33 research outputs found
Theory of Multiband Superconductivity in Iron Pnictides
The precise nature of unconventional superconductivity in Iron Pnictides is
presently a hotly debated issue. Here, using insights from normal state
electronic structure and symmetry arguments, we show how an unconventional SC
emerges from the bad metal "normal" state. Short-ranged, multi-band spin- and
charge correlations generates nodeless SC in the active planar
bands, and an inter-band proximity effect induces out-of-plane gap nodes in the
passive band. While very good quantitative agreement with
various key observations in the SC state and reconciliation with NMR and
penetration depth data in the same picture are particularly attractive features
of our proposal, clinching evidence would be an experimental confirmation of
c-axis nodes in future work.Comment: 4 pages, 2 eps figures, submitted to PRL, text modifie
Magnetoresistance in the spin-orbit kondo state of elemental bismuth
Materials with strong spin-orbit coupling, which competes with other particle-particle interactions and external perturbations, offer a promising route to explore novel phases of quantum matter. Using LDA + DMFT we reveal the complex interplay between local, multi-orbital Coulomb and spin-orbit interaction in elemental bismuth. Our theory quantifies the role played by collective dynamical fluctuations in the spin-orbit Kondo state. The correlated electronic structure we derive is promising in the sense that it leads to results that might explain why moderate magnetic fields can generate Dirac valleys and directional-selective magnetoresistance responses within spin-orbit Kondo metals
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All-t2g electronic orbital reconstruction of monoclinic MoO2 battery material
Motivated by experiments, we undertake an investigation of electronic structure reconstruction and its link to electrodynamic responses of monoclinic MoO2. Using a combination of LDA band structure with DMFT for the subspace defined by the physically most relevant Mo 4d-bands, we unearth the importance of multi-orbital electron interactions to MoO2 parent compound. Supported by a microscopic description of quantum capacity we identify the implications of many-particle orbital reconstruction to understanding and evaluating voltage-capacity profiles intrinsic to MoO2 battery material. Therein, we underline the importance of the dielectric function and optical conductivity in the characterisation of existing and candidate battery materials