Read e-book online Advances in Polaron Physics PDF

By Alexandre S. Alexandrov, Jozef T. Devreese (auth.)

ISBN-10: 3642018955

ISBN-13: 9783642018954

ISBN-10: 3642018963

ISBN-13: 9783642018961

While easy gains of polarons have been good well-known many years in the past and feature been defined in a couple of overview papers and textbooks, curiosity within the position of electron-phonon interactions and polaron dynamics in modern fabrics has lately passed through a full of life revival. Electron-phonon interactions were proven to be appropriate in high-temperature superconductors and immense magnetoresistance oxides, and delivery via nanowires and quantum dots additionally usually will depend on vibronic displacements of ions. the continuing curiosity in polarons extends past actual description of complex fabrics. the sphere has been a checking out floor for analytical, semi-analytical, and numerical recommendations, equivalent to course integrals, strong-coupling perturbation enlargement, complicated variational, distinctive diagonalization, density-matrix renormalization workforce, dynamic mean-field, and quantum Monte Carlo strategies. unmarried and multi-polaron theories have provided a brand new perception in our knowing of high-temperature superconductivity, sizeable magnetoresistance, and the correlated shipping via molecular quantum dots. This booklet experiences a few fresh advancements within the box of polarons, beginning with the fundamentals and masking a couple of lively instructions of study.

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Extra resources for Advances in Polaron Physics

Sample text

93) and experiment is that in the pathintegral approximation to the polaron mobility, a Maxwellian distribution for the electron velocities is assumed, when applying the adiabatic switching of the Fr¨ ohlich interaction. ) cause a Gaussian distribution. 2 Optical Absorption at Weak Coupling At zero temperature and in the weak-coupling limit, the optical absorption of a Fr¨ohlich polaron is due to the elementary polaron scattering process with the absorption of incoming photon and emission of an outgoing phonon.

In FHIP, for weak electron–phonon coupling, one takes limΩ→0 limα→0 , whereas limα→0 limΩ→0 should be calculated. It turns out that for the asymptotically correct result, the mobility at low temperatures is mainly limited by the absorption of phonons, while in the theory of FHIP it is the emission of phonons which gives the dominant contribution as T goes to zero [85]. The analysis based on the Boltzmann equation takes into account the phonon emission processes whenever the energy of the polaron is above the emission threshold.

A comparison of the DSG results with the optical conductivity spectra given by recently developed “approximation-free” numerical [100] and approximate analytical [67, 101] approaches was carried out recently [101], see also the review articles [58, 66]. The polaron absorption coefficient Γ(Ω) of light with frequency Ω at arbitrary coupling was first derived in [73]. It was represented in the form Γ(Ω) = − 1 e2 Im Σ(Ω) . 99) This general expression was the starting point for a derivation of the theoretical optical absorption spectrum of a single Fr¨ ohlich polaron at all electron– phonon coupling strengths by Devreese et al.

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Advances in Polaron Physics by Alexandre S. Alexandrov, Jozef T. Devreese (auth.)


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