Topological properties of finite-size heterostructures of magnetic topological insulators and superconductors
arxiv(2024)
摘要
Heterostructures of magnetic topological insulators (MTIs) and
superconductors (SCs) in two-dimensional (2D) slab and one-dimensional (1D)
nanoribbon geometries have been predicted to host, respectively, chiral
Majorana edge states (CMESs) and Majorana bound states (MBSs). We study the
topological properties of such MTI/SC heterostructures upon variation of the
geometry from wide slabs to quasi-1D nanoribbon systems and as a function of
the chemical potential, the magnetic doping, and the induced superconducting
pairing potential. To do so, we construct effective symmetry-constrained
low-energy Hamiltonians accounting for the real-space confinement. For a
nanoribbon geometry with finite width and length, we observe different phases
characterized by CMESs, MBSs, as well as coexisting CMESs and MBSs, as the
chemical potential, the magnetic doping and/or the width are varied.
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