10-13U

# 10-13U

By - Posted on 08 February 2012

UDC:
538.911, 538.931, 538.941
PACS:
05.30.Jp, 05.60.Gg, 66.10.Ed

The diagrammatic series for correlators of hard-core boson model

O.O. Menchyshyn

We consider a hard-core boson model and obtain an analytical expression for conductivity. The pseudo-spin representation is used which allows one to take into account the effect of hard-core of particles upon their scattering processes. The diagrammatic series is constructed for the "current-current" correlation functions in normal phase at low temperature. We show how to sum up the main classes of diagrams in approximation of calculating up to one sum over $\mathbf{q}$. Method can be extended to whole temperature interval and does not depend on concentration of particles.

Year:
2010
Pages:
28