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Dirac cone in iron-based high Tc superconductors
M. Zahid Hasan, B. Andrei Bernevig
The band structure of iron-based superconductors gives rise to yet another scenario for the appearance of Dirac fermions. A viewpoint on "Observation of Dirac cone electronic dispe…
Experimental Consequences of the S-wave Superconductivity in the Iron-Pnictides
Meera M. Parish, Jiangping Hu, B. Andrei Bernevig
The experimental consequences of different order parameters in iron-based superconductors are theoretically analyzed. We consider both nodeless and nodal order parameters, with an…
Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
Kangjun Seo, B. Andrei Bernevig, Jiangping Hu
We study the pairing symmetry of a two orbital model for FeAs layers in oxypnictides. We vary the doping and the value of and to compare all possible pairing…
On Vortices and Phase Coherence in High Tc Superconductors
Bogdan A. Bernevig, Zaira Nazario, David I. Santiago
We show that an array of Josephson coupled Cooper paired planes can never have long range phase coherence at any finite temperature due to an infrared divergence of phase fluctuati…
Magnetic Instability in Strongly Correlated Superconductors
Bogdan A. Bernevig, Robert B. Laughlin, David I. Santiago
Recently a new phenomenological Hamiltonian has been proposed to describe the superconducting cuprates. This so-called Gossamer Hamiltonian is an apt model for a superconductor wit…
Spectroscopy of Matter Near Criticality
B. A. Bernevig, D. Giuliano, R. B. Laughlin
We propose that the finite-frequency susceptibility of matter near a class of zero-temperature phase transition exhibits distinctive excitonic structure similar to meson resonances…