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

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

While simple gains of polarons have been good well-known decades in the past and feature been defined in a couple of assessment papers and textbooks, curiosity within the function of electron-phonon interactions and polaron dynamics in modern fabrics has lately passed through a lively revival. Electron-phonon interactions were proven to be correct in high-temperature superconductors and substantial magnetoresistance oxides, and shipping via nanowires and quantum dots additionally usually depends upon vibronic displacements of ions. the continuing curiosity in polarons extends past actual description of complicated fabrics. the sphere has been a trying out flooring for analytical, semi-analytical, and numerical strategies, equivalent to course integrals, strong-coupling perturbation growth, complicated variational, unique diagonalization, density-matrix renormalization staff, dynamic mean-field, and quantum Monte Carlo options. unmarried and multi-polaron theories have provided a brand new perception in our realizing of high-temperature superconductivity, monstrous magnetoresistance, and the correlated delivery via molecular quantum dots. This publication studies a few fresh advancements within the box of polarons, beginning with the fundamentals and overlaying a couple of energetic instructions of study.

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96) q,q ˆq (t) = [Vq dq (t) + V ∗ d† (t)]eiq·r(t) , and |Ψ0 is the groundwhere δ = +0, B −q −q state wave function of the electron–phonon system. 97) where Θ(x) = 1 if x > 0 and zero otherwise. 97) is represented in Fig. 6. 98) where v is the dielectric permittivity of the vacuum, and n is the refractive index of the medium. 98). 98) reflects the fact that at zero temperature, the absorption of light accompanied by the emission of a phonon can occur only if the energy of the incident photon is larger than that of a phonon (Ω > ω0 ).

Upper panel : the polaron free energy in 2D (squares) and 3D (open circles) obtained by TPC’2001 [65] for β = 10. The data for F3D (α) are interpolated using a polynomial fit to the available four points (dotted line). Lower panel : demonstration of the PD-scaling (cf. PD’1987). The polaron free energy in 2D obtained by TPC’2001 [65] for β = 10 (squares). The PD-scaled according to PD’1987 [121] polaron free energy in 3D from TPC’2001 for β = 10 (open triangles). The data for (2/3)F3D (3πα/4) are interpolated using a polynomial fit to the available four points (solid line) (reprinted with permission from [94].

20) The corresponding eigenvalues E± are E± = ω0 /2 − Ep ± t˜.

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