A robust effect of the defect on the switching behavior in carbon-based molecular device
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ORIGINAL PAPER
A robust effect of the defect on the switching behavior in carbon-based molecular device Hamed Beyramienanlou 1 & Hamid Vahed 1 Received: 8 April 2020 / Accepted: 30 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, we investigate the effects of spin-dependent electron and defect in the carbon-based molecular device. Our proposed molecular device is designed by two carbon chains, which is bonded to a defect. The defect topology includes pentagonal and octagonal carbon rings, which is put between two zigzag-edged graphene nanoribbon (ZGNR). The spin effect and switching symbiosis are shown in this carbon-based device. By switching of the orientation of the defect in two states (S1/S2 states) relative to the two electrodes, the full spin effect is shown. Also, we report the obvious negative differential resistance (NDR) behavior in our proposed molecular device. The results suggest that the proposed composition significantly affects the ratio of current and voltage, which the maximum peak of current (S2 state) is lower than 0.0022 μA and could have a potential application in the next generation of molecular circuits. Keywords Graphene . Switching . Dual spin filtering . Defect . NDR
Introduction In recent years, due to the demand for minimization of microelectronic devices, researches have been focused on nanoparticles [1]. The device of single-molecule spintronics has become one of the most important topics in the next generation of electronic devices. Therefore, many theoretical and empirical researches have been provided in molecular electronic devices, especially in mechanical controlled switches, and many special phenomena have been reported in these devices, such as spin filtering effect [1–3], spin selective electron transmitted through a magnetic layer [4], dual spin filter [5], spin crossover [6, 7], negative differential resistance (NDR) [8], and spin valve [9–11]. Mechanical controlled molecular switches have great potential for applications in high-density data storage and quantum computing [12]. The strength of the current in the molecular devices is controlled by the molecular switch between the high conductance (S1) and the low
* Hamid Vahed [email protected] Hamed Beyramienanlou [email protected] 1
School of Engineering Emerging Technologies, University of Tabriz, Tabriz, Iran
conductance (S2) states [13].. Many effective approaches have been introduced to create the automatic conductance switching in the devices by redox reaction [14], electric field [15], scanning tunneling microscopy (STM) [16], and electron holes [17]. The fast response time makes the photochromic molecular switching to attract a lot of attention [18]. Graphene, as a two-dimensional layer of carbon atoms, has shown unique individual properties such as nanoscale thickness, tunable electrical conductivity, and good ballistic transmission. The family of two-dimensional materials can contain many elements, which provide a wide range of electronic and ph
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