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Nuclear polarization in quantum point contacts in an in-plane magnetic field

Nuclear polarization in quantum point contacts in an in-plane magnetic field

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 …