RT - Journal Article T1 - Two-dimensional free massless Fermi theory at finite chemical potential in the Thermo-field Dynamics approach JF - opsi YR - 2015 JO - opsi VO - 21 IS - 0 UR - http://opsi.ir/article-1-515-en.html SP - 321 EP - 324 K1 - Chemical potential K1 - Fermions K1 - Thermo-field K1 - Two-point function AB - - A free massless fermion field at finite chemical potential and time varying temperature are considered and in thermo-field dynamics the expectation value of 2n-point functions as the thermodynamic average are computed. It was observed that the Fermi fields under consideration, was able to factorize the chemical potential dependence of the two-point functions in to an exponential pre-factor . LA eng UL http://opsi.ir/article-1-515-en.html M3 ER -