In order to development the low-power-consumption electronic devices, we studied a heterojunction composed of a 5,4-sawtooth graphene nanoribbon and a 6,6,12-graphyne nanoribbon, by using first-principle calculations combined with the non-equilibrium...

N2O molecule is chemically adsorbed on the surface of Ni-doped penta-graphene only when the Ni atom is doped at the sp2 hybridized carbon site. External perpendicular electric field can enhance the adsorption performance.

By using first-principle calculations combined with the non-equilibrium Green’s function approach, we studied the spin caloritronic properties of zigzag graphene nanoribbons with a nanobubble at the edge (NB-ZGNRs). The thermal spin-polarized currents can be induced by a temperature difference, and the spin Seebeck effect is found in the nanoribbon. The spin polarization, magnetoresistance, and Seebeck coefficients are discussed, which are strongly affected and can be tuned by the geometrical strain. Moreover, some novel spin caloritronic devices are designed, such as a device that generates bidirectional perfect spin currents and thermally induced giant magnetoresistances. Our results open up the possibility of tuning the spin caloritronic properties of the NB-ZGNR-based devices by changing the elastic strain on the graphene nanobubble.

We investigate the electronic-current-induced heat generation in a double quantum dot connected by two normal leads. The dots are coupled in series with a coupling strength 𝑡 d . It is found that, at zero temperature and weak dot-lead coupling, 𝑡 d affects the heating and current heavily. In particular, the effects on the heat generation and on the current are quite different. For example, at a heating valley the current can exhibit a deep valley, a plateau, or a high peak depending on 𝑡 d . As a result, we can find an ideal working condition, large current while small heating, for the double dots system by tuning the interdot coupling strength.

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