Document Type : Research

Authors

• Hamid-Reza Rastegar-Sedehi ¹
• Reza Khordad ²
• Afsaneh Bazrafshan ¹

¹ Department of Physics, Jahrom University, Jahrom, Iran

² Department of Physics, Yasouj University, Yasouj, Iran

Abstract

In this work, an electron which is strongly coupled to the LO-phonon in triangular quantum dots with Coulomb impurity is considered. First, the eigenenergies and eigenfunctions of the ground and the first-excited states of the electron are obtained using the Pekar variational method. We have studied entropy of the quantum dot qubit for different values of Coulomb impurity parameter, polaronic radius and electron-LO phonon coupling strength. Numerical analysis shows that the entropy has the oscillatory periodic evolution as function of the time due to the triangular form of the confinement. Also, the entropy increases with enhancing Coulomb parameter and polaronic radius.

Keywords

• Entropy
• Decoherence
• Impurity