Resistively detected NMR line shapes in a quasi-one-dimensional electron system

作者：Fauzi M H; Singha A; Sahdan M F; Takahashi M; Sato K; Nagase K; Muralidharan B; Hirayama Y

来源：PHYSICAL REVIEW B, 2017, 95(24): 241404.

DOI：10.1103/PhysRevB.95.241404

We observe variation in the resistively detected nuclear magnetic resonance (RDNMR) line shapes in quantum Hall breakdown. The breakdown occurs locally in a gate-defined quantum point contact (QPC) region. Of particular interest is the observation of a dispersive line shape occurring when the bulk two-dimensional electron gas (2DEG) set to nu(b) = 2 and the QPC filling factor to the vicinity of nu(QPC) = 1, strikingly resemble the dispersive line shape observed on a 2D quantum Hall state. This previously unobserved line shape in a QPC points to a simultaneous occurrence of two hyperfine-mediated spin flip-flop processes within the QPC. Those events give rise to two different sets of nuclei polarized in the opposite direction and positioned at a separate region with different degrees of electronic spin polarization.

• 出版日期2017-6-9