The operator method is used to construct the solutions of the problem of the polaron in the strong coupling limit and of the helium atom on the basis of the Hartree–Fock equation. E0 = −0.108 512 8052α2 is obtained for the polaron ground-state energy. Energies for 2s and 3s states are also calculated. The other excited states are briefly discussed.

The field-effect mobility of hole polarons in α-sexithiophene, measured in thin film transistors, was shown to be well fitted by Holstein’s small polaron theory. Unfortunately, Holstein’s formulation is based on an integral that does not converge. We show that the data are well fitted by a theory of polaron transport that was successful in accounting for mobility in molecular crystals

Electron-lattice interactions are often considered not to play a major role in material’s properties as they are assumed to be small, the second-order effects. This study, however, shows the importance of taking these effects into account in the simulations. My results demonstrate the impact of the electron-lattice interaction on the physics of the material and our understanding from it. One wa...

We investigate the nonequilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou et al., Nat. Phys. (2021)]. The is tracked down by using time-dependent variational coherent ansatz. For weak coupling between and bath, analytical expressions for contrast are derived, matching quite well previous findings obtaine...

Quantum optics with giant emitters has shown a new route for the observation and manipulation of non-Markovian properties in waveguide QED. In this paper we extend theory atoms, hitherto restricted to perturbative light-matter regime, deal ultrastrong-coupling regime. Using static dynamical polaron methods, address low-energy subspace atom coupled an Ohmic beyond standard rotating-wave approxim...

Quantum Monte Carlo techniques are employed to study the properties of polarons in an ultracold Fermi gas, at $T=0$, and unitary regime using both a zero-range model square-well potential. For fixed density, potential range is varied results extrapolated compared against model. A discussion regarding choice interacting with finite presented. We compute polaron effective mass, binding energy, co...