Abstract

Graphene nanoribbons support a variety of electronic phases that can be tuned via external stimuli. In particular, zigzag graphene nanoribbons exhibit an antiferromagnetic insulating ground state which can transition to a half-metallic phase under a transverse electric field or when embedded in hexagonal boron nitride. Here, we develop a simple model of a heterostructure composed of a half-metallic zigzag graphene nanoribbon coupled with an Ising superconductor. We demonstrate that the Ising superconductor with a parent s-wave spin-singlet pairing can induce an unexpected spin-triplet, odd-parity pairing in the half-metallic phase of the nanoribbon. The resulting superconducting phase is topologically nontrivial, with gate-tunable transitions that enable the emergence of Majorana zero modes.

Abstract

Graphene nanoribbons support a variety of electronic phases that can be tuned via external stimuli. In particular, zigzag graphene nanoribbons exhibit an antiferromagnetic insulating ground state which can transition to a half-metallic phase under a transverse electric field or when embedded in hexagonal boron nitride. Here, we develop a simple model of a heterostructure composed of a half-metallic zigzag graphene nanoribbon coupled with an Ising superconductor. We demonstrate that the Ising superconductor with a parent s-wave spin-singlet pairing can induce an unexpected spin-triplet, odd-parity pairing in the half-metallic phase of the nanoribbon. The resulting superconducting phase is topologically nontrivial, with gate-tunable transitions that enable the emergence of Majorana zero modes.

Abstract

Graphene nanoribbons support a variety of electronic phases that can be tuned via external stimuli. In particular, zigzag graphene nanoribbons exhibit an antiferromagnetic insulating ground state which can transition to a half-metallic phase under a transverse electric field or when embedded in hexagonal boron nitride. Here, we develop a simple model of a heterostructure composed of a half-metallic zigzag graphene nanoribbon coupled with an Ising superconductor. We demonstrate that the Ising superconductor with a parent s-wave spin-singlet pairing can induce an unexpected spin-triplet, odd-parity pairing in the half-metallic phase of the nanoribbon. The resulting superconducting phase is topologically nontrivial, with gate-tunable transitions that enable the emergence of Majorana zero modes.

Abstract

Graphene nanoribbons support a variety of electronic phases that can be tuned via external stimuli. In particular, zigzag graphene nanoribbons exhibit an antiferromagnetic insulating ground state which can transition to a half-metallic phase under a transverse electric field or when embedded in hexagonal boron nitride. Here, we develop a simple model of a heterostructure composed of a half-metallic zigzag graphene nanoribbon coupled with an Ising superconductor. We demonstrate that the Ising superconductor with a parent s-wave spin-singlet pairing can induce an unexpected spin-triplet, odd-parity pairing in the half-metallic phase of the nanoribbon. The resulting superconducting phase is topologically nontrivial, with gate-tunable transitions that enable the emergence of Majorana zero modes.