Zobrazeno 1 - 10
of 525
pro vyhledávání: '"Devreese, J."'
Optical conductivity of an interacting polaron gas is calculated within an extended random phase approximation which takes into account mixing of collective excitations of the electron gas with LO phonons. This mixing is important for the optical res
Externí odkaz:
http://arxiv.org/abs/1912.03062
Publikováno v:
Journal of Superconductivity and Novel Magnetism 32, 2739-2744 (2019)
The dielectric function method for superconductivity has been applied to SrTiO$_{3}$ accounting for the non-parabolic dispersion of charge carriers in the conduction band and for the dispersion of optical phonons based on density functional theory ca
Externí odkaz:
http://arxiv.org/abs/1811.11656
Publikováno v:
Phys. Rev. B 97, 134305 (2018)
We present results for the solution of the large polaron Fr\"ohlich Hamiltonian in 3-dimensions (3D) and 2-dimensions (2D) obtained via the Diagrammatic Monte Carlo (DMC) method. Our implementation is based on the approach by Mishchenko [A.S. Mishche
Externí odkaz:
http://arxiv.org/abs/1803.09608
Autor:
Devreese, J. T.
In the present course, an overview is presented of the fundamentals of continuum-polaron physics, which provide the basis of the analysis of polaron effects in ionic crystals and polar semiconductors. These Lecture Notes deal with "large", or "contin
Externí odkaz:
http://arxiv.org/abs/1611.06122
In strontium titanate, the Froehlich electron - LO-phonon interaction dominates the electron response and can also provide superconductivity. Because of high LO-phonon frequencies in SrTiO3, the superconducting system is non-adiabatic. We demonstrate
Externí odkaz:
http://arxiv.org/abs/1606.00644
Publikováno v:
Phys. Rev. B 94, 125206 (2016)
In the present work, the problem of an all-coupling analytic description for the optical conductivity of the Froehlich polaron is treated, with the goal being to bridge the gap in validity range that exists between two complementary methods: on the o
Externí odkaz:
http://arxiv.org/abs/1606.00605
Publikováno v:
Physica C 503 (2014), 136
In the context of superfluid Fermi gases, the Ginzburg - Landau (GL) formalism for the macroscopic wave function has been successfully extended to the whole temperature range where the superfluid state exists. After reviewing the formalism, we first
Externí odkaz:
http://arxiv.org/abs/1508.04693
Publikováno v:
Phys. Rev. A 90, 053613 (2014)
We use a finite temperature effective field theory recently developed for superfluid Fermi gases to investigate the properties of dark solitons in these superfluids. Our approach provides an analytic solution for the dip in the order parameter and th
Externí odkaz:
http://arxiv.org/abs/1407.3107