Shot noise in magnetic field modulated graphene superlattice |
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| Affiliation: | 1. Department of Engineering Mechanics, Northwestern Polytechnical University, Xi''an 710072, PR China;2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi''an 710064, PR China;1. State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, People''s Republic of China;2. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People''s Republic of China;3. Jinan Institute of Quantum Technology, SAICT, Jinan 250101, People''s Republic of China;1. College of Applied Sciences, Beijing University of Technology, Beijing 100122, China;2. Department of Physics, Tsinghua University, Beijing 100084, China;1. SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Southeast University, Nanjing 210096, People''s Republic of China;2. Center for Advanced Carbon Materials, Southeast University and Jiangnan Graphene Research Institute, Changzhou 213100, People''s Republic of China;3. Center for Advanced Materials and Manufacture, Joint Research Institute of Southeast University and Monash University, Suzhou 215123, People''s Republic of China |
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| Abstract: | We investigate the shot noise properties in a monolayer graphene superlattice modulated by N parallel ferromagnets deposited on a dielectric layer. It is found that for the antiparallel magnetization configuration or when magnetic field is zero the new Dirac-like point appears in graphene superlattice. The transport is almost forbidden at this new Dirac-like point, and the Fano factor reaches its maximum value 1/3. In the parallel magnetization configuration as the number of magnetic barriers increases, the shot noise increases. In this case, the transmission can be blocked by the magnetic–electric barrier and the Fano factor approaches 1, which is dramatically distinguishable from that in antiparallel alignment. The results may be helpful to control the electron transport in graphene-based electronic devices. |
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| Keywords: | Graphene superlattice Shot noise Fano factor Dirac point |
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