Abstract
The contribution to the pair-distribution function from two types of quantum graph is investigated. These graphs have the exchange and collective characters, and are important in the elimination of a divergence and also in the evaluation of the effective mass. A microscopic justification of Landau-type approach with elementary excitations is given. The excitation spectrum and the structure factor are evaluated for a soft potential with a Lennard-Jones-type tail. With the potential parameters chosen so as to have the right sound velocity, and with the effective mass m* = 1.71m, a good agreement with experiments is achieved. The momentum dependence of m* and the appearance of a particlelike mode in addition to a phononlike mode in the excitation spectrum are discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
