Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-26
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages
Scientific paper
Nuclear spin polarization is typically generated in GaAs quantum point contacts (QPCs) when an out-of-plane magnetic field gives rise to spin-polarized quantum Hall edge states, and a voltage bias drives transitions between the edge states via electron-nuclear flip-flop scattering. Here, we report a similar effect for QPCs in an in-plane magnetic field, where currents are spin polarized but edge states are not formed. The nuclear polarization gives rise to hysteresis in the d.c. transport characteristics, with relaxation timescales around 100 seconds. The dependence of anomalous QPC conductance features on nuclear polarization provides a useful test of their spin-sensitivity.
Folk Joshua A.
Frolov Sergey M.
Ren Yan-Yu
Wegscheider Werner
Yu Wenfei
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