Spectral function of the Holstein polaron at finite temperature

Phonon spectral function of the Holstein polaron

The phonon spectral function of the one-dimensional Holstein model is obtained within weak and strong-coupling approximations based on analytical self-energy calculations. The characteristic excitations found in the limit of small charge-carrier density are related to the known (electronic) spectral properties of Holstein polarons such as the polaron band dispersion. Particular emphasis is laid...

The Holstein Polaron

We describe a variational method to solve the Holstein model for an electron coupled to dynamical, quantum phonons on an infinite lattice. The variational space can be systematically expanded to achieve high accuracy with modest computational resources (12-digit accuracy for the 1d polaron energy at intermediate coupling). We compute ground and low-lying excited state properties of the model at...

Spectral function at high temperature ∗

For the calculation of static quantities, such as free energies, phase diagrams and screening masses, the euclidean lattice formulation of finitetemperature quantum fields offers a first-principle approach. For intrinsically real-time correlators, such as the spectral function, no first-principle nonperturbative formulation exists. In the last O(10) years the classical approximation at high tem...

Mesons Spectral Functions at Finite Temperature

We investigate the thermal spectral densities for (pseudo)scalar and vector currents in the framework of the real time formalism when mass of two quarks are different. Such spectral densities are necessary for the phenomenological investigation of in-medium properties of hadrons. We use the quark propagator at finite temperature and calculate annihilation and scattering parts of spectral densit...

Numerical solution of the Holstein polaron problem