Electron-phonon coupling and exchange-correlation effects in superconductingH3Sunder high pressure

Strong Electron-Phonon Coupling in Yttrium under Pressure

Linear response methods are applied to identify the increase in electron-phonon coupling in elemental yttrium that is responsible for its high superconducting critical temperature Tc, which reaches nearly 20 K at 115 GPa. While the evolution of the band structure and density of states is smooth and seemingly modest, there is strong increase in the 4d content of the occupied conduction states un...

Strong pressure-dependent electron-phonon coupling in FeSe

Subhasish Mandal,1 R. E. Cohen,1,2 and K. Haule3 1Geophysical Laboratory, Carnegie Institution of Washington, Washington D.C. 20015, USA 2Department of Earth Sciences, University College London, Gower Street, WC1E 6BT London, United Kingdom 3Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA (Received 15 January 2014; revised manuscript received 20 May 2014; published ...

Tuning Correlation Effects with Electron–Phonon Interactions

Exchange and correlation effects on drag in low density electron bilayers: Coulombandvirtual-optical-phonon-mediated electron-electron interaction

We investigate the effect of exchange and correlation (xc) in low-density electron bilayers. Along with the direct Coulomb interaction, the effective electron-electron interaction mediated by the exchange of virtual polar optical (PO) phonons is considered. We find that the introduction of xc corrections results in a significant enhancement of the transresistivity and qualitative changes in its...

Phonon dispersion and electron-phonon coupling in MgB2 and AlB2.

We present a first principles investigation of the lattice dynamics and electron-phonon coupling of the superconductor MgB2 and the isostructural AlB2 within the framework of density functional perturbation theory using a mixed-basis pseudopotential method. Complete phonon dispersion curves and Eliashberg functions alpha2F are calculated for both systems. The main differences are related to hig...