Energy-level pinning and the 0.7 spin state in one dimension: GaAs quantum wires studied using finite-bias spectroscopy

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dc.creatorGraham, A. C.
dc.creatorSawkey, D. L.
dc.creatorPepper, M.
dc.creatorSimmons, M. Y.
dc.creatorRitchie, D. A.
dc.date2007-08-24
dc.date.accessioned2026-07-07T08:25:27Z
dc.date.available2026-07-07T08:25:27Z
dc.descriptionWe study the effects of electron-electron interactions on the energy levels of GaAs quantum wires (QWs) using finite-bias spectroscopy. We probe the energy spectrum at zero magnetic field, and at crossings of opposite-spin-levels in high in-plane magnetic field B. Our results constitute direct evidence that spin-up (higher energy) levels pin to the chemical potential as they populate. We also show that spin-up and spin-down levels abruptly rearrange at the crossing in a manner resembling the magnetic phase transitions predicted to occur at crossings of Landau levels. This rearranging and pinning of subbands provides a phenomenological explanation for the 0.7 structure, a one-dimensional (1D) nanomagnetic state, and its high-B variants.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0708.3373
dc.identifierhttp://arxiv.org/abs/0708.3373
dc.identifierPhys. Rev. B 75, 035331 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.035331
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136657
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleEnergy-level pinning and the 0.7 spin state in one dimension: GaAs quantum wires studied using finite-bias spectroscopy
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