We investigated temperature dependent optical conductivity spectra of La7/8Sr1/8MnO3. Its phonon bending mode starts to be splitted near a structural phase transition temperature. With further cooling, strength of a midinfrared small polaron peak, which is located at 0.4 eV, becomes increased. These temperature dependent changes in the phonon spectra and the polaron absorption peaks were explai...

We investigate the properties of a dilute gas impurities embedded in an ultracold bosons that forms Bose–Einstein condensate (BEC). This work focuses mainly on equation state (EoS) impurity at zero temperature and induced interaction between mediated by host bath. use perturbative field-theory approaches, such as Hugenholtz–Pines formalism, weakly interacting regime. In turn, for strong interac...

We present computational evidence of polaronic hole trapping and migration in lithium peroxide (Li2O2), a material of interest in lithium-air batteries. We find that the hole forms in the π∗ antibonding molecular orbitals of the peroxide (O2− 2 ) anion, and that this trapped hole induces significant local lattice distortion, forming a polaron. Our study finds migration barriers for the free pol...

Based on the statistical dynamical mean field theory, we investigate, in a generic model for a strongly coupled disordered electron-phonon system, the competition between polaron formation and Anderson localization. The statistical dynamical mean field approximation maps the lattice problem to an ensemble of self-consistently embedded impurity problems. It is a probabilistic approach, focusing ...

We consider the polaron model of the relativistic quantum electrodynamics with a fixed total momentum. We analyze some properties of the ground state energy of the model, and show that the polaron model has a ground state under a condition which includes conditions for an infrared and an ultraviolet cutoff for photon momenta. In particular, we show that the model with zero total momentum, a non...

Taking the same trial wave function, the ground-state energy of Fröhlich polaron is investigated by variational method and coherent-state expansion (CSE) one, respectively. Within the accuracy to α2(the electron-phonon coupling constant), both methods can give the same analytic expressions of polaron groundstate energy as the function of electron-phonon coupling constant. We find that the CSE m...