Counting Majorana zero modes in superconductors
Luiz Santos, Yusuke Nishida, Claudio Chamon, Christopher Mudry
DOI 10.1103/PhysRevB.83.104522 · Physical Review B
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Abstract
A counting formula for computing the number of (Majorana) zero modes bound to topological point defects is evaluated in a gradient expansion for systems with charge-conjugation symmetry. This semi-classical counting of zero modes is applied to some examples that include graphene and a chiral p-wave superconductor in two-dimensional space. In all cases, we explicitly relate the counting of zero modes to Chern numbers.
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