Abstract
The band effective mass of the positron in sodium is computed by the standard method of Wigner, Seitz, and Bardeen. The result is , where is the free-particle mass. Combining it with the results of the many-body calculations of the effective mass of a positron interacting with a Fermi sea of electrons, one can conclude that the theoretical value is much smaller than the experimentally observed effective mass.
- Received 8 April 1966
DOI:https://doi.org/10.1103/PhysRev.149.406
©1966 American Physical Society