Berry's phase for coherent states
Subhash Chandra Chaturvedi, M. S. Sriram, Venkatraman Srinivasan · Journal of Physics A Mathematical and General · 1987
The authors calculate Berry's phase and the Hannay angle for some physically interesting coherent states with the parameters characterising the coherent states taken to be slowly varying. Interestingly, they find that the harmonic oscillator coherent states provide an example for which, although the Hannay angle is zero, Berry's phase is non-zero.