Spintronic performance of bent zigzag phosphorene nanoribbons: effects of mechanical deformation and gate voltage.

This study explores the spintronic properties of an innovative device incorporating in-plane bent zigzag phosphorene nanoribbons (ZPNRs). The device features ZPNRs with a channel length of 23.4 nm, bent into circular arcs with varying curvatures.

Spin thermoelectric properties induced by hydrogen impurities in zigzag graphene nanoribbons.

This study investigates the impact of hydrogen impurities on the spin-dependent thermoelectric properties of zigzag graphene nanoribbons (ZGNRs) through density functional theory and the Landauer-Büttiker formula. Hydrogenation induces a net magnetism with a localized spin-dependent band around the Fermi energy in ZGNRs with different spin configurations, such as antiferromagnetic and ferromagnetic states. The results reveal spin-semiconducting behavior with a tunable energy gap and fully spin-polarized states in certain energy ranges.

Electrical control of the spin-Seebeck coefficient in graphene nanoribbons with asymmetric zigzag edge extensions.

We investigate the effect of the electric field on the spin-dependent thermoelectric properties of graphene nanoribbons with asymmetric zigzag edge extensions. The Hubbard Hamiltonian predicts spin-semiconducting behavior with localized band structures due to the magnetic properties of the zigzag edge extensions. Applying a temperature gradient induces thermal spin-dependent currents, pure spin currents, and large spin-Seebeck coefficients, which are similar to other graphene-based structures.

Fully spin-valley-polarized current induced by electric field in zigzag stanene and germanene nanoribbons.

We theoretically investigated the spin-dependent valleytronics in stanene and germanene nanoribbons, considering the electron-electron interaction and the external electric field without any magnetic exchange element. Our results showed that applying an electric field in these two-dimensional materials with a large intrinsic spin-orbit coupling can provide a versatile platform to create spin-valley currents by exploiting the edge magnetism at their zigzag edges. Generally, manipulating the electric field can generate a fully spin-valley-polarized current with a large magnitude even at room temperature.

Thermal magnetoresistance and spin thermopower in C dimers.

We theoretically investigate the spin-related thermoelectric properties in C dimer bridged between zigzag graphene nanoribbon electrodes using the tight-binding model, equilibrium Green's function method, and Landauer-Büttiker transport formalism. By applying a thermal gradient, our proposed device could generate a notable spin thermopower. Moreover, by switching the magnetization of the electrodes, different spin currents, and giant thermal magnetoresistance (MR) can be achieved.

Armchair graphene nanoribbons with giant spin thermoelectric efficiency.

Spin-caloritronic effects in armchair graphene nanoribbons (AGNRs) with various ribbon widths and periodic structural defects in the form of triangular antidots were systematically studied. Our results showed that by engineering defects in AGNRs, one could not only reduce the phononic thermal conductance for enhancing the thermoelectric efficiency, but also induce a ferromagnetic ground state. Interestingly, AGNRs with triangular antidots exhibit spin-semiconducting behavior with a tunable spin gap and a narrow spin-polarized band around the Fermi level.