Finite-size bosonization and self-consistent harmonic approximation
نویسندگان
چکیده
منابع مشابه
Finite-Size Bosonization and Self-Consistent Harmonic Approximation
The self-consistent harmonic approximation is extended in order to account for the existence of Klein factors in bosonized Hamiltonians. This is important for the study of finite systems where Klein factors cannot be ignored a priori. As a test we apply the method to interacting spinless fermions with modulated hopping. We calculate the finite-size corrections to the energy gap and the Drude we...
متن کاملsiparticle Self . Consistent GW Approximation
We present a new ab initio method for electronic structure calculations of materials at finite temperature (FT) based on the all-electron quasiparticle self-consistent GW (QPscGW) approximation and Keldysh time-loop Green's function approach. We apply the method to Si, Ge, GaAs, InSb, and diamond and show that the band gaps of these materials universally decrease with temperature in contrast wi...
متن کاملFinite temperature bosonization
Finite temperature properties of a non-Fermi liquid system is one of the most challenging probelms in current understanding of strongly correlated electron systems. The paradigmatic arena for studying non-Fermi liquids is in one dimension, where the concept of a Luttinger liquid has arisen. The existence of a critical point at zero temperature in one dimensional systems, and the fact that exper...
متن کاملWhen is a semiclassical approximation self-consistent?
A general condition for the self-consistency of a semiclassical approximation to a given system is suggested. It is based on the eigenvalue distribution of the relevant Hessian evaluated at the streamline configurations (configurations that almost satisfy the classical equations of motion). The semiclassical approximation is consistent when there exists a gap that separates small and large eige...
متن کاملLCAO method for finite-temperature systems and self-consistent perturbation scheme beyond the GW approximation
The linear combination of atomic orbitals (LCAO) method, which was originally developed for calculating the electronic structure of systems at zero temperature, is extended to treat finitetemperature systems. The new method yields an approximate free energy that is an upper bound to the true free energy of a real system. The approximate free energy is given in the space spanned by an LCAO basis...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2004
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/16/36/010