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Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance
Minoru Kawamura1, Keiji Ono1, Peter Stano1,2
1RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
Abstract:
We report an electronic magnetization measurement of a quantum point contact (QPC) based on nuclear magnetic resonance (NMR) spectroscopy. We find that NMR signals can be detected by measuring the QPC conductance under in-plane magnetic fields. This makes it possible to measure, from Knight shifts of the NMR spectra, the electronic magnetization of a QPC containing only a few electron spins. The magnetization changes smoothly with the QPC potential barrier height and peaks at the conductance plateau of 0.5×2e^{2}/h. The observed features are well captured by a model calculation assuming a smooth potential barrier, supporting a no bound state origin of the 0.7 structure.
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