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Superconducting pairing from repulsive interactions of fermions in a flat-band system
Iman Mahyaeh, Thomas Köhler, Annica M. Black-Schaffer +1
Fermion systems with flat bands can boost superconductivity by enhancing the density of states at the Fermi level. We use quasiexact numerical methods to show that repulsive intera…
Currents induced by magnetic impurities in superconductors with spin-orbit coupling
Sergey S. Pershoguba, Kristofer Björnson, Annica M. Black-Schaffer +1
We show that superconducting currents are generated around magnetic impurities and ferromagnetic islands proximity-coupled to superconductors with finite spin-orbit coupling. Using…
The importance of electron-electron interactions in the RKKY coupling in graphene
Annica M. Black-Schaffer
We show that the carrier-mediated exchange interaction, the so-called RKKY coupling, between two magnetic impurity moments in graphene is significantly modified in the presence of…
The possibility of measuring intrinsic electronic correlations in graphene using a d-wave contact Josephson junction
Annica M. Black-Schaffer, Sebastian Doniach
While not widely recognized, electronic correlations might play an important role in graphene. Indeed, Pauling's resonance valence bond (RVB) theory for the pp-bonded planar organi…