title: Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance.
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.
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Kawamura
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
authors.forename: Keiji
authors.initials: K
authors.lastname: Ono
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.|Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia.
authors.forename: Peter
authors.initials: P
authors.lastname: Stano
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
authors.forename: Kimitoshi
authors.initials: K
authors.lastname: Kono
authors.affiliation: Department of Electrical and Electronic Engineering, Ibaraki University, Hitachi 316-8511, Japan.
authors.forename: Tomosuke
authors.initials: T
authors.lastname: Aono