Cascaded Spintronic Logic with Low-Dimensional Carbon
Joseph S. Friedman, Anuj Girdhar, Ryan M. Gelfand, Gokhan Memik, Hooman Mohseni, Allen Taflove, Bruce W. Wessels, Jean‐Pierre Leburton, Alan Varteres Sahakian · 2023
Remarkable breakthroughs have established the functionality of graphene and carbon nanotube transistors as replacements to silicon in conventional computing structures, and numerous spintronic logic gates have been presented. This chapter introduces a cascaded spintronic computing system composed solely of low-dimensional carbon materials. Covalently connected carbon nanotubes create magnetic fields through graphene nanoribbons, cascading logic gates through incoherent spintronic switching. All-carbon spin logic permits the development of cascaded spintronic logic circuits composed solely of low-dimensional carbon materials without intermediate circuits between gates, resulting in compact circuits with reduced area that are far more efficient than CMOS. By exploiting the exotic behaviour of graphene nanoribbons and carbon nanotubes, all-carbon spin logic enables a spintronic paradigm for the next generation of high-performance computing. In the mean-field approximation, the expectation of the on-site occupation is used to reduce the complexity of the Hamiltonian, which can be solved with iterative methods.