Off-Fermi surface cancellation effects in spin-Hall conductivity of a two-dimensional Rashba electron gas (Articolo in rivista)

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  • Off-Fermi surface cancellation effects in spin-Hall conductivity of a two-dimensional Rashba electron gas (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.73.081303 (literal)
Alternative label
  • C. Grimaldi (1,2); E. Cappelluti (3,4); F. Marsiglio (2,5) (2006)
    Off-Fermi surface cancellation effects in spin-Hall conductivity of a two-dimensional Rashba electron gas
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Grimaldi (1,2); E. Cappelluti (3,4); F. Marsiglio (2,5) (literal)
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  • 081303(R) (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.73.081303 (literal)
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  • 73 (literal)
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  • 4 (literal)
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  • 8 (literal)
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  • Scopu (literal)
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  • (1) LPM, Ecole Polytechnique Fédérale de Lausanne, Station 17, CH-1015 Lausanne, Switzerland (2) DPMC, Université de Genève, 24 Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland (3) Istituto dei Sistemi Complessi, CNR-INFM, via dei Taurini 19, 00185 Roma, Italy (4) Dipartimento di Fisica, Università \"La Sapienza,\" Piazzale Aldo Moro 2, 00185 Roma, Italy (5) Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1 (literal)
Titolo
  • Off-Fermi surface cancellation effects in spin-Hall conductivity of a two-dimensional Rashba electron gas (literal)
Abstract
  • We calculate the spin-Hall conductivity of a disordered two-dimensional Rashba electron gas within the self-consistent Born approximation and for arbitrary values of the electron density, parametrized by the ratio E-F/E-0, where E-F is the Fermi level and E-0 is the spin-orbit energy. We confirm earlier results indicating that in the limit E-F/E-0 > 1 the vertex corrections suppress the spin-Hall conductivity. However, for sufficiently low electron density such that E-F less than or similar to E-0, we find that the vertex corrections no longer cancel the contribution arising from the Fermi surface, and they cannot therefore suppress the spin current. This is instead achieved by contributions away from the Fermi surface, disregarded in earlier studies, which become large when E-F less than or similar to E-0. (literal)
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