A SQUEEZED STATE APPROACH FOR THE LARGE POLARONS

ALTANHAN T., KANDEMİR B. S.

JOURNAL OF PHYSICS-CONDENSED MATTER, cilt.5, sa.36, ss.6729-6736, 1993 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 5 Sayı: 36
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1088/0953-8984/5/36/027
  • Dergi Adı: JOURNAL OF PHYSICS-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.6729-6736
  • Ankara Üniversitesi Adresli: Evet

Özet

The ground state energy of large polarons is investigated by means of squeezed states. First we introduced single-mode squeezed states and used the variational method to calculate this energy. This gives a result that is valid in the weak-coupling regime and only for very small values of the coupling constant. In order to improve the result we have considered two-mode squeezed states in which the correlation between phonons is involved. In this way the ground state energy is found to be lower than the Feynman result in the intermediate-coupling regime for alpha < 3.7.