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Kawamura M, Ono K, Stano P, et al. Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance. Phys Rev Lett. 2015;115(3):036601doi: 10.1103/PhysRevLett.115.036601.
Kawamura, M., Ono, K., Stano, P., Kono, K., & Aono, T. (2015). Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance. Physical review letters, 115(3), 036601. https://doi.org/10.1103/PhysRevLett.115.036601
Kawamura, Minoru, et al. "Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance." Physical review letters vol. 115,3 (2015): 036601. doi: https://doi.org/10.1103/PhysRevLett.115.036601
Kawamura M, Ono K, Stano P, Kono K, Aono T. Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance. Phys Rev Lett. 2015 Jul 17;115(3):036601. doi: 10.1103/PhysRevLett.115.036601. Epub 2015 Jul 13. PMID: 26230812.
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Phys Rev Lett. 2015 Jul 17;115(3):036601. doi: 10.1103/PhysRevLett.115.036601. Epub 2015 Jul 13.

Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance.

Physical review letters

Minoru Kawamura, Keiji Ono, Peter Stano, Kimitoshi Kono, Tomosuke Aono

Affiliations

  1. RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan.
  2. Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia.
  3. Department of Electrical and Electronic Engineering, Ibaraki University, Hitachi 316-8511, Japan.

PMID: 26230812 DOI: 10.1103/PhysRevLett.115.036601

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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