TY - JOUR
T1 - A new analysis of optical excitations in the Hubbard model
AU - Mancini, F.
AU - Perkins, N.
AU - Villani, D.
PY - 1999
Y1 - 1999
N2 - A new theoretical analysis of the conductivity tensor is developed by use of the composite operator method for the two-dimensional Hubbard model. With the aid of the Ward-Takahashi identities which phrase the charge conservation law, the calculation of the current-current propagator is reduced hierarchically to the current-charge and charge-charge ones. Besides, the fermionic character of the propagating charges is preserved because of a constraining equation with the content of the Pauli principle which uniquely fixes the single-particle dynamics.
AB - A new theoretical analysis of the conductivity tensor is developed by use of the composite operator method for the two-dimensional Hubbard model. With the aid of the Ward-Takahashi identities which phrase the charge conservation law, the calculation of the current-current propagator is reduced hierarchically to the current-charge and charge-charge ones. Besides, the fermionic character of the propagating charges is preserved because of a constraining equation with the content of the Pauli principle which uniquely fixes the single-particle dynamics.
KW - 2D Hubbard model
KW - Composite operator method
KW - Optical conductivity
KW - Ward-Takahashi identity
UR - http://www.scopus.com/inward/record.url?scp=9344241809&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=9344241809&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(98)00869-2
DO - 10.1016/S0921-4526(98)00869-2
M3 - Article
AN - SCOPUS:9344241809
SN - 0921-4526
VL - 259-261
SP - 755
EP - 756
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -