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(Top) Top view of the edge channels (EC): the electron system is separated into compressible (gray) and incompressible (white) strips in the presence of screening effect (Ref. 10 ). (Middle) Diagrams of the local electron density near the QH edge channels with (solid curves) and without (dashed curves) an external magnetic field. (Bottom) The local electron spin polarization .
(Color online) (a) Calculated vs for , , , , , and . The DNP is formed in the region around . When the nuclear spins are polarized at , the DNP is formed at (blue line). The 2DES depth from the surface is and the pinch-off voltage is . (b) The calculated from Eq. (1) at for various . The inset shows the cross-sectional illustration of the 2DES near the SG.
(Color online) NMR spectra detected by the change in the Hall resistance for nuclei. The DNP is formed at and the is applied at various . The blue lines show the Gaussian curves.
Plot of as a function of . The dashed curve represents a guide line. The inset shows the calculated .
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