Interaction Effects at Crossings of Spin-Polarised One-Dimensional Subbands

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dc.creatorGraham, A. C.
dc.creatorThomas, K. J.
dc.creatorPepper, M.
dc.creatorCooper, N. R.
dc.creatorSimmons, M. Y.
dc.creatorRitchie, D. A.
dc.date2003-08-26
dc.date.accessioned2026-07-07T02:53:08Z
dc.date.available2026-07-07T02:53:08Z
dc.descriptionWe report conductance measurements of ballistic one-dimensional (1D) wires defined in GaAs/AlGaAs heterostructures in an in-plane magnetic field, B. When the Zeeman energy is equal to the 1D subband energy spacing, the spin-split subband N(up-spin) intersects (N+1)(down-spin), where N is the index of the spin-degenerate 1D subband. At the crossing of N=1(up-spin) and N=2(down-spin) subbands, there is a spontaneous splitting giving rise to an additional conductance structure evolving from the 1.5(2e^2/h) plateau. With further increase in B, the structure develops into a plateau and lowers to 2e^2/h. With increasing temperature and magnetic field the structure shows characteristics of the 0.7 structure. Our results suggest that at low densities a spontaneous spin splitting occurs whenever two 1D subbands of opposite spins cross.
dc.description4 pages, 4 figures, to be published in Physical Review Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0308550
dc.identifierhttp://arxiv.org/abs/cond-mat/0308550
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22092
dc.subjectMesoscale and Nanoscale Physics
dc.titleInteraction Effects at Crossings of Spin-Polarised One-Dimensional Subbands
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