Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions

Motohiko Ezawa

doi:10.1103/PhysRevLett.114.056403

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Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions

Motohiko Ezawa

DOI 10.1103/PhysRevLett.114.056403 · Physical Review Letters

T1

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Abstract

We investigate the realization of a topological superconductor in a generic bucked honeycomb system equipped with four types of mass-generating terms, where the superconductor gap is introduced by attaching the honeycomb system to an s-wave superconductor. Constructing the topological phase diagram, we show that Majorana modes are formed in the phase boundary. In particular, we analyze the honeycomb system with antiferromagnetic order in the presence of perpendicular electric field Ez. It becomes topological for |Ez|>Ezcr and trivial for |Ez|<Ezcr, with Ezcr a certain critical field. It is possible to create a topological spot in a trivial superconductor by controlling applied electric field. One Majorana zero-energy bound state appears at the phase boundary. We can arbitrarily control the position of the Majorana fermion by moving the spot of applied electric field, which will be made possible by a scanning tunneling microscope probe.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaCrAgO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown