Abstract
By performing first-principle quantum transport calculations, we studied the electronic and transport properties of zigzag α-graphyne nanoribbons in different magnetic configurations. We designed the device based on zigzag α-graphyne nanoribbon and studied the spin-dependent transport properties, whose current-voltage curves show obvious spin-polarization and conductance plateaus. The interesting transport behaviours can be explained by the transport spectra under different magnetic configurations, which basically depends on the symmetry matching of the electrodes’ bandstructures. Simultaneously, spin Seebeck effect is also found in the device. Thus, according to the transport behaviours, zigzag α-graphyne nanoribbons can be used as a dual spin filter diode, a molecule signal converter and a spin caloritronics device, which indicates that α-graphyne is a promising candidate for the future application in spintronics.
Highlights
We study the electronics, spintronics and spin caloritronics properties of a particular Zα-GYNR, discussing the mechanism and designing several nanodevices based on the transport characteristics
The intersecting solid straight lines are referred to the bias window, and From Eq (1), we know that the current is determined by the corresponding integral area of the transmission coefficient within the bias window
Seen from the spin-up transmission spectra of FM state (Fig. 6(a)), when the bias is zero, the transmission coefficient of the transport channel is quite large at Fermi level, so the current increases rapidly once the bias is applied, and keeps growth when the bias window increases within region I (V < 0.1 V)
Summary
For FM and AFM states, the whole device is polarized, including the leads and the scattering region, and the calculated I-V curves of Zα-GYNR are shown in Fig. 3(a,b) respectively. Besides the nanodevices mentioned above, we can design spin caloritronics device[43,44] based on the Zα-GYNR, whose appearance is the same as the device shown, only the bias voltage is replaced by a temperature gradient. It is clearly seen that the spin-polarized currents are generated without any bias voltage, wherein the spin-up current is negative and the spin-down one is positive This is an obvious spin Seebeck effect since the spin-up and spin-down currents flow in opposite directions, which are generated only from a temperature gradient[45,46,47]. Note that the effect of the phonon is neglected in our calculation and we mainly focus on the electron transmission
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