The Field Theoretical Treatment of the Charged-Boson and –Fermion System : Ground State Energy and Elementary Excitations
Year: 1973
Type: article
Abstract: The neutral system consisting of charged-bosons and -fermions has been investigated in terms of density parameter expansion at the high-density limit. The ground state energy of this system is calculated and accords with the result obtained in our previous work. The elementary excitations in the system determined from the poles of the boson Green's function are the two collective excitations in the low momentum region : acoustic- and optical-phonon like. The life-time of the acoustic phonon approaches infinite as s/v_f →0 where s and v_f arc the sound velocity and Fermi velocity, respectively, while that of the optical pbonon is infinite.
Authors: Mitsuaki Ginoza, Hideo Kanazawa, 光昭 宜野座, 秀夫 金沢
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W412956401