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The schematic diagram of the heterojunction composed of two semi-infinite monohydrogenated (M) and dihydrogenated (D) ZGNRs: (a) top view; (b) side view; (c) under zero magnetic field; (d) under a uniformly applied magnetic field; (e) with the magnetic fields pointed to opposite directions in the two nanoribbons. The arrows indicate the directions of the edge magnetic moments.
The transmission function (left panel) and band structure of the leads (right panel) under zero magnetic field for: (a) system M-M; (b) system D-D; (c) system M-D. The right panel in (c) shows the band structures of the left lead (L) and the right lead (R). Due to spin degeneracy in the AFM state, only spin channel is presented.
The transmission function (left panel) under a uniform magnetic field in: (a) system M-M; (b) system D-D; (c) system M-D. Also shown (right panel) are the band structures of the leads. and are the two spin channels. Note that in the right panel of (c), the band structures of the left (L) and right (R) leads for only spin channel are shown. (d), (e) The wave function of the and state in monohydrogenated ZGNRs. (f), (g) The wave function of the and state in dihydrogenated ZGNRs. indicates the symmetry axis along the longitudinal direction.
(a) The transmission function (left panel) in the case with anti-parallel (AP) magnetic fields applied. Also shown (right panel) are the band structures of the left (L) and right (R) leads in the spin channel. (b) The I-V curves for the cases with parallel (P) and anti-parallel magnetic fields.
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