TY - JOUR T1 - Two-dimensional free massless Fermi theory at finite chemical potential in the Thermo-field Dynamics approach TT - بررسی فرمیون دو بعدی بدون جرم در پتانسیل شیمیایی محدود به روش دینامیکی ترموفیلد JF - opsi JO - opsi VL - 21 IS - 0 UR - http://opsi.ir/article-1-515-en.html Y1 - 2015 SP - 321 EP - 324 KW - Chemical potential KW - Fermions KW - Thermo-field KW - Two-point function N2 - - 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 . M3 ER -