Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons

Dezider KULAK

Makale detayları

Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons

Yazarlar:

Dezider KULAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2007 Vol.31 Issue 5, pp.235-252

Belge Tipi:

Makale

Yayın Tarihi:

4/2007

Belge Dili:

Türkçe

Document ID (Org No.):

2000761085

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

In this paper a variational study of a tunnelling exciton  (Frenkel exciton) coupled to an arbitrary number of phonon modes is  presented.  The results of our model are presented both for weak  non-adiabatic cases and for strong cases; and we come to the  conclusion that the tunnelling reduction factor, the ground state  energy of the tunnelling exciton-phonons system, and the mean number  of ground state phonons, as the functions of the exciton-phonons  coupling strength, are continuous, a condition that does not apply in  cases of the tunnelling exciton-phonons models presented in the  previous studies.  In comparison with the previous studies, the  presented model leads to a significant decrease of the ground state  energy both of the small polaron and of the tunnelling exciton-phonons  system, mainly for weak non-adiabatic cases.

 

In this paper a variational study of a tunnelling exciton  (Frenkel exciton) coupled to an arbitrary number of phonon modes is  presented.  The results of our model are presented both for weak  non-adiabatic cases and for strong cases; and we come to the  conclusion that the tunnelling reduction factor, the ground state  energy of the tunnelling exciton-phonons system, and the mean number  of ground state phonons, as the functions of the exciton-phonons  coupling strength, are continuous, a condition that does not apply in  cases of the tunnelling exciton-phonons models presented in the  previous studies.  In comparison with the previous studies, the  presented model leads to a significant decrease of the ground state  energy both of the small polaron and of the tunnelling exciton-phonons  system, mainly for weak non-adiabatic cases.

Makale detayları

Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons

Yazarlar:

Dezider KULAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2007 Vol.31 Issue 5, pp.235-252

Belge Tipi:

Makale

Yayın Tarihi:

4/2007

Belge Dili:

Türkçe

Document ID (Org No.):

2000761085

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Hamiltonian

Ground state approximation

Vacuum state

Sayı

Makale detayları

Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons

Yazarlar: Dezider KULAK

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2007 Vol.31 Issue 5, pp.235-252

Belge Tipi: Makale

Yayın Tarihi: 4/2007

Belge Dili: Türkçe

Document ID (Org No.): 2000761085

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Hamiltonian

Ground state approximation

Vacuum state

Sayı

Yazarlar:

Dezider KULAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2007 Vol.31 Issue 5, pp.235-252

Belge Tipi:

Makale

Yayın Tarihi:

4/2007

Belge Dili:

Türkçe

Document ID (Org No.):

2000761085

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101