Abstract
The localized Majorana mode, an electronic condensed matter quasiparticle excitation, represents a possible candidate to resolve the decoherence-intolerant problem faced by conventional quantum computers. It is the core subject of study in this work. This work searches for localized Majorana modes in various topological superconductors, including Bi2Te3/Fe1+yTe nanowire/nanoribbons, an Sb2Te3/Fe1+yTe nanoribbon, a Nb/Quantum Anomalous Hall Insulator (Nb/QAHI) nanocut, a 2D MoSe2/NbSe2/MoSe2 heterostructure, as well as a 2D MnTe/Mo2C-Mo2C heterostructure. The theories on how these devices can host localized Majorana modes will be introduced first, followed by the experimental results from devices fabricated from these heterostructures. Experimental evidence suggests the possible existence of localized Majorana mode in Bi2Te3/Fe1+yTe nanowire/nanoribbons, the 2D MoSe2/NbSe2/MoSe2 heterostructure and 2D MnTe/Mo2C-Mo2C heterostructure. In addition, unconventional superconductivity is demonstrated in the Sb2Te3/Fe1+yTe nanoribbon as well as the 2D MnTe/Mo2C-Mo2C heterostructure. However, the theoretically predicted signature of a localized Majorana mode in Nb/QAHI nanocut was not observed.