Excitation spectrum in quadrupolar systems
- 15 February 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 17 (4) , 1679-1691
- https://doi.org/10.1103/physrevb.17.1679
Abstract
The static and dynamic properties of an isotropic quadrupolar system are studied by the method of double-time Green's functions. Using symmetrized equations of motion, a Dyson equation for the single-particle Green's function is obtained. The self-energy is expressed in terms of three-particle Green's functions, which are determined using an effective Hamiltonian, with the exact commutation relations approximated by quasiboson ones. A detailed expression for the lifetime of the elementary excitations is obtained.Keywords
This publication has 43 references indexed in Scilit:
- Interactions between Molecules in Solid HydrogenPhysical Review B, 1970
- Crystal-Structure Changes in Hydrogen and DeuteriumPhysical Review B, 1968
- Orientational Order in Solid Ortho-Hydrogen. I. Cubic Close-Packed Molecular LatticePhysical Review B, 1967
- Ground State Energy Difference of Hcp and Fcc Ortho-HydrogensProgress of Theoretical Physics, 1967
- Hexagonal-to-Cubic Transition in HydrogenPhysical Review Letters, 1966
- Structure of the Ordered State of Ortho-Hydrogen at Absolute ZeroPhysical Review Letters, 1965
- Change in the Crystal Structure of Solid Normal Hydrogen Near 1.5°KPhysical Review Letters, 1965
- Quadrupole Interaction in CrystalsProgress of Theoretical Physics, 1963
- Quadrupole Interaction in CrystalsProgress of Theoretical Physics, 1960
- On the Quenching of Molecular Rotation of Ortho-Hydrogen in Solid StateProgress of Theoretical Physics, 1955