LDA+DMFTspectral functions and effective electron mass enhancement in the superconductor LaFePO

Electron-Phonon Mass Enhancement in Multi-Layers

A strong electron-phonon interaction in a metal increases the electron density of states in the vicinity of the Fermi energy dramatically. This phenomenon is called electron-phonon mass enhancement. In this paper the question is investigated whether the mass enhancement can be manipulated in multi-layers of two metals with strong and weak electron-phonon interaction. A rich behavior is observed...

Effective mass effect in attosecond electron transport

LAMIA KASMI,* MATTEO LUCCHINI, LUCA CASTIGLIONI, PAVEL KLIUIEV, JÜRG OSTERWALDER, MATTHIAS HENGSBERGER, LUKAS GALLMANN, PETER KRÜGER, AND URSULA KELLER Department of Physics, ETH Zurich, 8093 Zürich, Switzerland Department of Physics, University of Zurich, 8057 Zürich, Switzerland Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland Graduate School of Science and Engineering...

Many-body Effective Mass Enhancement in a Two-dimensional Electron Liquid

Electron-phonon interaction and charge carrier mass enhancement in SrTiO3.

We report a comprehensive THz, infrared and optical study of Nb-doped SrTiO3 as well as dc conductivity and Hall effect measurements. Our THz spectra at 7 K show the presence of an unusually narrow (<2 meV) Drude peak. For all carrier concentrations the Drude spectral weight shows a factor of three mass enhancement relative to the effective mass in the local density approximation, whereas the s...

The effective electron mass in core-collapse supernovae

Finite temperature field theory is used to calculate the correction to the mass of the electron in plasma with finite temperature and arbitrary chemical potential, and the results are applied to the core regions of type II supernovae (SNe). It is shown that the effective electron mass varies between 1 MeV at the edge of the SN core up to 11 MeV near the center. This changed electron mass affect...