Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 755-756 |
| Number of pages | 2 |
| Journal | Physica B: Condensed Matter |
| Volume | 259-261 |
| DOIs | |
| State | Published - 1999 |
Keywords
- 2D Hubbard model
- Composite operator method
- Optical conductivity
- Ward-Takahashi identity
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