Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
arXiv:2107.08240 · doi:10.1038/s41598-021-94842-w
Abstract
The main contribution of this paper is to study the spin caloritronic effects in defected graphene/silicene nanoribbon (GSNR) junctions. Each step-like GSNR is subjected to the ferromagnetic exchange and local external electric fields, and their responses are determined using the nonequilibrium Greens function (NEGF) approach. To further study the thermoelectric (TE) properties of the GSNRs, three defect arrangements of divacancies (DVs) are also considered for a larger system, and their responses are re-evaluated. The results demonstrate that the defected GSNRs with the DVs can provide an almost perfect thermal spin filtering effect (SFE), and spin switching. A negative differential thermoelectric resistance (NDTR) effect and high spin polarization efficiency (SPE) larger than 99.99 percent are obtained. The system with the DV defects can show a large spin-dependent Seebeck coefficient, equal to 1.2 mV/K, which is relatively large and acceptable. Appropriate thermal and electronic properties of the GSNRs can also be obtained by tuning up the DV orientation in the device region. Accordingly, the step-like GSNRs can be employed to produce high efficiency spin caloritronic devices with various features in practical applications.
23 pages, 9 figures
References in corpus (14)
- Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect Transistors
- Vacancy induced magnetism in graphene and graphene ribbons
- Room-temperature ballistic transport in narrow graphene strips
- Oriented Graphene Nanoribbons Embedded in Hexagonal Boron Nitride Trenches
- Towards Chirality Control of Graphene Nanoribbons Embedded in Hexagonal Boron Nitride
- Spin filtering in CrI tunnel junctions
- Realization of free-standing silicene using bilayer graphene
- Giant magnetoresistance and spin Seebeck coefficient in zigzag a-graphyne nanoribbons
- Vacancy Effects on Electric and Thermoelectric Properties of Zigzag Silicene Nanoribbons
- Thermal transport across grain boundaries in polycrystalline silicene: a multiscale modeling
- Strain and Water Effects on the Electronic Structure and Chemical Activity of In-Plane Graphene/Silicene Heterostructure
- Spin and charge caloritronics in bilayer graphene flakes with magnetic contacts
- Tunable electronic properties and electric-field-induced phase transition in phosphorene/graphene heterostructures
- Highly tunable charge transport in defective graphene nanoribbons under external local forces and constraints: A hybrid computational study