Ground state and optical conductivity of interacting polarons in a quantum dot

Klimin Serghei; Fomin Vladimir; Brosens Fons; Devreese Josef T.

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KLIMIN, Serghei, FOMIN, Vladimir, BROSENS, Fons, DEVREESE, Josef T.. Ground state and optical conductivity of interacting polarons in a quantum dot. In: Physical Review B - Condensed Matter and Materials Physics, 2004, vol. 69, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.69.235324

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Physical Review B - Condensed Matter and Materials Physics

Volumul 69 / 2004 / ISSN 1098-0121 /ISSNe 1550-235X

Ground state and optical conductivity of interacting polarons in a quantum dot

DOI:https://doi.org/10.1103/PhysRevB.69.235324

Pag. 0-0

Klimin Serghei¹, Fomin Vladimir²¹, Brosens Fons³, Devreese Josef T.²

¹ Moldova State University,
² Eindhoven University of Technology,
³ University of Antwerp

Disponibil în IBN: 30 iunie 2023

Rezumat

The ground-state energy, addition energies, and optical absorption spectra are derived for interacting polarons in parabolic quantum dots in three and two dimensions. A path integral formalism for identical particles is used in order to take into account the fermion statistics. The approach is applied to both closed-shell and open-shell systems of interacting polarons. Using a generalization of the Jensen-Feynman variational principle, the ground-state energy of a confined N-polaron system is analyzed as a function of N and of the electron-phonon coupling constant α. In contrast to few-electron systems without the electron-phonon interaction, three types of spin polarization are possible for the ground state of the few-polaron systems: (i) a spin-polarized state, (ii) a state where the spin is determined by Hund's rule, and (iii) a state with the minimal possible spin. A transition from a state fulfilling Hund's rule to a spin-polarized state occurs when the electron density is decreased. In the strong-coupling limit, the system of interacting polarons turns into a state with the minimal possible spin. These transitions should be experimentally observable in the optical absorption spectra of quantum dots.

Cuvinte-cheie
absorption spectrophotometry, acceleration, article, Electric conductivity, energy, molecular interaction, optics, particle size, phonon, polarization, quantum mechanics, Spectrometry, statistical analysis, Vibration

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