb-doped SrTiO3 superlattices (Articolo in rivista)

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  • Doping-induced dimensional crossover and thermopower burst in Nb-doped SrTiO3 superlattices (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.88.045310 (literal)
Alternative label
  • Delugas, P.a, Filippetti, A.a, Verstraete, M.J.b, Pallecchi, I.c, Marré, D.c, Fiorentini, V.d (2013)
    Doping-induced dimensional crossover and thermopower burst in Nb-doped SrTiO3 superlattices
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Delugas, P.a, Filippetti, A.a, Verstraete, M.J.b, Pallecchi, I.c, Marré, D.c, Fiorentini, V.d (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84881165928&partnerID=q2rCbXpz (literal)
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  • 88 (literal)
Rivista
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  • 4 (literal)
Note
  • Scopu (literal)
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  • a CNR-IOM, UOS Cagliari, S. P. Monserrato-Sestu Km. 0.700, 09042 Monserrato (CA), Italy b Département de Physique, B5a, Université de Liège, B-4000 Sart-Tilman, Belgium c CNR-SPIN UOS Genova, Dipartimento di Fisica, Via Dodecaneso 33, 16146 Genova, Italy d CNR-IOM, UOS Cagliari and Dipartimento di Fisica, Università di Cagliari, 09042 Monserrato (CA), Italy (literal)
Titolo
  • Doping-induced dimensional crossover and thermopower burst in Nb-doped SrTiO3 superlattices (literal)
Abstract
  • Using advanced ab initio calculations, we describe the formation and confinement of a two-dimensional electron gas in short-period (4-nm) Nb-doped SrTiO3 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. © 2013 American Physical Society. (literal)
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