Circular dichroism of chiral Majorana states

Osca, Javier; Serra, Llorenç
Beilstein Journal of Nanotechnology 9, 1194-1199 (2018)

Background: Majorana states in condensed matter devices may be of a localized nature, such as in hybrid semiconductor/supercon- ductor nanowires, or chirally propagating along the edges such as in hybrid 2D quantum-anomalous Hall/superconductor structures.
Results: We calculate the circular dichroism due to chiral Majorana states in a hybrid structure made of a quantum-anomalous Hall insulator and a superconductor. The optical absorption of chiral Majorana states is characterized by equally spaced absorption peaks of both positive and negative dichroism. In the limit of a very long structure (a 2D ribbon) peaks of a single sign are favored.
Conclusion: Circular-dichroism spectroscopy of chiral Majorana states is suggested as a relevant probe for these peculiar states of topological matter.

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