Transition metal oxides host a wealth of exotic phenomena ranging from charge, orbital and magnetic order to nontrivial topological phases and superconductivity. In order to translate these unique materials properties into device functionalities these materials must be doped; however, the nature of carriers and their conduction mechanism at the atomic scale remain unclear. Recent angle-resolved...

A model of particle interacting with quantum field is considered. The model includes as particular cases the polaron model and non-relativistic quantum elec-trodynamics. We show that the field operators obey q-commutation relations with q depending on time. After the stochastic (or van Hove) limit, due to the nonlin-earity, the atomic and field degrees of freedom become entangled in the sense t...

A model of particle interacting with quantum field is considered. The model includes as particular cases the polaron model and non-relativistic quantum electrodynamics. We show that the field operators obey q-commutation relations with q depending on time. After the stochastic (or van Hove) limit, due to the nonlinearity, the atomic and field degrees of freedom become entangled in the sense tha...

The Fröhlich model describes the interaction of a mobile impurity with a surrounding bath of phonons which leads to the formation of a quasiparticle, the polaron. In this paper an efficient renormalization group approach is presented which provides a description of Fröhlich polarons in all regimes ranging from weak to strong coupling. The extended renormalization group approach introduced here ...

We present accurate results for optical conductivity of the three dimensional Fröhlich polaron in all coupling regimes. The systematic-error free diagrammatic quantum Monte Carlo method is employed where the Feynman graphs for the momentum-momentum correlation function in imaginary time are summed up. The real-frequency optical conductivity is obtained by the analytic continuation with stochast...

*Correspondence: [email protected] 1JARA Institut für Quanteninformation, RWTH, Otto-Blumenthalstraße 20, Aachen, 52074, Germany Full list of author information is available at the end of the article Abstract We derive a family of stochastic master equations describing homodyne measurement of multi-qubit diagonal observables in circuit quantum electrodynamics. In the regime where qub...

A field-effect transistor ~FET! with a channel length of ;100 nm was constructed from a small number of individual V2O5 fibers of the cross section 1.5 nm310 nm. At low temperature, the conductance increases as the gate voltage is changed from negative to positive values, characteristic of a FET with n-type enhancement mode. The carrier mobility, estimated from the low-field regime, is found to...

Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems was available even in the framework of simple models such as the one-dimensional spinless Holstein model considered here. In this work, previous results obtained using numerical as well as analytical approaches are review...

Exciton-polaron formation in one-dimensional lattice models with shortor long-range carrier-phonon interaction is studied by quantum Monte Carlo simulations. Depending on the relative sign of electron and hole-phonon coupling, the exciton-polaron size increases or decreases with increasing interaction strength. Quantum phonon fluctuations determine the excitonpolaron size and yield translation-...

ABSTRACT: Correlation of squeezing and displacement variational parameters of phonons is shown to enhance the e ective electron-phonon coupling constant when compared with the uncorrelated case. The correlation supresses all quantum e ects of phonons: the quantum reduction of the polaron sel ocalization, of the Debye-Waller factor and of the increase of the soliton (quantum Holstein polaron) wi...