Friday, March 29, 2013

1303.6956 (Andrew C. Potter et al.)

Edge-Ferromagnetism from Majorana Flat-Bands: Application to Split
Tunneling-Conductance Peaks in the High-Tc Cuprates
   [PDF]

Andrew C. Potter, Patrick A. Lee
In mean-field descriptions of nodal d-wave superconductors, generic edges exhibit dispersionless Majorana fermion bands at zero-energy. These states give rise to an extensive ground-state degeneracy, and are protected by time-reversal (TR) symmetry. We argue that the infinite density of states of these flat-bands make them inherently unstable to interactions, and show that repulsive interactions lead to edge FM which splits the flat bands. This edge FM offers an explanation for the observation of splitting of zero-bias peaks in edge tunneling in High-Tc cuprate superconductors. We argue that this mechanism for splitting is more likely than previously proposed scenarios, and describe its experimental consequences.
View original: http://arxiv.org/abs/1303.6956

No comments:

Post a Comment