Effects of a scattering center on the ground-state energy of quantum-dot lithium

Vatansever Z., Sakiroglu S., Sokmen I.

MODERN PHYSICS LETTERS B, cilt.31, sa.7, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 7
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1142/s0217984917500713
  • Dergi Adı: MODERN PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Quantum dot, scattering center, CI method, WIGNER MOLECULES, IMPURITY, SPECTRA
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this paper, the effects of a repulsive scattering center on the ground-state energy and spin properties of a three-electron parabolic quantum dot are investigated theoretically by means of configuration interaction method. Phase transition from a weakly correlated regime to a strongly correlated regime is examined from several strengths and positions of Gaussian impurity. Numerical results reveal that the transition from spin-1/2 to spin-3/2 state depends strongly on the location of the impurity which accordingly states the controllability of the spin polarization. Moreover, broken circular symmetry results in more pronounced electronic charge localization.