Polaronic effects in one-dimensional quantum antidot arrays
EUROPEAN PHYSICAL JOURNAL B, cilt.66, sa.1, ss.51-55, 2008 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 66 Sayı: 1
- Basım Tarihi: 2008
- Doi Numarası: 10.1140/epjb/e2008-00395-2
- Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.51-55
- Ankara Üniversitesi Adresli: Evet
Özet
We study the effect of polaronic corrections arising from the electron-longitudinal optical phonon interaction on the energy spectrum of a two-dimensional electron system with a one-dimensional periodic antidot array geometry created by a weak electrostatic modulation potential, and subjected to a weak magnetic field modulation as well as a uniform strong perpendicular static magnetic field. To incorporate the effects of electron-phonon interactions within the framework of Frohlich polaron theory, we first apply a displaced-oscillator type unitary transformation to diagonalise the relevant Frohlich Hamiltonian, and we then determine the parameters of this transformation together with the parameter included in the electronic trial wave function . On the basis of this technique, it has been shown that the polaronic corrections have non-negligible effects on the electronic spectrum of a two-dimensional electron system with a quantum antidot array, since switching such an interaction results in shifting the degeneracy restoring points of Landau levels wherein the flatband condition is fulfilled, thus suppressing the Weiss oscillations.