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

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

2003-08-26

arxiv.org/abs/cond-mat/0308550v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, to be published in Physical Review Letters

Scientific paper

We 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.

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