http://www.cnr.it/ontology/cnr/individuo/prodotto/ID310697
Long-lived spin plasmons in a spin-polarized two-dimensional electron gas (Articolo in rivista)
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- Label
- Long-lived spin plasmons in a spin-polarized two-dimensional electron gas (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.90.155409 (literal)
- Alternative label
Agarwal, Amit[ 1 ] ; Polini, Marco[ 2,3 ] ; Vignale, Giovanni)[ 4 ] (2014)
Long-lived spin plasmons in a spin-polarized two-dimensional electron gas
in Physical review. B, Condensed matter and materials physics
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Agarwal, Amit[ 1 ] ; Polini, Marco[ 2,3 ] ; Vignale, Giovanni)[ 4 ] (literal)
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- [ 1 ] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India
[ 2 ] Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy
[ 3 ] CNR, Ist Nanosci, I-56126 Pisa, Italy
[ 4 ] Univ Missouri, Dept Phys, Columbia, MO 65211 USA
[ 5 ] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[ 6 ] Univ Iowa, Opt Sci & Technol Ctr, Iowa City, IA 52242 USA (literal)
- Titolo
- Long-lived spin plasmons in a spin-polarized two-dimensional electron gas (literal)
- Abstract
- Collective charge-density modes (plasmons) of the clean two-dimensional unpolarized electron gas are stable, for momentum conservation prevents them from decaying into single-particle excitations. Collective spin-density modes (spin plasmons) possess no similar protection and rapidly decay by production of electron-hole pairs. Nevertheless, if the electron gas has a sufficiently high degree of spin polarization (P>1/7, where P is the ratio of the equilibrium spin density and the total electron density, for a parabolic single-particle spectrum) we find that a long-lived spin plasmon - a collective mode in which the densities of up and down spins oscillate with opposite phases - can exist within a \"pseudogap\" of the single-particle excitation spectrum. The ensuing collectivization of the spin excitation spectrum is quite remarkable and should be directly visible in Raman-scattering experiments. The predicted mode could dramatically improve the efficiency of coupling between spin-wave-generating devices, such as spin-torque oscillators. (literal)
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