Abstract
The magnitude of tunneling splitting, , that governs decoherence in quantum systems under symmetric potentials, is frequently unknown. Using first-principles calculations, we have obtained for a number of Jahn-Teller impurities in solids. Calculated values span 6 orders of magnitude on passing from to . Values associated with - and -doped MgO are 2 orders of magnitude larger than those previously assumed and consistent with the existence of a dynamic Jahn-Teller effect. The origin and enhancement with pressure of these high values is discussed in detail.
- Received 31 July 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.035901
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