The Berry phase for a threefold degenerate state
- 7 October 1991
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 24 (19) , 4495-4509
- https://doi.org/10.1088/0305-4470/24/19/014
Abstract
Different expressions for calculating the Berry phase of adiabatic processes are reviewed and their limitations are discussed. These expressions are then applied to the case of a circuit surrounding a triple degeneracy. It is shown that the most general formula for the Berry phase requires the use of the full SU(3) invariance group of a T state coupled to in + tau 1+ tau 2 modes. The T*( in + tau 2) Jahn-Teller problem appears as a special case with SO(3) symmetry.Keywords
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